linux 查看进程的运行时间

有些时候我们需要知道某个进程的启动时间！ 

显示某PID的启动时间命令： 

1 ps -p PID -o lstart

举例子

如下面显示httpd的启动时间： 

 for pid in $(pgrep httpd); do echo -n "${pid}"; ps -p ${pid} -o lstart | grep -v "START"; done

写个小脚本，根据传入的参数显示对应进程的启动时间 
比如运行：./show.sh  mysql 显示mysql进程的启动时间： 

Bash代码  

 #!/bin/bash
 if [ -z $1  ]; then
     echo "please input ps keyword" && exit 1
 fi
 ps aux |grep $1 |grep -v "grep $1" |grep -v " $1" |while read line
 do
     linewords=($line)
     pid="${linewords[1]}"
     START_TIME=$(ps -p ${pid} -o lstart | grep -v "START")
     echo "$line $START_TIME"
 done