Re: Catching perl warnings and errors

Errors and warnings (in UNIX, I don't know how this works in Windows) are printed to STDERR (standard error). STDERR is attached to the console by default, so if you want to print errors/warnings somewhere else, you just have to redirect STDERR (filehandle 2):

$ perl -Mstrict -e '$test = "foo"'
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will print

Global symbol "$test" requires explicit package name at -e line 1.
Execution of -e aborted due to compilation errors.
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to the console, but

$ perl -Mstrict -e '$test = "foo"' 2> error.log
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will print the error to file ./error.log. Check your shell's manpage for details on redirecting STDERR.

hope this helps,

Update: as for using syslog to log the errors, I don't know if you can do this, since as far as I can remember, you use a specific system call to do that: syslog(3).

Update #2: a quick question in #debian @ freenode.net and I have something else: check the logger command, which is a "shell command interface to the syslog(3) system log module" (from the manpage).

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Re: Re: Catching perl warnings and errors by hotshot (Prior) on May 26, 2003 at 08:33 UTC
I use perl module Sys::Syslog for sending any messages to syslog, it work great. I only want to catch perl errors (from within my scripts not by redirecting it from the command line)and send them to syslog the same way. Hotshot	[reply]
Re: Re: Re: Catching perl warnings and errors by CukiMnstr (Deacon) on May 26, 2003 at 14:29 UTC
oh. I understood something else from your first post... There are many ways to catch exceptions. You could use `eval()`, but using `eval()` will not work for warnings from the compiler, from the POD: `Beware that using "eval" neither silences perl from printing warnings +to STDERR, nor does it stuff the text of warning messages into $@.` [download] Or you can use Error as nite_man suggests, but I just made a couple of tests and read the docs and compiler warnings don't seem to be handled by it. hope this helps,	[reply] [d/l] [select]