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Full Discussion: Error in finding the PID by grep and assigning to a variable
Top Forums Shell Programming and Scripting Error in finding the PID by grep and assigning to a variable Post 302739385 by duddukuri on Tuesday 4th of December 2012 06:38:40 AM
Old 12-04-2012
Wrench Error in finding the PID by grep and assigning to a variable
Hello All,
I am facing difficulty in getting the PID value & then assigning it to a variable,
kindly help me in resolving the issue.
Thanks a lot in advance.

The custom utility used inside the Test2.sh will process the file in a batch of 10 lines at once and for efficient memory management, once first batch is completed, it will start a new process of the custom_utility to process the next batch and this goes on till all batches are processed.
command executing at shell: ./Test2.sh -f=./input.txt

The Test2.sh should not exit till all the batch process of this file are completed by the custom utility.
For this reason, i used the while loop in which i am grepping for the PID having the name custom_utility & the input file and assigning it to a variable. if variable is blank, come out of loop is the logic.

Though the Sub process is running, the SUB_PID is returning blank and it is coming out of loop

Test.sh only contains the while loop logic and it is working fine.

Please help me in this regard.

-Chandra
***************************************************
Test2.sh
Code:
#! /bin/sh
if [ $# -eq 0 ]; then
    echo ""
    echo "No Parameter provided"
    usage
    exit 1
fi

# Parse command line options
for PARAM; do
    if [[ "$PARAM" = -f=* ]]; then
           FILE=$(echo $PARAM | cut -d"=" -f2)
           echo $FILE
    fi

done
    if [[   ( "$FILE" == "" )  ]]; then
            echo ""
            echo "File argument is not specified, exiting the script..."
            exit 1
    fi

    if [ ! -r ${FILE} ];then
            echo "Read access permission denied on $FILE File or File doesn't exists, exiting the script..."
            exit 1
    fi

COMMAND="custom_utility  -u=user1 -p=123 -filename=$FILE -batch_size=10"
echo "Command of Custom Utility is :"
echo ""
echo "custom_utility  -u=user1 -p=***** -f=send -filename=$FILE -batch_size=10"

$COMMAND &
CU_RC=$?
echo "lets wait till all custom_utility  process for this Input File are completed"
echo "PID : $!"
wait $PID
while true
do
        SUB_PID=`ps -ef | grep custom_utility  | grep $FILE | grep -v 'grep' | awk '{print $2}'`
        if [[  "$SUB_PID" == "" ]]; then
        break
        fi
        sleep 2
done

if [ $CU_RC -ne 0 ]; then
        echo "Error: Custom Utility for $FILE resulted in error"
        echo ""
        exit 992
fi
echo "***************************************************"
echo ""

# EOF
exit 0

***************************************************
Test.sh
Code:
#! /bin/sh

while true
do
        SUB_PID=`ps -ef | grep custom_utility | grep "./input.txt" | grep -v 'grep' | awk '{print $2}'`
        echo "SUB_PID : ~$SUB_PID~"
        if [[  "$SUB_PID" == "" ]]; then
        echo `date`
        break
        fi
        sleep 2
done

 

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LEARN ABOUT DEBIAN

dpid.h

dpid.h(3)							     libdaemon								 dpid.h(3)

NAME

       dpid.h -

       Contains an API for manipulating PID files.

SYNOPSIS

       #include <sys/types.h>

   Defines
       #define DAEMON_PID_FILE_KILL_WAIT_AVAILABLE   1
	   This variable is defined to 1 iff daemon_pid_file_kill_wait() is supported.

   Typedefs
       typedef const char *(* daemon_pid_file_proc_t )(void)
	   Prototype of a function for generating the name of a PID file.

   Functions
       const char * daemon_pid_file_proc_default (void)
	   A function for creating a pid file name from daemon_pid_file_ident.
       int daemon_pid_file_create (void)
	   Creates PID pid file for the current process.
       int daemon_pid_file_remove (void)
	   Removes the PID file of the current process.
       pid_t daemon_pid_file_is_running (void)
	   Returns the PID file of a running daemon, if available.
       int daemon_pid_file_kill (int s)
	   Kills a running daemon, if available.
       int daemon_pid_file_kill_wait (int s, int m)
	   Similar to daemon_pid_file_kill() but waits until the process died.

   Variables
       const char * daemon_pid_file_ident
	   Identification string for the PID file name, only used when daemon_pid_file_proc is set to daemon_pid_file_proc_default().
       daemon_pid_file_proc_t daemon_pid_file_proc
	   A function pointer which is used to generate the name of the PID file to manipulate.

Detailed Description
       Contains an API for manipulating PID files.

       Definition in file dpid.h.

Define Documentation
   #define DAEMON_PID_FILE_KILL_WAIT_AVAILABLE	 1
       This variable is defined to 1 iff daemon_pid_file_kill_wait() is supported. Since:
	   0.3

       See also:
	   daemon_pid_file_kill_wait()

       Definition at line 82 of file dpid.h.

Typedef Documentation
   typedef const char*(* daemon_pid_file_proc_t)(void)
       Prototype of a function for generating the name of a PID file.

       Definition at line 37 of file dpid.h.

Function Documentation
   int daemon_pid_file_create (void)
       Creates PID pid file for the current process. Returns:
	   zero on success, nonzero on failure

       Examples:
	   testd.c.

   pid_t daemon_pid_file_is_running (void)
       Returns the PID file of a running daemon, if available. Returns:
	   The PID or negative on failure

       Examples:
	   testd.c.

   int daemon_pid_file_kill (int s)
       Kills a running daemon, if available. Parameters:
	   s The signal to send

       Returns:
	   zero on success, nonzero on failure

   int daemon_pid_file_kill_wait (int s, int m)
       Similar to daemon_pid_file_kill() but waits until the process died. This functions is new in libdaemon 0.3. The macro
       DAEMON_PID_FILE_KILL_WAIT_AVAILABLE is defined iff libdaemon supports this function.

       Parameters:
	   s The signal to send
	   m Seconds to wait at maximum

       Returns:
	   zero on success, nonzero on failure (timeout condition is considered a failure)

       Since:
	   0.3

       See also:
	   DAEMON_PID_FILE_KILL_WAIT_AVAILABLE

       Examples:
	   testd.c.

   const char* daemon_pid_file_proc_default (void)
       A function for creating a pid file name from daemon_pid_file_ident. Returns:
	   The PID file path

   int daemon_pid_file_remove (void)
       Removes the PID file of the current process. Returns:
	   zero on success, nonzero on failure

       Examples:
	   testd.c.

Variable Documentation
   const char* daemon_pid_file_ident
       Identification string for the PID file name, only used when daemon_pid_file_proc is set to daemon_pid_file_proc_default(). Use
       daemon_ident_from_argv0() to generate an identification string from argv[0]

       Examples:
	   testd.c.

   daemon_pid_file_proc_t daemon_pid_file_proc
       A function pointer which is used to generate the name of the PID file to manipulate. Points to daemon_pid_file_proc_default() by default.

Author
       Generated automatically by Doxygen for libdaemon from the source code.

Version 0.14							    17 Jan 2010 							 dpid.h(3)
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