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Full Discussion: Unable to get $PWD value from script in /etc/init.d
Operating Systems Linux Red Hat Unable to get $PWD value from script in /etc/init.d Post 302632389 by IKE0000 on Monday 30th of April 2012 03:09:50 AM
Old 04-30-2012
Just like Corona688 has said,
"PWD is the directory the program was run from".

So in order to get the directory in which shell b.sh is located, you should first get access to that directory and then run PWD command:
Code:
DIR=$(cd $(dirname "$0"); pwd)

For your purpose, I will recommend you to define the service path in the parent shell which is a.sh and export the service path variable to the sub shell.

Here are the sample code:
Code:
# 
# a.sh
#

# Define the service_path variable and export it, so that $service_path 
# variable will be visible in the sub shell b.sh and c.sh
service_path="/opt/xSystem"
export service_path

cmd="$service_path/b.sh"
case "$1" in
start)
echo "a.sh is starting"
sh $cmd start
;;
stop)
echo "a.sh is stopping"
sh $cmd stop
;;
esac

Code:
#
# b.sh
#

cmd="$service_path/c.sh"
case "$1" in
start)
echo "b.sh is starting from $service_path"
sh $cmd start
;;
stop)
echo "b.sh is stopping from $service_path"
sh $cmd stop
;;
esac

Code:
                                                                             
#
# c.sh
#
case "$1" in
start)
echo "c.sh is starting from $service_path"
;;
stop)
echo "c.sh is stopping from $service_path"
;;
esac

Test:
Code:
service a.sh start
a.sh is starting
b.sh is starting from /opt/xSystem
c.sh is starting from /opt/xSystem

service a.sh stop
a.sh is stopping
b.sh is stopping from /opt/xSystem
c.sh is stopping from /opt/xSystem

Last edited by IKE0000; 04-30-2012 at 04:17 AM.. Reason: typos
 

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LEARN ABOUT CENTOS

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.

       If the init script file does not exist, the script tries to use legacy actions.	If there is no suitable legacy action found and COMMAND is
       one of actions specified in LSB Core Specification, input is redirected to the systemctl.  Otherwise the command fails with return code 2.

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

       chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5)

								     Jan 2006								service(8)
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