11-14-2009
Variables can be set and exported in /etc/profile.
It's also possible that the users shell is not /bin/sh; if it is Bash, you'd want to look in .bash_profile
In most shells, you can also put variables and functions in a resource file like .bashrc
Or the script may have been meant to be called by another script that exported that variable.
---------- Post updated at 04:57 PM ---------- Previous update was at 04:45 PM ----------
Sorry, I missed "$*"
That's every argument passed to the script. $@ is similar, but that packs the args into one arg.
Specifically in this usage, every argument passed to the FUNCTION.
---------- Post updated at 05:03 PM ---------- Previous update was at 04:57 PM ----------
Finally, that's defining a function, not calling it.
I know this is probably very confusing right now. The particular script may be a little too much to digest at this point, but it will all gel at some point.
Last edited by TonyLawrence; 11-14-2009 at 06:07 PM..
Reason: To vague in spots
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catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________
NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?varName?
_________________________________________________________________
DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. Catch calls the Tcl interpreter recursively to exe-
cute script, and always returns without raising an error, regardless of any errors that might occur while executing script.
If script raises an error, catch will return a non-zero integer value corresponding to one of the exceptional return codes (see tcl.h for
the definitions of code values). If the varName argument is given, then the variable it names is set to the error message from interpret-
ing script.
If script does not raise an error, catch will return 0 (TCL_OK) and set the variable to the value returned from script.
Note that catch catches all exceptions, including those generated by break and continue as well as errors. The only errors that are not
caught are syntax errors found when the script is compiled. This is because the catch command only catches errors during runtime. When
the catch statement is compiled, the script is compiled as well and any syntax errors will generate a Tcl error.
EXAMPLES
The catch command may be used in an if to branch based on the success of a script.
if { [catch {open $someFile w} fid] } {
puts stderr "Could not open $someFile for writing
$fid"
exit 1
}
The catch command will not catch compiled syntax errors. The first time proc foo is called, the body will be compiled and a Tcl error will
be generated.
proc foo {} {
catch {expr {1 +- }}
}
KEYWORDS
catch, error
Tcl 8.0 catch(n)