a2p
accept
access
acct
addftinfo
addr2line
adjtime
afmtodit
after
aio_cancel
aio_error
aio_read
aio_return
aio_suspend
aio_waitcomplete
aio_write
alias
aliases
alloc
anvil
append
apply
apropos
ar
array
as
asa
asn1parse
at
atq
atrm
attemptckalloc
attemptckrealloc
authlib
authtest
autopoint
awk
b64decode
b64encode
basename
batch
bc
bdes
bell
bg
bgerror
biff
big5
binary
bind
bindkey
bindtags
bindtextdomain
bio
bitmap
blowfish
bn
bootparams
bootptab
bounce
brandelf
break
breaksw
brk
bsdiff
bsdtar
bsnmpd
bspatch
bthost
btsockstat
buffer
builtin
builtins
bunzip2
button
byacc
bzcat
bzegrep
bzfgrep
bzgrep
bzip2
c2ph
c89
c99
ca
cal
calendar
canvas
cap_mkdb
case
cat
catch
catman
cc
cd
cdcontrol
chdir
checkbutton
checknr
chflags
chfn
chgrp
chio
chkey
chmod
chown
chpass
chroot
chsh
ci
ciphers
ckalloc
ckdist
ckfree
ckrealloc
cksum
cleanup
clear
clipboard
clock
clock_getres
clock_gettime
clock_settime
close
cmp
co
col
colcrt
colldef
colors
colrm
column
comm
command
compile_et
complete
compress
concat
config
connect
console
continue
core
courierlogger
couriertcpd
cp
cpan
cpio
cpp
creat
crl
crontab
crunchgen
crunchide
crypt
crypto
csh
csplit
ctags
ctm
ctm_dequeue
ctm_rmail
ctm_smail
cu
cursor
cursors
cut
cvs
date
dbiprof
dbiproxy
dc
dcgettext
dcngettext
dd
dde
default
defer
deliverquota
des
destroy
devfs
df
dgettext
dgst
dh
dhparam
dialog
diff
diff3
dig
dir
dirent
dirname
dirs
discard
disktab
dngettext
do
domainname
done
dprofpp
dsa
dsaparam
dtmfdecode
du
dup
dup2
eaccess
ec
ecdsa
echo
echotc
ecparam
ed
edit
editrc
ee
egrep
elf
elfdump
elif
else
enc
enc2xs
encoding
end
endif
endsw
engine
enigma
entry
env
envsubst
eof
eqn
err
errno
error
errstr
esac
ethers
euc
eui64
eval
event
evp
ex
exec
execve
exit
expand
export
exports
expr
extattr
extattr_delete_fd
extattr_delete_file
extattr_get_fd
extattr_get_file
extattr_set_fd
extattr_set_file
f77
false
famm
famx
fblocked
fbtab
fc
fchdir
fchflags
fchmod
fchown
fcntl
fconfigure
fcopy
fdescfs
fdformat
fdread
fdwrite
fetch
fg
fgrep
fhopen
fhstat
fhstatfs
fi
file
file2c
fileevent
filename
filetest
find
find2perl
finger
flex
flock
flush
fmt
focus
fold
font
fontedit
for
foreach
fork
format
forward
fpathconf
frame
from
fs
fstab
fstat
fstatfs
fsync
ftp
ftpchroot
ftpusers
ftruncate
futimes
g711conv
gb2312
gb18030
gbk
gcc
gcore
gcov
gdb
gencat
gendsa
genrsa
gensnmptree
getconf
getdents
getdirentries
getdtablesize
getegid
geteuid
getfacl
getfh
getfsstat
getgid
getgroups
getitimer
getlogin
getopt
getopts
getpeername
getpgid
getpgrp
getpid
getppid
getpriority
getresgid
getresuid
getrlimit
getrusage
gets
getsid
getsockname
getsockopt
gettext
gettextize
gettimeofday
gettytab
getuid
glob
global
gmake
goto
gperf
gprof
grab
grep
grid
grn
grodvi
groff
groff_font
groff_out
groff_tmac
grog
grolbp
grolj4
grops
grotty
group
groups
gunzip
gzcat
gzexe
gzip
h2ph
h2xs
hash
hashstat
hd
head
help2man
hesinfo
hexdump
history
host
hostname
hosts
hosts_access
hosts_options
hpftodit
http
hup
i386_get_ioperm
i386_get_ldt
i386_set_ioperm
i386_set_ldt
i386_vm86
iconv
id
ident
idprio
if
ifnames253
ifnames259
image
imapd
incr
indent
indxbib
info
infokey
inode
install
instmodsh
interp
intro
introduction
ioctl
ipcrm
ipcs
ipf
ipftest
ipnat
ippool
ipresend
issetugid
jail
jail_attach
jobid
jobs
join
jot
kbdcontrol
kbdmap
kcon
kdestroy
kdump
kenv
kevent
keycap
keylogin
keylogout
keymap
keysyms
kgdb
kill
killall
killpg
kinit
kldfind
kldfirstmod
kldload
kldnext
kldstat
kldsym
kldunload
klist
kpasswd
kqueue
kse
kse_create
kse_exit
kse_release
kse_switchin
kse_thr_interrupt
kse_wakeup
ktrace
label
labelframe
lam
lappend
last
lastcomm
lastlog
lchflags
lchmod
lchown
ld
ldap
ldapadd
ldapcompare
ldapdelete
ldapmodify
ldapmodrdn
ldappasswd
ldapsearch
ldapwhoami
ldd
leave
less
lesskey
lex
lgetfh
lhash
libnetcfg
library
limit
limits
lindex
link
linprocfs
linsert
lint
lio_listio
list
listbox
listen
lj4_font
lkbib
llength
lmtp
ln
load
loadfont
local
locale
locate
lock
lockf
log
logger
login
logins
logname
logout
look
lookbib
lorder
lower
lp
lpq
lpr
lprm
lptest
lrange
lreplace
ls
lsearch
lseek
lset
lsort
lstat
lsvfs
lutimes
lynx
m4
madvise
magic
mail
maildiracl
maildirkw
maildirmake
mailq
mailx
make
makeinfo
makewhatis
man
manpath
master
mc
mcedit
mcview
md2
md4
md5
mdc2
memory
menu
menubar
menubutton
merge
mesg
message
mincore
minherit
minigzip
mkdep
mkdir
mkfifo
mkimapdcert
mklocale
mknod
mkpop3dcert
mkstr
mktemp
mlock
mlockall
mmap
mmroff
modfind
modfnext
modnext
modstat
moduli
more
motd
mount
mprotect
mptable
msdos
msdosfs
msgattrib
msgcat
msgcmp
msgcomm
msgconv
msgen
msgexec
msgfilter
msgfmt
msggrep
msginit
msgmerge
msgs
msgunfmt
msguniq
mskanji
msql2mysql
msync
mt
munlock
munlockall
munmap
mv
myisamchk
myisamlog
myisampack
mysql
mysqlaccess
mysqladmin
mysqlbinlog
mysqlcheck
mysqld
mysqldump
mysqld_multi
mysqld_safe
mysqlhotcopy
mysqlimport
mysqlshow
mysql_config
mysql_fix_privilege_tables
mysql_zap
namespace
nanosleep
nawk
nc
ncal
ncplist
ncplogin
ncplogout
neqn
netconfig
netgroup
netid
netstat
networks
newaliases
newgrp
nex
nfsstat
nfssvc
ngettext
nice
nl
nm
nmount
nohup
nologin
notify
nroff
nseq
nslookup
ntp_adjtime
ntp_gettime
nvi
nview
objcopy
objdump
objformat
ocsp
od
onintr
open
openssl
opieaccess
opieinfo
opiekey
opiekeys
opiepasswd
option
options
oqmgr
pack
package
packagens
pagesize
palette
pam_auth
panedwindow
parray
passwd
paste
patch
pathchk
pathconf
pawd
pax
pbm
pcre
pcreapi
pcrebuild
pcrecallout
pcrecompat
pcrecpp
pcregrep
pcrematching
pcrepartial
pcrepattern
pcreperform
pcreposix
pcreprecompile
pcresample
pcretest
perl
perl56delta
perl58delta
perl561delta
perl570delta
perl571delta
perl572delta
perl573delta
perl581delta
perl582delta
perl583delta
perl584delta
perl585delta
perl586delta
perl587delta
perl588delta
perl5004delta
perl5005delta
perlaix
perlamiga
perlapi
perlapio
perlapollo
perlartistic
perlbeos
perlbook
perlboot
perlbot
perlbs2000
perlbug
perlcall
perlcc
perlce
perlcheat
perlclib
perlcn
perlcompile
perlcygwin
perldata
perldbmfilter
perldebguts
perldebtut
perldebug
perldelta
perldgux
perldiag
perldoc
perldos
perldsc
perlebcdic
perlembed
perlepoc
perlfaq
perlfaq1
perlfaq2
perlfaq3
perlfaq4
perlfaq5
perlfaq6
perlfaq7
perlfaq8
perlfaq9
perlfilter
perlfork
perlform
perlfreebsd
perlfunc
perlglossary
perlgpl
perlguts
perlhack
perlhist
perlhpux
perlhurd
perlintern
perlintro
perliol
perlipc
perlirix
perlivp
perljp
perlko
perllexwarn
perllinux
perllocale
perllol
perlmachten
perlmacos
perlmacosx
perlmint
perlmod
perlmodinstall
perlmodlib
perlmodstyle
perlmpeix
perlnetware
perlnewmod
perlnumber
perlobj
perlop
perlopenbsd
perlopentut
perlos2
perlos390
perlos400
perlothrtut
perlpacktut
perlplan9
perlpod
perlpodspec
perlport
perlqnx
perlre
perlref
perlreftut
perlrequick
perlreref
perlretut
perlrun
perlsec
perlsolaris
perlstyle
perlsub
perlsyn
perlthrtut
perltie
perltoc
perltodo
perltooc
perltoot
perltrap
perltru64
perltw
perlunicode
perluniintro
perlutil
perluts
perlvar
perlvmesa
perlvms
perlvos
perlwin32
perlxs
perlxstut
perror
pfbtops
pftp
pgrep
phones
photo
pic
pickup
piconv
pid
pipe
pkcs7
pkcs8
pkcs12
pkg_add
pkg_check
pkg_create
pkg_delete
pkg_info
pkg_sign
pkg_version
pkill
pl2pm
place
pod2html
pod2latex
pod2man
pod2text
pod2usage
podchecker
podselect
poll
popd
popup
posix_madvise
postalias
postcat
postconf
postdrop
postfix
postkick
postlock
postlog
postmap
postqueue
postsuper
pr
pread
preadv
printcap
printenv
printf
proc
procfs
profil
protocols
prove
proxymap
ps
psed
psroff
pstruct
ptrace
publickey
pushd
puts
pwd
pwrite
pwritev
qmgr
qmqpd
quota
quotactl
radiobutton
raise
rand
ranlib
rcp
rcs
rcsclean
rcsdiff
rcsfile
rcsfreeze
rcsintro
rcsmerge
read
readelf
readlink
readonly
readv
realpath
reboot
recv
recvfrom
recvmsg
red
ree
refer
regexp
registry
regsub
rehash
remote
rename
repeat
replace
req
reset
resolver
resource
return
rev
revoke
rfcomm_sppd
rfork
rhosts
ripemd
ripemd160
rlog
rlogin
rm
rmd160
rmdir
rpc
rpcgen
rs
rsa
rsautl
rsh
rtld
rtprio
rup
ruptime
rusers
rwall
rwho
s2p
safe
sasl
sasldblistusers2
saslpasswd2
sbrk
scache
scale
scan
sched
sched_getparam
sched_getscheduler
sched_get_priority_max
sched_get_priority_min
sched_rr_get_interval
sched_setparam
sched_setscheduler
sched_yield
scon
scp
script
scrollbar
sdiff
sed
seek
select
selection
semctl
semget
semop
send
sendbug
sendfile
sendmail
sendmsg
sendto
services
sess_id
set
setegid
setenv
seteuid
setfacl
setgid
setgroups
setitimer
setlogin
setpgid
setpgrp
setpriority
setregid
setresgid
setresuid
setreuid
setrlimit
setsid
setsockopt
settc
settimeofday
setty
setuid
setvar
sftp
sh
sha
sha1
sha256
shar
shells
shift
shmat
shmctl
shmdt
shmget
showq
shutdown
sigaction
sigaltstack
sigblock
sigmask
sigpause
sigpending
sigprocmask
sigreturn
sigsetmask
sigstack
sigsuspend
sigvec
sigwait
size
slapadd
slapcat
slapd
slapdn
slapindex
slappasswd
slaptest
sleep
slogin
slurpd
smbutil
smime
smtp
smtpd
socket
socketpair
sockstat
soelim
sort
source
spawn
speed
spinbox
spkac
splain
split
squid
squid_ldap_auth
squid_ldap_group
squid_unix_group
sscop
ssh
sshd_config
ssh_config
stab
startslip
stat
statfs
stop
string
strings
strip
stty
su
subst
sum
suspend
swapoff
swapon
switch
symlink
sync
sysarch
syscall
sysconftool
sysconftoolcheck
systat
s_client
s_server
s_time
tabs
tail
talk
tar
tbl
tclsh
tcltest
tclvars
tcopy
tcpdump
tcpslice
tcsh
tee
tell
telltc
telnet
term
termcap
terminfo
test
texindex
texinfo
text
textdomain
tfmtodit
tftp
then
threads
time
tip
tk
tkerror
tkvars
tkwait
tlsmgr
tmac
top
toplevel
touch
tput
tr
trace
trafshow
trap
troff
true
truncate
truss
tset
tsort
tty
ttys
type
tzfile
ui
ul
ulimit
umask
unalias
uname
uncomplete
uncompress
undelete
unexpand
unhash
unifdef
unifdefall
uniq
units
unknown
unlimit
unlink
unmount
unset
unsetenv
until
unvis
update
uplevel
uptime
upvar
usbhidaction
usbhidctl
users
utf8
utimes
utmp
utrace
uudecode
uuencode
uuidgen
vacation
variable
verify
version
vfork
vgrind
vgrindefs
vi
vidcontrol
vidfont
view
virtual
vis
vt220keys
vwait
w
wait
wait3
wait4
waitpid
wall
wc
wget
what
whatis
where
whereis
which
while
who
whoami
whois
window
winfo
wish
wm
write
writev
wtmp
x509
xargs
xgettext
xmlwf
xstr
xsubpp
yacc
yes
ypcat
ypchfn
ypchpass
ypchsh
ypmatch
yppasswd
ypwhich
yyfix
zcat
zcmp
zdiff
zegrep
zfgrep
zforce
zgrep
zmore
znew
_exit
__syscall
 
FreeBSD/Linux/UNIX General Commands Manual
Hypertext Man Pages
tclvars
 
tclvars(n)		     Tcl Built-In Commands		    tclvars(n)



NAME
       tclvars - Variables used by Tcl


DESCRIPTION
       The following global variables are created and managed automatically by
       the Tcl library.  Except where noted below, these variables should nor-
       mally  be  treated  as  read-only  by  application-specific code and by
       users.

       env    This variable is maintained by Tcl as an	array  whose  elements
	      are  the environment variables for the process.  Reading an ele-
	      ment will return the  value  of  the  corresponding  environment
	      variable.   Setting an element of the array will modify the cor-
	      responding environment variable  or  create  a  new  one	if  it
	      doesn't  already exist.  Unsetting an element of env will remove
	      the corresponding environment  variable.	 Changes  to  the  env
	      array will affect the environment passed to children by commands
	      like exec.  If the entire env array is unset then Tcl will  stop
	      monitoring  env  accesses  and will not update environment vari-
	      ables.
	      Under Windows, the environment variables PATH and COMSPEC in any
	      capitalization  are  converted automatically to upper case.  For
	      instance, the PATH variable could be exported by	the  operating
	      system  as ``path'', ``Path'', ``PaTh'', etc., causing otherwise
	      simple Tcl code to have to  support  many  special  cases.   All
	      other  environment  variables  inherited by Tcl are left unmodi-
	      fied.  Setting an env array variable to blank  is  the  same  as
	      unsetting  it  as this is the behavior of the underlying Windows
	      OS.  It should be noted that relying on an  existing  and  empty
	      environment  variable  won't  work on windows and is discouraged
	      for cross-platform usage.
	      On the Macintosh, the environment variable is constructed by Tcl
	      as no global environment variable exists.  The environment vari-
	      ables that are created for Tcl include:

	      LOGIN  This holds the Chooser name of the Macintosh.

	      USER   This also holds the Chooser name of the Macintosh.

	      SYS_FOLDER
		     The path to the system directory.

	      APPLE_M_FOLDER
		     The path to the Apple Menu directory.

	      CP_FOLDER
		     The path to the control panels directory.

	      DESK_FOLDER
		     The path to the desk top directory.

	      EXT_FOLDER
		     The path to the system extensions directory.

	      PREF_FOLDER
		     The path to the preferences directory.

	      PRINT_MON_FOLDER
		     The path to the print monitor directory.

	      SHARED_TRASH_FOLDER
		     The path to the network trash directory.

	      TRASH_FOLDER
		     The path to the trash directory.

	      START_UP_FOLDER
		     The path to the start up directory.

	      HOME   The path to the application's default directory.

	      You can also create your own environment variables for the  Mac-
	      intosh.	A  file named  Tcl Environment Variables may be placed
	      in the preferences folder in the Mac system folder.   Each  line
	      of this file should be of the form VAR_NAME=var_data.

	      The  last  alternative  is  to  place environment variables in a
	      'STR#' resource named Tcl Environment Variables of the  applica-
	      tion.  This is considered a little more ``Mac like'' than a Unix
	      style Environment Variable  file.   Each	entry  in  the	'STR#'
	      resource	has  the  same	format as above.  The source code file
	      tclMacEnv.c contains the implementation of the  env  mechanisms.
	      This  file  contains  many #define's that allow customization of
	      the env mechanisms to fit your applications needs.

       errorCode
	      After an error has occurred, this variable will be set  to  hold
	      additional information about the error in a form that is easy to
	      process with programs.  errorCode consists of a  Tcl  list  with
	      one  or more elements.  The first element of the list identifies
	      a general class of errors, and determines the format of the rest
	      of  the  list.   The following formats for errorCode are used by
	      the Tcl core; individual applications may define additional for-
	      mats.

	      ARITH code msg
		     This format is used when an arithmetic error occurs (e.g.
		     an attempt to divide by zero in the expr command).   Code
		     identifies  the  precise  error and msg provides a human-
		     readable description of the error.  Code will  be	either
		     DIVZERO (for an attempt to divide by zero), DOMAIN (if an
		     argument is outside the domain of	a  function,  such  as
		     acos(-3)),  IOVERFLOW  (for  integer  overflow), OVERFLOW
		     (for a floating-point overflow), or UNKNOWN (if the cause
		     of the error cannot be determined).

	      CHILDKILLED pid sigName msg
		     This  format is used when a child process has been killed
		     because of a signal.  The	second	element  of  errorCode
		     will be the process's identifier (in decimal).  The third
		     element will be the symbolic  name  of  the  signal  that
		     caused  the  process  to terminate; it will be one of the
		     names from the include file signal.h,  such  as  SIGPIPE.
		     The fourth element will be a short human-readable message
		     describing the signal, such as ``write on	pipe  with  no
		     readers'' for SIGPIPE.

	      CHILDSTATUS pid code
		     This  format is used when a child process has exited with
		     a non-zero exit status.  The second element of  errorCode
		     will  be  the  process's  identifier (in decimal) and the
		     third element will be  the  exit  code  returned  by  the
		     process (also in decimal).

	      CHILDSUSP pid sigName msg
		     This  format  is  used when a child process has been sus-
		     pended because of a signal.  The second element of error-
		     Code  will  be the process's identifier, in decimal.  The
		     third element will be the symbolic  name  of  the	signal
		     that  caused  the process to suspend; this will be one of
		     the names from the include file signal.h, such  as  SIGT-
		     TIN.   The  fourth element will be a short human-readable
		     message describing the signal, such as  ``background  tty
		     read'' for SIGTTIN.

	      NONE   This format is used for errors where no additional infor-
		     mation is available for  an  error  besides  the  message
		     returned  with  the error.  In these cases errorCode will
		     consist of a list containing a single element whose  con-
		     tents are NONE.

	      POSIX errName msg
		     If  the  first  element  of  errorCode is POSIX, then the
		     error occurred during a POSIX kernel  call.   The	second
		     element of the list will contain the symbolic name of the
		     error that occurred, such as ENOENT; this will be one  of
		     the  values  defined  in  the  include file errno.h.  The
		     third element of the list will be a  human-readable  mes-
		     sage  corresponding to errName, such as ``no such file or
		     directory'' for the ENOENT case.

	      To set errorCode, applications  should  use  library  procedures
	      such  as Tcl_SetErrorCode and Tcl_PosixError, or they may invoke
	      the error command.  If one of these methods  hasn't  been  used,
	      then  the  Tcl interpreter will reset the variable to NONE after
	      the next error.

       errorInfo
	      After an error has occurred, this string	will  contain  one  or
	      more lines identifying the Tcl commands and procedures that were
	      being executed when the most recent error  occurred.   Its  con-
	      tents  take the form of a stack trace showing the various nested
	      Tcl commands that had been invoked at the time of the error.

       tcl_library
	      This variable holds the name of a directory containing the  sys-
	      tem library of Tcl scripts, such as those used for auto-loading.
	      The value of this variable is returned by the info library  com-
	      mand.   See  the library manual entry for details of the facili-
	      ties provided by the Tcl script library.	Normally each applica-
	      tion  or	package  will have its own application-specific script
	      library in addition to the Tcl script library; each  application
	      should  set  a  global  variable	with  a name like $app_library
	      (where app is the application's name) to hold the  network  file
	      name  for  that  application's  library  directory.  The initial
	      value of tcl_library is set when an interpreter  is  created  by
	      searching  several different directories until one is found that
	      contains an appropriate Tcl startup script.  If the  TCL_LIBRARY
	      environment  variable  exists,  then  the  directory it names is
	      checked first.  If TCL_LIBRARY isn't set or doesn't refer to  an
	      appropriate directory, then Tcl checks several other directories
	      based on a compiled-in default location,	the  location  of  the
	      binary  containing  the  application,  and  the  current working
	      directory.

       tcl_patchLevel
	      When an interpreter is created Tcl initializes this variable  to
	      hold  a  string  giving the current patch level for Tcl, such as
	      7.3p2 for Tcl 7.3 with the first two official patches, or  7.4b4
	      for the fourth beta release of Tcl 7.4.  The value of this vari-
	      able is returned by the info patchlevel command.

       tcl_pkgPath
	      This variable holds a list of directories indicating where pack-
	      ages  are  normally  installed.	It is not used on Windows.  It
	      typically contains either one or two entries; if it contains two
	      entries,	the  first is normally a directory for platform-depen-
	      dent packages (e.g., shared library binaries) and the second  is
	      normally	a  directory  for platform-independent packages (e.g.,
	      script files). Typically a package is installed as  a  subdirec-
	      tory  of	one of the entries in $tcl_pkgPath. The directories in
	      $tcl_pkgPath are included by default in the auto_path  variable,
	      so  they	and  their  immediate subdirectories are automatically
	      searched for packages during package  require  commands.	 Note:
	      tcl_pkgPath  it  not intended to be modified by the application.
	      Its value is added to auto_path at startup; changes to  tcl_pkg-
	      Path  are not reflected in auto_path.  If you want Tcl to search
	      additional directories for packages you should add the names  of
	      those directories to auto_path, not tcl_pkgPath.

       tcl_platform
	      This  is an associative array whose elements contain information
	      about the platform on which the application is running, such  as
	      the  name  of  the operating system, its current release number,
	      and the machine's instruction set.  The  elements  listed  below
	      will  always be defined, but they may have empty strings as val-
	      ues if Tcl couldn't retrieve any relevant information.  In addi-
	      tion,  extensions  and applications may add additional values to
	      the array.  The predefined elements are:

	      byteOrder
		     The native byte order of this machine:  either  littleEn-
		     dian or bigEndian.

	      debug  If  this  variable  exists, then the interpreter was com-
		     piled with and linked  to	a  debug-enabled  C  run-time.
		     This  variable  will  only exist on Windows, so extension
		     writers can specify which package to  load  depending  on
		     the  C  run-time  library that is in use.	This is not an
		     indication that this core contains symbols.

	      machine
		     The instruction set executed by  this  machine,  such  as
		     intel, PPC, 68k, or sun4m.  On UNIX machines, this is the
		     value returned by uname -m.

	      os     The name of the operating system running on this machine,
		     such as Windows 95, Windows NT, MacOS, or SunOS.  On UNIX
		     machines, this is the value returned  by  uname  -s.   On
		     Windows  95  and  Windows	98, the value returned will be
		     Windows 95 to provide better backwards  compatibility  to
		     Windows  95;  to  distinguish  between the two, check the
		     osVersion.

	      osVersion
		     The version number for the operating  system  running  on
		     this  machine.   On  UNIX	machines,  this  is  the value
		     returned by uname -r.  On Windows 95, the version will be
		     4.0; on Windows 98, the version will be 4.10.

	      platform
		     Either  windows, macintosh, or unix.  This identifies the
		     general operating environment of the machine.

	      threaded
		     If this variable exists, then the	interpreter  was  com-
		     piled with threads enabled.

	      user   This  identifies  the  current  user  based  on the login
		     information available on the platform.  This  comes  from
		     the USER or LOGNAME environment variable on Unix, and the
		     value from GetUserName on Windows and Macintosh.

	      wordSize
		     This gives the size of the native-machine word  in  bytes
		     (strictly,  it  is  same  as  the	result	of  evaluating
		     sizeof(long) in C.)

       tcl_precision
	      This variable controls the number of  digits  to	generate  when
	      converting floating-point values to strings.  It defaults to 12.
	      17 digits is ``perfect'' for  IEEE  floating-point  in  that  it
	      allows  double-precision	values	to be converted to strings and
	      back to binary with no loss of information.  However,  using  17
	      digits  prevents any rounding, which produces longer, less intu-
	      itive results.  For example, expr 1.4 returns 1.3999999999999999
	      with tcl_precision set to 17, vs. 1.4 if tcl_precision is 12.
	      All  interpreters  in  a	process  share	a single tcl_precision
	      value: changing it in one  interpreter  will  affect  all  other
	      interpreters  as	well.	However,  safe	interpreters  are  not
	      allowed to modify the variable.

       tcl_rcFileName
	      This variable is used during initialization to indicate the name
	      of  a  user-specific startup file.  If it is set by application-
	      specific initialization, then the Tcl startup  code  will  check
	      for  the existence of this file and source it if it exists.  For
	      example, for wish the variable is set to ~/.wishrc for Unix  and
	      ~/wishrc.tcl for Windows.

       tcl_rcRsrcName
	      This  variable  is only used on Macintosh systems.  The variable
	      is used during initialization to indicate the name  of  a  user-
	      specific	TEXT  resource located in the application or extension
	      resource forks.  If it is set by	application-specific  initial-
	      ization,	then the Tcl startup code will check for the existence
	      of this resource and source it if it exists.  For  example,  the
	      Macintosh wish application has the variable is set to tclshrc.

       tcl_traceCompile
	      The  value of this variable can be set to control how much trac-
	      ing information is displayed during  bytecode  compilation.   By
	      default,	tcl_traceCompile  is  zero  and no information is dis-
	      played.  Setting tcl_traceCompile to 1 generates a one-line sum-
	      mary in stdout whenever a procedure or top-level command is com-
	      piled.  Setting it to 2 generates a detailed listing  in	stdout
	      of  the  bytecode instructions emitted during every compilation.
	      This variable is useful in tracking down suspected problems with
	      the  Tcl compiler.  It is also occasionally useful when convert-
	      ing existing code to use Tcl8.0.

       This variable and functionality only  exist  if	TCL_COMPILE_DEBUG  was
       defined during Tcl's compilation.

       tcl_traceExec
	      The  value of this variable can be set to control how much trac-
	      ing information is  displayed  during  bytecode  execution.   By
	      default,	tcl_traceExec is zero and no information is displayed.
	      Setting tcl_traceExec to 1 generates a one-line trace in	stdout
	      on  each	call  to a Tcl procedure.  Setting it to 2 generates a
	      line of output whenever any Tcl command is invoked that contains
	      the name of the command and its arguments.  Setting it to 3 pro-
	      duces a detailed trace showing  the  result  of  executing  each
	      bytecode	instruction.   Note that when tcl_traceExec is 2 or 3,
	      commands such as set and incr that have been  entirely  replaced
	      by  a  sequence of bytecode instructions are not shown.  Setting
	      this variable is useful in tracking down suspected problems with
	      the  bytecode compiler and interpreter.  It is also occasionally
	      useful when converting code to use Tcl8.0.

       This variable and functionality only  exist  if	TCL_COMPILE_DEBUG  was
       defined during Tcl's compilation.

       tcl_wordchars
	      The  value  of this variable is a regular expression that can be
	      set to control what  are	considered  ``word''  characters,  for
	      instances  like  selecting  a word by double-clicking in text in
	      Tk.  It is platform dependent.  On Windows, it defaults  to  \S,
	      meaning  anything  but  a Unicode space character.  Otherwise it
	      defaults to \w, which is any  Unicode  word  character  (number,
	      letter, or underscore).

       tcl_nonwordchars
	      The  value  of this variable is a regular expression that can be
	      set to control what are considered ``non-word'' characters,  for
	      instances  like  selecting  a word by double-clicking in text in
	      Tk.  It is platform dependent.  On Windows, it defaults  to  \s,
	      meaning  any  Unicode space character.  Otherwise it defaults to
	      \W, which is anything but a Unicode word character (number, let-
	      ter, or underscore).

       tcl_version
	      When  an interpreter is created Tcl initializes this variable to
	      hold the version number for this version of Tcl in the form x.y.
	      Changes to x represent major changes with probable incompatibil-
	      ities and changes to y  represent  small	enhancements  and  bug
	      fixes  that  retain  backward  compatibility.  The value of this
	      variable is returned by the info tclversion command.

OTHER GLOBAL VARIABLES
       The following variables are only guaranteed to exist in tclsh and  wish
       executables;  the  Tcl library does not define them itself but many Tcl
       environments do.

       argc  The number of arguments to tclsh or wish.

       argv  Tcl list of arguments to tclsh or wish.

       argv0 The script that tclsh or wish started executing (if it was speci-
	     fied) or otherwise the name by which tclsh or wish was invoked.

       tcl_interactive
	     Contains  1  if tclsh or wish is running interactively (no script
	     was specified and standard input is a  terminal-like  device),  0
	     otherwise.

       The  wish  executably additionally specifies the following global vari-
       able:

       geometry
	     If set, contains the user-supplied geometry specification to  use
	     for the main Tk window.


SEE ALSO
       eval(n), tclsh(1), wish(1)


KEYWORDS
       arithmetic,  bytecode,  compiler, error, environment, POSIX, precision,
       subprocess, variables



Tcl				      8.0			    tclvars(n)
=30284
+240
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