03-04-2009
Exit from sourced script
Hello,
I have written a script (say chld.sh). its structure is as follows:
------------------------
#!/bin/sh
usage()
{
echo "chld.sh <param1> <param2>"
exit 0
}
chk_param_1()
{
case $param1 in
c) export PATH=$PATH:/home_a/bin/execs;;
d) export PATH=$PATH:/home_b/bin/execs;;
*) usage;;
esac
}
chk_param_2()
{
echo "Chk Param 2"
}
clear
param1=$1
param2=$2
chk_param_1
chk_param_2
------------------------
Now I source this script, as I want the new PATH variable in my current environment. Hence I give a alias in my environment as
alias set_path='. ~/chld.sh'
Now when I call the script as:
set_path c ........it works fine
set_path d..........also works fine.
But if I give "set_path e"......it displays the usage and EXITS/LOGOUTS from my parent shell i.e. the main shell.
I know the reason is coz due to sourcing, it runs the chld.sh in the current shell and not another subshell.
But please tell me how to do this.
Whenever I display "usage".....i dont want to continue ahead in the script.
Simply come out of this script.
Please HELP!!
Last edited by angad.makkar; 03-04-2009 at 05:49 AM..
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LEARN ABOUT DEBIAN
initscript
INITSCRIPT(5) Linux System Administrator's Manual INITSCRIPT(5)
NAME
initscript - script that executes inittab commands.
SYNOPSIS
/bin/sh /etc/initscript id runlevels action process
DESCRIPTION
When the shell script /etc/initscript is present, init will use it to execute the commands from inittab. This script can be used to set
things like ulimit and umask default values for every process.
EXAMPLES
This is a sample initscript, which might be installed on your system as /etc/initscript.sample.
#
# initscript Executed by init(8) for every program it
# wants to spawn like this:
#
# /bin/sh /etc/initscript <id> <level> <action> <process>
#
# Set umask to safe level, and enable core dumps.
umask 022
ulimit -c 2097151
PATH=/bin:/sbin:/usr/bin:/usr/sbin
export PATH
# Increase the hard file descriptor limit for all processes
# to 8192. The soft limit is still 1024, but any unprivileged
# process can increase its soft limit up to the hard limit
# with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel).
ulimit -Hn 8192
# Execute the program.
eval exec "$4"
NOTES
This script is not meant as startup script for daemons or somesuch. It has nothing to do with a rc.local style script. It's just a handler
for things executed from /etc/inittab. Experimenting with this can make your system un(re)bootable.
FILES
/etc/inittab, /etc/initscript.
AUTHOR
Miquel van Smoorenburg ,<miquels@cistron.nl>
SEE ALSO
init(8), inittab(5).
July 10, 2003 INITSCRIPT(5)