在执行 script.sh 之前，检查 script.sh 是否正在运行，如果它正在运行 kill 并继续

Question

CMD# bash script.sh

#!/bin/bash

PRE_CHECK=$0

PROCESS_ID=`ps -ef | grep "$PRE_CHECK" | egrep -v 'grep' | awk '{print $2}'`

[[ ! -z $PROCESS_ID ]] && kill -9 $PROCESS_ID

echo ""
echo ""
echo ""

Answer 1

In order to know this, you need to know your own process ID. This is stored in the variable $$ , so you need to kill all PIDs, except for that one.