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Full Discussion: Finding PID of a process using variable substituition
Top Forums Shell Programming and Scripting Finding PID of a process using variable substituition Post 302296391 by ruben.rodrigues on Wednesday 11th of March 2009 05:22:35 AM
Old 03-11-2009
Quote:
Originally Posted by amio
Hi All,
Am copying mulitple files in a directory in names File0,File1,File2 etc.
I need to print separately the PID of these copies using File names.

Code:
for((i=0;i<5;i++))
do
mypid=`ps aux | awk '/File$i/ && !/awk/ { print $2 }'`
echo PID is $mypid
done

It printed nothing. Thinking "File$i" is not found. Am i right? Is there a way to find the PID of a process using variable substituition? If not, how it cud be achieved?

FYI,I got the PID of FIle0 or FIle1 if i use its name specifically like,

Code:
mypid=`ps aux | awk '/File0/ && !/awk/ { print $2 }'`
echo PID is $mypid

Thanks,
Amio
try

ps aux | awk '/File$i/ && !/awk/ { print $2 }' & mypid=$!
echo mypid
 

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LEARN ABOUT DEBIAN

msvc

msvc(8) 						      System Manager's Manual							   msvc(8)

NAME

       msvc - control minit

SYNOPSIS

       msvc [ -[uodpchaitko] ] [ -P pid ] service [...]

DESCRIPTION

       msvc  is the management interface to minit.  service is the service directory name relative to /etc/minit.  Starting with minit 0.9 you can
       also include /etc/minit/ in the service name.

OPTIONS

       If no option is given, msvc will just print a small diagnostic message to stdout, saying if the service is up, down or finished, which  PID
       it has if it is up, and for how long it has been in this state.

       -u   Up.  If the service is not running, start it.  If the service stops, restart it.

       -o   Once.  If the service is not running, start it.  If the service stops, do not restart it.

       -d   Down.  If the service is running, send it a TERM signal and then a CONT signal.  After it stops, do not restart it.

       -p   Pause.  Send the service a STOP signal.

       -c   Continue.  Send the service a CONT signal.

       -h   Hangup.  Send the service a HUP signal.

       -a   Alarm.  Send the service an ALRM signal.

       -i   Interrupt.	Send the service an INT signal.

       -t   Terminate.	Send the service a TERM signal.

       -k   Terminate.	Send the service a KILL signal.

       -P pid
	    Set PID.  Tell minit the PID of the service is really pid.	This is useful for services that fork themselves in the background but put
	    their real PID in a file, typically called /var/run/service.pid.  Used by pidfilehack.

       -D service
	    Print dependencies.  This will print all the names of all the services that were started  because  this  services  depended  on  them.
	    Please  note  that this is not done recursively (i.e. if default depends on qmail and qmail depends on log, this will print qmail, not
	    qmail/log.	But msvc -D qmail will print qmail/log).

       -H   Print history.  This will print the names of the ten least recently spawned processes.  This is useful if you see  a  process  looping
	    (initialization fails and minit is restarting it all the time).

RETURN CODES

       Generally,  msvc  return zero if everything is OK or 1 on error (could not open /lib/minit/in or /lib/minit/out or there is no process with
       the given name).  In diagnostic mode, it will exit 0 if the service is up, 2 if it is down or 3 if it is finished.

SEE ALSO

       pidfilehack(8), svc(8)

																	   msvc(8)
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