linuxcentoscentos5

combine multiple linux commands in one line

I am trying to merge multiple linux commands in one line to perform deployment operation. For example

nohup php 1.php
nohup php 2.php
nohup php 3.php
nohup php 4.php

I want perform all of them in parallel, it is possible in a .sh file?

Solution

  • you can also do-it like that :

    nohup sh -c 'php 1.php; php 2.php; php 3.php' &

    edit : to answer your question, the process are parallel. you can verify this by writing the ps command. eg : with the sleep command :

    nohup sh -c 'sleep 30 && sleep 30' &

    output :

     ....
 6920    7340    7340       6868  pty2    17763 16:33:27 /usr/bin/sleep
 6404    4792    4792       7004  pty2    17763 16:33:26 /usr/bin/sleep
 ....

    edit 2 : Ok then try with parallel command. (you probably have to install it)

    Create a file cmd.txt : 

    1.php
2.php
3.php

    Then execute this command (haven't tried yet, but it should work). you can change the --max-procs numbers if you have more/less than 4 core :

    cat cmd.txt | parallel --max-procs=4 --group 'php {}'

    hope it works...