I am starting with Linux bash scripting and I have found a bash script which uses:
my_command << OMG
..rest_of_commands
OMG
What does this OMG means? I have been searching about it but I did not found any information about it.
Thank you.
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Its a [multiline heredoc](https://stackoverflow.com/a/23930212/5625547) format. – 0stone0 Apr 16 '20 at 11:42
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Oh, thank you so much!! – JuMoGar Apr 16 '20 at 15:39
1 Answers
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That's known as a here-doc (so now you can investigate further), it basically takes everything up to (but excluding) the OMG line and provides it as standard input to the my_command executable.
The OMG is any string that must match between the two areas and there are ways to allow for tabs and spaces to be ignored at the start of each line, but the basic concept is as I've described.
The following transcript shows it in action, where cat is used to copy standard input to standard output:
pax:~$ cat <<XYZZY
> hello
> there
> XYZZY
hello
there
paxdiablo
- 854,327
- 234
- 1,573
- 1,953
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Thank you so much!! I was searching incorrect thing, I was searching for "OMG" instead "<<" – JuMoGar Apr 16 '20 at 15:39