07-30-2008
You can do a conditional inside the trap or something, but the concept of catch / throw is not directly supported, no.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
My problem is this:
I need to have a catch-all for my processes. An example would be, using a trap, in the parent, to catch any non-0 exit or invalid command (a way to catch core dumps would be cool, too) in not only the parent, but it's children and they're children. Not only that, but I also... (7 Replies)
Discussion started by: marc6057
7 Replies
2. Shell Programming and Scripting
I'd like to use "trap" command on my unix machine sunOS 5.7.
But somehow when I do "which trap" command, it's no where to be found.
Any one knows how I can get it installed?
Thanks!! (9 Replies)
Discussion started by: whatisthis
9 Replies
3. Shell Programming and Scripting
Hello all,
I'm hoping to get a little insight from some of the wily veterans amongst you.
I've written a script to check for new outgoing files to our vendors located on our ssl server. It seems to be working ok, but the final question here, will be one of logic, and/or a better way to... (4 Replies)
Discussion started by: mph
4 Replies
4. UNIX for Advanced & Expert Users
Hi
Our problem is knowing:
What is the "best" way of simulating a TRAP for ERR within a function, since we know this will not work directly with ksh93 and aix5. How can we save the error encountered in the function and then deal with it in the calling script?
Thanks! (3 Replies)
Discussion started by: theteeth07
3 Replies
5. Shell Programming and Scripting
Hi All
"Identify the behavior of traps, mechanism to implement traps in the snmp framework"
What does it mean?? Can anybody explain.. Whats this Trap??
Thanx in Advance. (1 Reply)
Discussion started by: jeenat
1 Replies
6. Shell Programming and Scripting
Hi folks,
I have tried to add some trap detection in the below script....this script is used to monitor database activities...in a rather awkward way :rolleyes:....
The idea behind adding trap is that....this script creates lots of temporary files in the running folder to store the count... (1 Reply)
Discussion started by: frozensmilz
1 Replies
7. Shell Programming and Scripting
Hi
At the beginning of my script, i will create a file and at the end of the script i will delete that.
But i got to delete the file even if the process is forcefully killed, or server is rebooted...
I think i can make use of trap signal, but couldnt figure out how and where to use in my... (4 Replies)
Discussion started by: vasuarjula
4 Replies
8. Shell Programming and Scripting
trap "" 1 2 3
Thanks,
-dog (1 Reply)
Discussion started by: landog
1 Replies
9. Homework & Coursework Questions
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
That is the last reply I received from my instructor, and I'm looking for some alternatives.
When using... (2 Replies)
Discussion started by: newuser45
2 Replies
10. Shell Programming and Scripting
Hi Ppl,
Need help
$ cat trap.sh
#!/bin/bash
trap cleanup 1 2 3 15
cleanup()
{
echo “I was running \”$BASH_COMMAND\” when you interrupted me.”
echo “Quitting.”
exit 1
}
while :
do
echo -en “hello. “
sleep 1 (3 Replies)
Discussion started by: heman96
3 Replies
LEARN ABOUT OPENSOLARIS
catch
catch(1T) Tcl Built-In Commands catch(1T)
__________________________________________________________________________________________________________________________________________________
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. The catch command calls the Tcl interpreter recur-
sively to execute 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 the exceptional return code returned by evaluation
of script. Tcl defines the normal return code from script evaluation to be zero(0), or TCL_OK. Tcl also defines four exceptional return
codes: 1 (TCL_ERROR), 2 (TCL_RETURN), 3 (TCL_BREAK), and 4 (TCL_CONTINUE). Errors during evaluation of a script are indicated by a return
code of TCL_ERROR. The other exceptional return codes are returned by the return, break, and continue commands and in other special situa-
tions as documented. Tcl packages can define new commands that return other integer values as return codes as well, and scripts that make
use of the return -code command can also have return codes other than the five defined by Tcl.
If the varName argument is given, then the variable it names is set to the result of the script evaluation. When the return code from the
script is 1 (TCL_ERROR), the value stored in varName is an error message. When the return code from the script is 0 (TCL_OK), the value
stored in resultVarName is the value returned from 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 +- }}
}
SEE ALSO
break(1T), continue(1T), error(1T), return(1T), tclvars(1T)
KEYWORDS
catch, error
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTcl |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tcl is available on http://opensolaris.org.
Tcl 8.0 catch(1T)