4

There have been several situations where I have had some output such as 

thing1 thing2 thing3

But have wanted to do something like:

*command* thing1 *command* thing2 *command* thing3

An example of this would be: let's say I want to kill all screen sessions. Is there any way I can get one command to use somthing like:

screen -ls

which might result in 

88.mine (detached) 22.mine (detached)

Can I do something that would result in all of the possible commands such as this:

screen -S 88.mine test -X screen -S 88.mine test -X

in one fell swoop?

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2 Answers 2

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8

Sure, just use read:

while read -r line; do command "$line" done < file

In your more specific screen example, you need to remove the remaining text:

while read -r session _; do screen -S "$session" test -X done < file
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0

There are a couple of ways of reading a newline separated list as input. The one you choose will depend on what exactly you are trying to do, but here are some simple examples:

  • while/read

    $ printf "Tom\nDick\nHarry\n" | while read name; do echo "Hi $name"; done Hi Tom Hi Dick Hi Harry

  • for

    $ for name in $(printf "Tom\nDick\nHarry\n"); do echo "Hi $name"; done Hi Tom Hi Dick Hi Harry
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