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Full Discussion: Switching user inside a shell script
Top Forums UNIX for Dummies Questions & Answers Switching user inside a shell script Post 302377998 by Scott on Sunday 6th of December 2009 10:03:39 AM
Old 12-06-2009
If you want to run something as another user you either have to have SUDO set up to allow this (by root) or the owner of the other "program" should set the SUID bit.

On many (or maybe all?) systems SUID has no effect with shell scripts.

Code:
$ ls -l Test*
-r-sr-xr-x  1 user2  staff  8800 Dec  6 13:46 TestCProg # C Program
-r-sr-xr-x  1 user2  staff    35 Dec  6 13:19 TestScript # Shell script

$ id user2
uid=502(user2) gid=20(staff)

$ ./TestCProg > /dev/null &; ps -ef | grep TestCProg
[1]	97055
  502 97055 96971   0   0:00.00 ttys000    0:00.00 ./TestCProg
  501 97057 96971   0   0:00.00 ttys000    0:00.00 grep TestCProg

$ ./TestScript &; ps -ef | grep TestScript
[2]	97063
  501 97063 96971   0   0:00.00 ttys000    0:00.00 ./TestScript
  501 97065 96971   0   0:00.00 ttys000    0:00.00 grep TestScript

Another option is to use the Expect tool. This is the first time I've used it, so probably not very good, but...

Code:
/usr/bin/expect << !
spawn su - y
expect "Password:"
send "y_password\r"
send "who am i\r"
send "exit\r"
expect "exit"
!

$ who am i
x        ttys000  Dec  6 15:49
$ ./Test
spawn su - y
Password:
y$ who am i
y        ttys002  Dec  6 15:50 
y$ exit

It should also be possible to use SSH to do what you want, but you'd need to set up the keys the first time
 

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LEARN ABOUT V7

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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