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Script in KSH to check if a process its up or down.

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# 1  
Old 01-23-2012
Script in KSH to check if a process its up or down.
Hi all!

Im working on a simple script in KSH (just started) to check if a process its up or down, but im kind of lost with the following error.

Script:
Code:
#!/usr/bin/ksh

psup=$(ps -ef | grep sftp | egrep -v grep | wc -l)

if ($psup > 0);
then

   echo "Process SFTP running"

else

   echo  "Process SFTP not runnung"

fi

Error:

./checaproceso.sh[11]: 1: not found.
Process SFTP not runnung


Not sure why is reading the variable like that.

Im a beginer at KSH scripting.

Thanks!
# 2  
Old 01-23-2012
Notice the space between operators and operands!
Code:
if [ "$psup" -gt 0 ]
then
...
fi

You can try this also...
Code:
pgrep sftp >/dev/null 2>&1
test $? -ne 0 && echo "Process not running..."

--ahamed
This User Gave Thanks to ahamed101 For This Post:
ARSport
# 3  
Old 01-23-2012
Its working perfectly now thanks a lot, ill put more attention to this kind of details.
# 4  
Old 01-23-2012
The if statement:
Quote:
Originally Posted by ARSport
Code:
if ($psup > 0);

is incorrect. It should have been:
Code:
if [[ $psup -gt 0 ]]

(without the trailing semicolon)

What you did was execute the command "1" (which was the value of the variable psup) in a subshell, sending its output to the file "0".

Have you thought of using pgrep, as in:
Code:
if pgrep sftp
then
  echo "Process SFTP running"
else
  echo  "Process SFTP not running"
fi

# 5  
Old 01-23-2012
I will install pgrep in my server and apply that solution.
# 6  
Old 01-23-2012
Save a process by eliminating the "grep -v grep" and replace that line with this:
Code:
psup=$(ps -ef | grep "[s]ftp" | wc -l)

The regular expression matches the string "sftp" but not itself.

Gary
# 7  
Old 01-23-2012
Thanks Gary!
Thanks Gary, ill apply that change.

It will be a cleaner code
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