How to print #!/bin/bash using echo command

Question

I have tried the escape character but it doesn't seems works with !. I need this to auto-configure packages using scripts.

score 13 · Accepted Answer · answered Apr 01 '14 at 21:48

13

! is magic in a default interactive bash session, but not in scripts (set +H to disable in an interactive prompt). In any case:

echo '#!/bin/bash'

answered Apr 01 '14 at 21:48

that other guy

That is, using single quotes you avoid variable expansion. – fedorqui Apr 01 '14 at 22:16

score 5 · Answer 2 · answered Apr 01 '14 at 21:52

5

Or with no quotes and escaping the # and the !:

echo \#\!/bin/bash

answered Apr 01 '14 at 21:52

Digital Trauma

Avi Das · Answer 3 · 2014-04-02T07:11:32.633

1

printf should work too:

printf '#!/bin/bash\n'

edited Apr 02 '14 at 07:11

answered Apr 01 '14 at 23:19

Avi Das

1

`printf` is beside the point. The issue is the shell's interpreting of the hashmark, not which command it's passed to. (Also, if you're going to use `printf`, you'll want to include a `\n` at the end, or your shebang line will run into the next line printed. – Adam H. Peterson Apr 01 '14 at 23:48
(Correction: I meant bang, rather than hashmark.) – Adam H. Peterson Apr 02 '14 at 00:14
Whoops you are right, it does need the \n – Avi Das Apr 02 '14 at 07:11
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. – ElmoVanKielmo Apr 02 '14 at 07:18
@ElmoVanKielmo It does provide an answer to the question, though the issue OP was having wasn't really related to `echo/printf` so it's basically the same as [that other guy's](http://stackoverflow.com/a/22797555/3076724) – Reinstate Monica Please Apr 02 '14 at 23:26
@BroSlow this was a review and as you probably know - messages are predefined in that case. – ElmoVanKielmo Apr 03 '14 at 05:25

3 Answers3