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Operating Systems Solaris Special symbols in shell scripting Post 302277929 by Ariean on Sunday 18th of January 2009 10:30:57 PM
Old 01-18-2009
Special symbols in shell scripting

I am new to unix shell scripting, i was going through the existing shell scripts but couldn't able to get enough information on below syntaxes,i mean the symbols $# & $? used in the if loop. what exactly are they? what is the inline meaning, Could you please throw some light.

Examples:

1)
if [ $# -eq 3 ]
then
numFiles=`cat $3 | wc -l | sed 's/ //g'`
#echo $numFiles
count=0

2) if [ $? -eq 0 ]
then
echo "File $line moved to archive on `date +%D`">>$logFile
#echo $'\n' >>$logFile
else
echo "File $line can not be deleted">>$logFile
fi
 

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STOREBACKUPUPDATEBACKUP(1)				User Contributed Perl Documentation				STOREBACKUPUPDATEBACKUP(1)

NAME
storeBackupUpdateBackup.pl - updates / finalizes backups created by storeBackup.pl with option --lateLink, --lateCompress SYNOPSIS
storeBackupUpdateBackup.pl -b backupDirectory [--autorepair] [--print] [--verbose] [--debug] [--lockFile] [--noCompress] [--progressReport number] [--checkOnly] [--logFile [--suppressTime] [-m maxFilelen] [[-n noOfOldFiles] | [--saveLogs]] [--compressWith compressprog]] storeBackupUpdateBackup.pl --interactive --backupDir topLevlDir [--autorepair] [--print] WARNING
!!! USAGE IN PARALLEL WITH storeBackup.pl CAN DESTROY YOUR BACKUPS !!! OPTIONS
--interactive, -i interactive mode for reparing / deleting currupted backups created with option '--lateLinks' --backupDir, -b top level directory of all backups (must exist) --autorepair, -a repair simple inconsistencies automatically without requesting the action --print print configuration read from configuration file and stop --verbose, -v verbose messages --debug, -d generate detailed information about the files with the linking information in it --lockFile, -L lock file, if exist, new instances will finish if an old is already running If set to the same file as in storeBackup it will prevent $prog from running in parallel to storeBackup, default is $lockFile --noCompress maximal number of parallel compress operations, default = chosen automatically --checkOnly -c do not perform any action, only check consistency --progressReport print progress report: after each 'number' files when compressing after each 'number * 1000' files when linking after each 'number * 10000' files when performing chmod --logFile, -l logFile, Default: stdout --suppressTime suppress output of time in logfile --maxFilelen, -m maximal length of log file, default = 1e6 --noOfOldFiles, -n number of old log files, default = 5 --saveLogs save log files with date and time instead of deleting the old (with [-noOldFiles]) --compressWith compress saved log files (e.g. with 'gzip -9'). default is 'bzip2' COPYRIGHT
Copyright (c) 2008,2012 by Heinz-Josef Claes. Published under the GNU General Public License v3 or any later version perl v5.14.2 2012-06-16 STOREBACKUPUPDATEBACKUP(1)
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