[英]How to return the PID from a bash script executed from a bash script
下面的get_pid()函數旨在返回daemon_itinerary.sh
的PID。
以下腳本與daemon_itinerary.sh
不在同一個工作目錄中。
#!/bin/bash
PID=""
get_pid() {
PID='pidof daemon_itinerary.sh'
}
start() {
echo "Restarting test_daemon"
get_pid
if [[ -z $PID ]]; then
echo "starting test_daemon .."
sh /var/www/bin/daemon_itinerary.sh &
get_pid
echo "done. PID=$PID"
else
echo "test_deamon is alrady running, PID=$PID"
fi
}
case "$1" in
start)
start
;;
...
*)
echo "Usage: $0 {start|stop|restart|status}"
esac
*編輯
Start作為命令行參數傳遞。
我們使用pgrep獲取如下所示的進程的pid
PID=$(pgrep -f "daemon_itinerary.sh" | xargs)
# xargs - is given because pgrep will return both process id as well as parent pid
# also it will help us to get all pids if multiple instances are running.
# pgrep option to get session id or parent id alone, here its from manual
# -P, --parent ppid,...
# Only match processes whose parent process ID is listed.
# -s, --session sid,...
# Only match processes whose process session ID is listed. Session ID 0 is translated into pgrep's or pkill's own session ID.
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