The Linux shell gets the process ID, or gets the process in the application Id__linux

1, the Linux shell to get the process ID method: ps-a |grep "/usr/sbin/gps_app" | awk ' {if ($ = = ' start ') {print}} '
Pidof "CmdName" Pgrep "CmdName"

The results of these three kinds of operations in bash and BusyBox ash are slightly different,

First: ps-a, listing all processes

grep "CmdName" to filter for processes that match cmdname fields

awk ' {if ($ = = "' start ') {print}} ', matches the row in the 6th column of the Start field, prints out the first row of the line

Second: Pidof can only get the process number that the program's file name matches to, in ash such as Pidof "usr/bin/telnetd" and Pidof "telnetd" The result is not the same, the previous result is empty, but in bash to do both.

The third: The Pgrep method Pidof "Usr/bin/ser_app" and Pidof "Ser_app" run the same result, which returns the process ID that is matched to.

2, C language get process ID

int gps_pid = Getpid ();

sprintf (Sys_cmd, "echo%d >/var/run/gps_app.pid", gps_pid);

System (CMD);