Tcl Tk

Advanced Search

Home

Manuel

Links

Faq

Submit a tcl/tk Reference

Some examples tcl/tk codes Man of Bwidget Man of blt mkwidget screenshots TkOgl Video Demo real.

The source of theses pages is the excellent Tcl/Tk Quick Reference Guide.
I apologize , because there're some tex commands in the text, if you see some error please send me an email

Basic Tcl Language Features

; or newline: statement separator
$ackslash$: statement continuation if last character in line
#: comments out rest of line (if first non$-$whitespace character)
var: simple variable
var(index): associative array variable
var(i,j): multi-dimensional array variable
$var: variable substitution (also ${var}xyz)
[expr 1+2]: command substitution
$ackslash$char: backslash substitution (see below)
"hello $a": quoting with substitution
{hello $a:} quoting with no substitution (deferred substitution)

The only data type in Tcl is a string. However, some commands will interpret arguments as numbers/boolean in which case the formats are quad Integer: 123 0xff (hex) 0377 (octal). quad Floating Point: 2.1 3. 6e4 7.91e+16 quad Boolean: true false 0 1 yes no Tcl makes the following backslash substitutions: $ackslash$a $ackslash$b $ackslash$f $ackslash$n $ackslash$r $ackslash$t $ackslash$v

audible alert (0x7)	$ackslash$space	space
backspace (0x8)	$ackslash$newline	space
form feed (0xC)	$ackslash$ddd	octal value (d=0-7)
newline (0xA)	$ackslash$xdd	hexadecimal value (d=0-9, a-f)
carriage return (0xD)	$ackslash$c	replace `$ackslash$c` with `c`
horizontal tab (0x9)	$ackslash$$ackslash$	a backslash
vertical tab (0xB)

The source of theses pages is the excellent Tcl/Tk Quick Reference Guide.