combine multiple linux commands in one line

Question

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?

Suraj Singh · Accepted Answer · 2013-12-09 15:31:25Z

3

In linux you can use && to execute commands sequentially, and a command will only execute if the previous one succeeded.

nohup php 1.php && nohup php 2.php && nohup php 3.php

Edit: in case you do not want the error-checking provided by the && operator, use the semicolon (;) to chain the commands, like this:

nohup php 1.php ; nohup php 2.php ; nohup php 3.php

edited Dec 9, 2013 at 15:31

Suraj Singh

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answered Dec 9, 2013 at 15:08

Niels

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Comments

gnometorule · Accepted Answer · 2013-12-09 15:08:57Z

1

If you don't mind putting them into the background, you can do that by putting

& ;

between the 1st/2nd, and 2nd/3rd. This will execute the 3 essentially in parallel.

&: execute in bg
; do 2nd command irrespective of success of 1st

answered Dec 9, 2013 at 15:08

gnometorule

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1 Comment

gnometorule Over a year ago

The above should do this. If you check with 'ps' after, you will see 3 instances of php running (assuming they are long enough to take a few seconds at least). Processor handles that for you.

onionpsy · Accepted Answer · 2013-12-09 15:55:29Z

0

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...

edited Dec 9, 2013 at 15:55

answered Dec 9, 2013 at 15:18

onionpsy

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5 Comments

user3083317 Over a year ago

it's work fine but one after one not parallel, how to run all files in parallel?

user3083317 Over a year ago

when I run the php files and get the uptput I see that the files run one after one and not in parallel...

onionpsy Over a year ago

@user3083317, read what i've wrote : you probably have to install it

user3083317 Over a year ago

and it's possible to prevent print of the output?

onionpsy Over a year ago

This should work, the outpout won't be printed on the screen and the process will run in background : sh -c "cat cmd.txt | parallel --max-procs=4 --group 'nohup php {}'&>/dev/null"& Any idea how to close the putty session after. maybe with exit command at the end, I cannot test right now. Anyway, if my answer helped you, mark as "resolved".

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