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Full Discussion: explain the code
Top Forums UNIX for Advanced & Expert Users explain the code Post 302288862 by justsam on Wednesday 18th of February 2009 07:18:44 AM
Old 02-18-2009
. ${0%/*}/wrkenv.sh
gets the directory path (as is executed) of the running script and sources the script wrkenv.sh present in the above reslut directory.
If user is running a script as /home/justsam/test.sh , then the first line of the code fetches the directory (/home/justsam in this case and sources the wrkenv.sh script

jobName_sh=${0##*/}
This is meant to remove all characters before the last “/ “from the path entered to invoke the script, leaving only the name of the script.

## matches the longest match from start of the string, and looks for the last occurrence of “/” from beginning, if only # was used it would match the shortest match from start of the string, looking for the first occurrence of “/” from beginning.


jobName=${jobName_sh%.*}
This is meant to remove '.' and all the characters after the '.'
Ex: If jobName_sh in test.sh, then .sh is removed and gives the name of the file without the extension.
justsam
 

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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