linux - use text and use as command? -

i whant build script extract word file in command:

for example: in file keep username , how can export username without knowing username part of command , command : suspend here should word exported?

from file has text inside "john" how can tell command : suspend username john ?

how can cat/grep/sed text file part of command :

something suspend |cat file , have try suspend command not take username , there should different .

my ideea this

#!/bin/sh username=cat my-file;  suspend $username , 

but had no succes , because $username not display cat , cat shows thats doing.

use following syntax

  username=$(cat my-file) 

you might use backquotes like

  username=`cat my-file` 

but $(...) notation preferable: can nested , more readable.

please read advanced bash scripting guide (it teach lot, if can criticized)

your usage of suspend incorrect, , don't understand want it. suspending user mean you? perhaps want use pgrep or pkill (to kill processes of user, feel harsh)...?