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Full Discussion: "Odd" behavior exiting shell script
Top Forums Shell Programming and Scripting "Odd" behavior exiting shell script Post 302403437 by DreamWarrior on Friday 12th of March 2010 01:27:06 PM
Old 03-12-2010
"Odd" behavior exiting shell script
Is it normal behavior for a shell script that terminates to terminate its parent shell when executed with the "." option?

For example, if I have the example script (we'll name it ex.sh):

Code:
#!/bin/sh
if [ $# -ne 1 ]
then
  echo "Bye."
  exit 2
fi

And I execute it like this:

Code:
>./ex.sh

It says "Bye." and then returns me to my terminal. If however, I execute it like this:

Code:
>. ./ex.sh

It acts the same as above, but my terminal session is terminated after it exits. Is this normal? If so, can I avoid it? It does not seem to matter what the exit status is.... The real script will be setting environment variables that the calling environment will need, so I need the affect of ". ./ex.sh" without the ill effect of terminating the calling shell if it fails for some reason (I want the caller to see the failure and act accordingly).

For what it's worth, the caller will be (.profile) which is why this is very undesirable, becasue if it fails then the user will never see why and never be able to log in (unless they su without the profile executing). Not good....

O/S is AIX 5.3 btw.
 

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LEARN ABOUT X11R4

profile

profile(4)                                                         File Formats                                                         profile(4)

NAME

       profile - setting up an environment for user at login time

SYNOPSIS

       /etc/profile

       $HOME/.profile

DESCRIPTION

       All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence.

       /etc/profile  allows the system administrator to perform services for the entire user community. Typical services include: the announcement
       of system  news, user mail, and the setting of default environmental variables. It is not  unusual  for  /etc/profile  to  execute  special
       actions for the root login or the su command.

       The  file  $HOME/.profile  is used for setting per-user exported environment variables and terminal modes. The following example is typical
       (except for the comments):

              # Make some environment variables global
              export MAIL PATH TERM
              # Set file creation mask
              umask 022
              # Tell me when new mail comes in
              MAIL=/var/mail/$LOGNAME
              # Add my /usr/usr/bin directory to the shell search sequence
              PATH=$PATH:$HOME/bin
              # Set terminal type
              TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid
              while :
              do
                      if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ]
                   then break
                      elif [ -f /usr/share/lib/terminfo/?/$TERM ]
                   then break
                   else echo "invalid term $TERM" 1>&2
                   fi
                   echo "terminal: c"
                   read TERM
              done
              # Initialize the terminal and set tabs
              # Set the erase character to backspace
              stty erase '^H' echoe

FILES

       $HOME/.profile          user-specific environment

       /etc/profile            system-wide environment

SEE ALSO

       env(1), login(1), mail(1), sh(1), stty(1),  tput(1), su(1M), terminfo(4), environ(5), term(5)

       Solaris Advanced User's Guide

NOTES

       Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better  for  serving  all  but  the  most
       global needs.

SunOS 5.10                                                          20 Dec 1992                                                         profile(4)
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