CODEWITHSUNDEEP
apachebashcgi
ZeroErrors
ZeroErrors

Reputation: 71

cgi bash script not waiting for all output of command

I have a cgi script running but I am having issues with the cgi script not waiting for all of the output of the commands.

Here is the cgi script:

#!/bin/bash
echo Content-type: text/plain
echo ""

case "$QUERY_STRING" in
  start)
    service servicename start
    ;;
  stop)
    service servicename stop
    ;;
  restart)
    service servicename restart
    ;;
  backup)
    service servicename backup
    ;;
  checkisup)
    service servicenamet checkisup
    ;;
  status)
    service servicename status
    ;;
  *)
  echo "Usage: $0 {checkisup|start|stop|restart|backup|status|restart}"
  exit 1
  ;;
esac

exit 0

When i call the status with script.cgi?status

it executes the status function form my service

  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    pre_log_len=`wc -l "$PATH/server.log" | awk '{print $1}'`
    echo "$SERVICE is running... executing command"
    as_user "screen -p 0 -S screenname -X eval 'stuff \"$command\"\015'"
    sleep .1
    tail -n $[`wc -l "$PATH/server.log" | awk '{print $1}'`-$pre_log_len] "$PATH/server.log"
  fi

The part i am having the issue with is when the function gets to sleep .1 the cgi script will just continue without waiting for the output of tall.

Any ideas?

Upvotes: 0

Views: 896

Answers (1)

Anew
Anew

Reputation: 5492

You may not be seeing any output from tail because the result of your arithmetic for the -n argument may be 0:

anew@Wintermute:work$ wc -l dev-configuration.json 
     105 dev-configuration.json
anew@Wintermute:work$ tail -n 0 dev-configuration.json 
anew@Wintermute:work$

Upvotes: 1

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