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There are many commands that accept multiple parameters, like touch, ls and rm. So that I can use the construct {1..3} to generate multiple parameters for the command. For example:

[root@192 ~]# touch file{1..3}
[root@192 ~]# ls file{1..3}
file1  file2  file3
[root@192 ~]# rm -f file{1..3}
[root@192 ~]#

Some commands don't support multiple parameters, like groupadd. So the following command generates an error:

[root@192 ~]# groupadd g{1..3}
Usage: groupadd [options] GROUP
...
[root@192 ~]#

Is it possible to generate multiple complete commands like groupadd g1; groupadd g2; groupadd g3;? I tried the following command, but failed:

[root@192 ~]# `"groupadd g"{1..3}`
bash: groupadd g1: command not found...
[root@192 ~]#

Btw, I'm a Bash new user and the example is just for demo purposes. I'm not trying to create a bunch of groups.

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2 Answers 2

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There are several ways to do this. One of the simplest and most obvious is to use a for loop. For example:

for g in {1..3}; do groupadd "g$g" ...other groupadd args here... ; done

Note: unlike your touch, ls, and rm examples (which run the commands ONCE with multiple arguments, the expansion of file{1..3}), this runs groupadd THREE times, with one "g$g" argument each time.

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I found a way which is shorter than a for loop.

eval "groupadd g"{1..3}";"
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