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Full Discussion: ksh while read loop breaks after one record - AIX
Top Forums Shell Programming and Scripting ksh while read loop breaks after one record - AIX Post 302866105 by port43 on Monday 21st of October 2013 09:34:18 AM
Old 10-21-2013
ksh while read loop breaks after one record - AIX
Code:
#!/bin/ksh
for SRV in imawasp01 \
imawasp02 \
imawasp03 \
imawasp04 \
imawasp05 \
imawasp06 \
imawasp07 \
imawasp08 \
imawasp09
do
  print "${SRV}"
  while read PASSLINE
  do
      SRVNAME=`echo ${PASSLINE} | awk -F\: '{print $1}'`
      LASTLOGIN=`ssh ${SRV} lsuser ${SRVNAME} | tr ' ' '\n' | awk -F= '$1 ~ /time_last_login/ {print $2}'`
      LASTFAILEDLOGIN=`ssh ${SRV} lsuser ${SRVNAME} | tr ' ' '\n' | awk -F= '$1 ~ /time_last_unsuccessful_login/ {print $2}'`
      echo "${SRVNAME},${LASTLOGIN},${LASTFAILEDLOGIN}" >> /tmp/${SRV}_logintimes.txt
  done < ${SRV}_passwd.txt
  print "=================="
done

Code:
${SRV}_passwd.txt

is a local copy of /etc/password file from each server SRV

Setting LASTLOGIN or LASTFAILEDLOGIN causes that inner do loop to break out to the next server after reading just the first line from the password file. If I comment out those two lines the do loop will cycle for every line in the password file.

I don't understand what is causing this behavior.

Thank you for your help.
 

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LEARN ABOUT V7

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)
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