Test (=[) is builtin command = not bracket. Usually two mistakes using test command:
variable is empty => no argument => error
no argument separator between arguments - it's commandline, not programlanguage testing with brackets.
Solution: make always string = string length 0 is something = good argument and remember argument delimeters. Ex. in this case test command need 4 arguments: value operator value ]
If you use test command using test (not [ ), then you don't need last argument ].
Yes little funny, but command is exactly the same.
Generic solution for shells (sh, bsh, ksh, bash, zsh, ...): more testing
---------- Post updated at 07:27 PM ---------- Previous update was at 07:23 PM ----------
There are also some other test commands, [[ and ((. Syntax are little different as [ / test.
i keep getting the following error with the code segment below when i try to compile the program.
The code is from 'defs.h'
parse error before '('
parse error before ')'
stray '\' in program
this is the code segment and the error is on the second line of the segment
#define... (1 Reply)
Hi Guys,
I am trying to compare using if, but keep getting some strange results.
if ; then
keeps creating the file 1
if ; then
does not work at all
if ; then
does not work
if ; then
does not work
if ; then
does not work eihter.
I am using a ksh, on Solaris (9 Replies)
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Discussion started by: tekster2
7 Replies
LEARN ABOUT OPENDARWIN
for
for(n) Tcl Built-In Commands for(n)
__________________________________________________________________________________________________________________________________________________NAME
for - ``For'' loop
SYNOPSIS
for start test next body
_________________________________________________________________DESCRIPTION
For is a looping command, similar in structure to the C for statement. The start, next, and body arguments must be Tcl command strings,
and test is an expression string. The for command first invokes the Tcl interpreter to execute start. Then it repeatedly evaluates test
as an expression; if the result is non-zero it invokes the Tcl interpreter on body, then invokes the Tcl interpreter on next, then repeats
the loop. The command terminates when test evaluates to 0. If a continue command is invoked within body then any remaining commands in
the current execution of body are skipped; processing continues by invoking the Tcl interpreter on next, then evaluating test, and so on.
If a break command is invoked within body or next, then the for command will return immediately. The operation of break and continue are
similar to the corresponding statements in C. For returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the for command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
for {set x 0} {$x<10} {incr x} {
puts "x is $x"
}
SEE ALSO
break, continue, foreach, while
KEYWORDS
for, iteration, looping
Tcl for(n)