CODEWITHSUNDEEP
linuxbashprocesscentoscentos7
RandomCoder
RandomCoder

Reputation: 1428

Bash script to kill process older than x time - syntax error in expression

I'm trying to write a script to kill a process by ID if it is older than 5 minutes. I already know the process ID in $pid.

pid=1234

# 300 seconds = 5min
maximum_runtime=300

process_start_time=`ps -o lstart= -p $pid`
current_time=`date +%s`

let diff=${current_time}-${process_start_time}

if [ $diff -gt $maximum_runtime ]
then
    kill -3 $pid
fi

This results in an error:

./script.sh: line 9: let: 11:41:01: syntax error in expression (error token is ":41:01")

I used some code from this answer. Any ideas how to resolve this?

Upvotes: 1

Views: 110

Answers (1)

Bulikeri
Bulikeri

Reputation: 156

pid=1234

# 300 seconds = 5min
maximum_runtime=300

process_start_time=`ps -o lstart= -p $pid`
current_time=`date` #got the tiem in same format

let diff="$(($(date -d "$current_time" '+%s') - $(date -d "$process_start_time" '+%s')))"
#result for diff in secconds, calculated using date tool

if [ $diff -gt $maximum_runtime ]
then
    kill -3 $pid
fi

Upvotes: 1

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