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Homework and Emergencies Emergency UNIX and Linux Support Perl script logging via Shell script Post 302441978 by al0x on Thursday 29th of July 2010 05:00:37 AM
Old 07-29-2010
Perl script logging via Shell script

Hello

I wrote a nice Perl script that is intended to find and copy some files when getting a TERM signal. Now I wanted to make a shell script that starts/restarts the Perl script if it crashes/ends because of errors and make a log of all output the Perl Script gives. The problem is that it won't write any output to my logfile Smilie
Here is my Shell script:
Code:
#!/bin/sh

pidcheck=`pidof perl | grep -c [0-9][0-9][0-9][0-9]`
while [ $pidcheck -ne 0 ]
do
        kill -9 `pidof perl`
done
echo "\n------------------------------\n" >> log.txt
date >> log.txt
echo "\n------------------------------\n" >> log.txt
while [ 1 -eq 1 ]
do
        `perl handler.pl >> log.txt`
        echo "Perl-Script crashed, restarting..." >> log.txt
done

I think it would write if I don't put the `` around `perl handler.pl >> log.txt`, but then I can't send any signals to my perl script :/

Can (maybe) someone help me? ^^' thanks in advance and sorry for my bad english Smilie
 

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script(1)						      General Commands Manual							 script(1)

NAME
script - Makes a transcript of terminal session SYNOPSIS
script [-a] [file] The script command makes a transcript of everything printed on your terminal. OPTIONS
Appends the transcript to file rather than writing it to file. OPERANDS
The name of an output file that will contain the transcript of the session. If this parameter is omitted, the file typescript is written. DESCRIPTION
The transcript is written to file, or appended to file if the -a option is given. If no file name is given, the transcript is saved in the file typescript. The script ends when the forked shell exits. This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create an example of a working session this way). If you specify the -a option and the file does not exist, it is created. If you do not specify the -a option and the file exists, it is replaced. RESTRICTIONS
The script command requires a streams based terminal. In single user mode, streams may not be enabled. Under these circumstances, script will exit with no action. If you are the superuser and need to run this command in single user mode, use the following special instruc- tions. Enabling Streams If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams. This command is avail- able to the superuser only. SEE ALSO
Commands: autopush(8), cat(1), echo(1), strsetup(8), tee(1) System Administration script(1)
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