Use xargs input in eval command [duplicate]

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I have a file "commands.php" that dynamically generates bash commands. For example, one line is:

# - commands.php
ssh [email protected] echo "text" > file; reboot;

How can I use the output of xargs to execute these commands... eval, maybe?

cat commands.php | xargs -L 1 -I {} 'eval "$({})"';

Sounds like XY problem. Why would you want to do this? What's wrong with bash /path/to/file? — Patrick, Dec 24 '13 at 23:54
Hi Patrick, very well could be! I have a file that dynamically generates bash commands, and it is not a .sh file. (I could copy the output to an sh file, but am interested in how to execute each line of a non-sh file — d-_-b, Dec 24 '13 at 23:56
Everything else aside, is this php script actually. Allen from the web? This seems very risky. — mattdm, Dec 25 '13 at 0:47
@mattdm haha good catch! but yes this is a very secure environment, not some public external file. — d-_-b, Dec 25 '13 at 0:55

d-_-b · Answer 1 · 2013-12-25 00:27:08Z

up vote 1 down vote

Figured out a way:

cat commands.php | xargs -L 1 -I {} sh -c "{}"

runs each command out of shell... simple enough!

answered Dec 25 '13 at 0:27

d-_-b
295313

Why do you insist on cating the file? A simple redirection would be enough: xargs ... <commands.php – Joseph R. Dec 25 '13 at 2:12

And if you want to do it in parallel, use GNU Parallel: cat commands.php | parallel – Ole Tange Dec 27 '13 at 20:20

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DopeGhoti · Answer 2 · 2013-12-25 00:21:05Z

up vote 2 down vote

If your PHP file outputs shell commands, you could probably get away with

$( php /path/to/your/script.php )

Or

while read line; do
    $line
done < $( php /path/to/your/script.php )

answered Dec 25 '13 at 0:21

DopeGhoti
3,9871619

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marked as duplicate by Joseph R., jasonwryan, Anthon, Bernhard, slm♦ Dec 25 '13 at 15:54