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Full Discussion: Switching user inside a shell script doesn't seem to work
Top Forums Shell Programming and Scripting Switching user inside a shell script doesn't seem to work Post 302894075 by John K on Monday 24th of March 2014 01:06:02 AM
Old 03-24-2014
Switching user inside a shell script doesn't seem to work
Linux version : Oracle Linux 6.4
Shell : Bash

The following script will be run as root. During the execution, it should switch to oracle user and execute few commands.
After googling and searching within unix.com , I came up with the following syntax

## Enclosing all commands in double quotes with the following syntax
Code:
su -l anotheruser -c "command1;command2;command3;..."

## Using single quote like below didn't work for me
Code:
su -l anotheruser -c 'command1;command2;command3;...'

So, I created the following simple script called test.sh and executed it.
But it seems that the switch user using su didn't work properly.
/tmp/who.txt file shows root. It should show orace user if su worked properly.
/tmp/MYVAR2.txt is empty . It should show Duffy
/tmp/Instancename.txt is empty. It should show JUMBO1


Code:
# cat test.sh
#!/bin/bash
#Usage     :  /root/SCRIPTS/test.sh <Argument1>
echo -e "\n"

## Currently you are root user

## su to oracle user and run the following commands which are separated by semi colon

su -l oracle -c "export ORACLE_SID=$11;export MYVAR1=Stomper;export MYVAR2=Duffy; echo `whoami` >/tmp/who.txt;echo $1 >/tmp/Arg_name.txt;echo $ORACLE_SID >/tmp/Instancename.txt;echo $MYVAR2 >/tmp/MYVAR2.txt"

whoami ## Now you should be back as root
#

-- Executing the script
Code:
#
# test.sh JUMBO


root
#

--- Verifying the content of the files
Code:
# cat /tmp/who.txt
root
# cat /tmp/Arg_name.txt
JUMBO
#
#
# cat /tmp/MYVAR2.txt

# cat /tmp/Instancename.txt

#

 

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LEARN ABOUT PHP

pts_source

PTS_SOURCE(1)						       AFS Command Reference						     PTS_SOURCE(1)

NAME

       pts_source - Read pts commands from a file

SYNOPSIS

       pts source [-file] <file name> [-cell] <cell name>
	  [-noauth] [-localauth] [-force]

       pts so [-f] <file name> [-c] <cell name>
	  [-n] [-l] [-f]

DESCRIPTION

       The pts source runs commands from a file as if they were typed in pts interactive mode. The command can be run from the command line or
       interactively.

CAUTIONS

       Prior to OpenAFS 1.4.5 and OpenAFS 1.5.23, the pts source command was only available on Unix or Linux and when OpenAFS was compiled with
       the supergroups option (disabled by default).  As of OpenAFS 1.4.5 and 1.5.23, it is always available.

OPTIONS

       pts source takes the following options:

       -cell <cell name>
	   Names the cell in which to run the command. For more details, see pts(1).

       -force
	   Enables the command to continue executing as far as possible when errors or other problems occur, rather than halting execution at the
	   first error.

       -help
	   Prints the online help for this command. All other valid options are ignored.

       -localauth
	   Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. Do not combine this flag with the -cell or
	   -noauth options. For more details, see pts(1).

       -noauth
	   Assigns the unprivileged identity anonymous to the issuer. For more details, see pts(1).

OUTPUT

       This command shows the output of each command in the file as if it were run normally.

EXAMPLES

       Here is an example of using pts source in a pts interactive session:

	  % echo examine admin > /tmp/commands.txt
	  % pts interactive
	  pts> source /tmp/commands.txt
	  Name: admin, id: 1, owner: system:administrators, creator: anonymous,
	    membership: 2, flags: S----, group quota: 20.
	  pts> quit
	  %

SEE ALSO

       pts(1), pts_interactive(1), pts_quit(1), pts_sleep(1)

COPYRIGHT

       Copyright 2007 Jason Edgecombe <jason@rampaginggeek.com>

       This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Jason Edgecombe for
       OpenAFS.

OpenAFS 							    2014-04-08							     PTS_SOURCE(1)
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