Question

I have the following shell script :

#!/bin/sh
output=`./process_test.sh status_pid | grep "NOT STARTED: process_1" --line-buffered`
if[[ -z  ${output} ]]
then
    echo "process is not running"
else
    echo "process is  running"
fi

where ./process_test.sh status_pid is my utility for finding whether a process is running or not .e.g. if process_1 is not running it will give: NOT STARTED: process_1. Further
this utility is perfect and does not have any issue. I suspect the issue is with if syntax

on running this script I get the following output:

./test.sh: line 18: if[[ -z  NOT: command not found
./test.sh: line 19: syntax error near unexpected token `then'
./test.sh: line 19: `then'

Can you help to resolve this issue?

Answer 1

You must use spaces to separate keywords such as if from the arguments or commands such as [[.

#!/bin/sh
output=$(./process_test.sh status_pid | grep -e "NOT STARTED: process_1" --line-buffered)
if [[ -z ${output} ]]
then
    echo "process is not running"
else
    echo "process is running"
fi