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Top Forums Shell Programming and Scripting Ping: redirect output and error Post 68002 by mbarberis on Wednesday 30th of March 2005 06:28:18 AM
Old 03-30-2005
Ping: redirect output and error

Hi, I use this function (now modified with elif) for check if a pc is up:
Code:
check_pc() {
 
  $PING $PC 1 2> /dev/null

  if [ $? -eq 0 ]; then
   
    check_dir #Other function
   
    echo "Begin backup operation for $PC"

    echo "$SMBTAR -s $PC -u $USER -p $PASS -x $SHARE$EXCL -t - | gzip -c > $PC.tar.gz"
   
    echo "End backup operation for $PC"
    echo ""    

  elif [ $? -eq 1 ]; then  
     
    echo "Unable to ping $PC"
    echo ""

  else  
    #Not in /etc/hosts
    echo "Unable to find $PC"
    echo ""

  fi

} #end check_pc

But.. With
Code:
$PING $PC 1 2> /dev/null

output like no answer from pc3 don't finish in /dev/null ... If I try
Code:
$PING $PC 1 > /dev/null

don't finish in /dev/null /usr/sbin/ping: unknown host pc123. How redirect error and output in /dev/null?
And.. can I use ping error to write in a log file "Unable to find $PC".. now the last else don't work. I use /bin/sh ... Thanks, bye.
 

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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 5.10 3 Aug 1994 echo(1B)
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