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Full Discussion: Using 'su' inside a loop
Top Forums Shell Programming and Scripting Using 'su' inside a loop Post 302412907 by sugan on Wednesday 14th of April 2010 01:17:49 AM
Old 04-14-2010
Using 'su' inside a loop

Hi,
I am using su within a for loop. As you might expect, it prompts for password during each loop execution. Here is my piece of code:
Code:
for i in $LIST
do
  if [ `echo $i | grep -c 'APSTAGE'` -gt 0 ]
  then
    DATABASE=`echo $i | awk -F "|" '{ print $1 }'`
    USER_ID=`echo $i | awk -F "|" '{ print $2 }'`
    su - apstage -c "echo $i; cd /home/apstage/src/util; . GHD_common.ksh; db_connect -c $DATABASE -u $USER_ID"
  fi
done

I tried to put the loop inside su -c but $LIST, defined in the script is not visible after su gets executed.

How can we provide password automatically during each loop execution. Any idea?
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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