LinuxQuestions.org - [SOLVED] process monitor code

My System details are :
NAME="Red Hat Enterprise Linux Server"
VERSION="7.2 (Maipo)"
Shell = bash

I am trying to build a process monitor, that prints the status of the process.

In the below code , I am trying to compare the process state pid_status with strings we get from command /proc/$pid/status

But it throws error at the comparison if ["$pid_status" =~ .*"sleeping"*. ] || ["$pid_status" == *"stopped"* ] || ["$pid_status" == *"running"* ];

The error is:

Quote:

./process_monitor_lq.sh: line 29: $'[State:\tS (sleeping)': command not found

I have tried to do other alternatives by removing tabs from command output and also extracting part of strings, but none succeeded.

Following is the output I am getting:

Quote:

The pid is 31395
Process with 31395 is monitored for its status
*Status = State: S (sleeping)
./process_monitor_lq.sh: line 22: pid_status1: command not found
#Status =
./process_monitor_lq.sh: line 25: x: command not found
./process_monitor_lq.sh: line 26: y: command not found
x =
y =
./process_monitor_lq.sh: line 29: $'[State:\tS (sleeping)': command not found
./process_monitor_lq.sh: line 29: $'[State:\tS (sleeping)': command not found
./process_monitor_lq.sh: line 29: $'[State:\tS (sleeping)': command not found
The pid is
pid entry is not available in the /proc
The pid is
pid entry is not available in the /proc
The pid is 31395
Process with 31395 is monitored for its status
*Status = State: R (running)
./process_monitor_lq.sh: line 22: pid_status1: command not found
#Status =
./process_monitor_lq.sh: line 25: x: command not found
./process_monitor_lq.sh: line 26: y: command not found
x =
y =
./process_monitor_lq.sh: line 29: $'[State:\tR (running)': command not found
./process_monitor_lq.sh: line 29: $'[State:\tR (running)': command not found
./process_monitor_lq.sh: line 29: $'[State:\tR (running)': command not found

Code:



#!/bin/bash

SUB_S = "sleeping"

SUB_R = "running"



do_start() {

    # List of process names to be monitored for its status(R,S,T etc).

    declare -a PROCESS_LIST

    PROCESS_LIST=("process_1" "process_2" "process_3" )



    for process in "${PROCESS_LIST[@]}"; do

        pid=$(pidof $process)

        echo "The pid is $pid"

        if [ $pid ]; then

            #Do Nothing

            echo " Process with $pid is monitored for its status"

            

            pid_status=`head /proc/$pid/status | grep "State:*"`

            echo "*Status = $pid_status"

        #trying to remove spaces and tabs, but does not work

            #pid_status = echo "$pid_status" | sed -e 's/^[[:space:]]*//'

            #pid_status1 = echo "$pid_status" | sed -E 's,\\t|\\r|\\n,,g'

            pid_status1 = echo "$pid_status" | tr -d '[:space:]'

            echo "#Status = $pid_status1"

        #trying to extract part of status, but does not work

            x = grep -q "$SUB_R" <<< "$pid_status"

            y = grep -q "$SUB_S" <<< "$pid_status"

            echo "x = $x"

            echo "y = $y"

            if ["$pid_status" =~ .*"sleeping"*. ] || ["$pid_status" == *"stopped"* ] || ["$pid_status" == *"running"* ]; then

                echo "process:$process with pid $pid is having status $pid_status"

            fi

        else

            echo "pid entry is not available in the /proc"

        fi

    done

}



while :

do 

    do_start 

    sleep 2

done

Request any experts help, TIA