How to pass a script-file to sed as a heredoc?

Question

This converts 'a' to 'A'.

sed 's/a/A/g' <(echo "foobar")
foobAr

This supplies the commands necessary to make each vowel upper-case:

$ cat << EOF
s/a/A/g
s/e/E/g
s/i/I/g
s/o/O/g
s/u/U/g
EOF

What I'm trying to do, is to extend the first example so as to make upper case each vowel, and using a here doc, as in the second example. Any suggestion?

Man:

sed [OPTION]... {script-only-if-no-other-script} [input-file]...

-f script-file, --file=script-file add the contents of script-file to the commands to be executed

score 2 · Accepted Answer · answered Apr 05 '23 at 21:28

2

You can use - with sed -f to indicate that the script should be read from standard input:

$ cat << EOF | sed -f - <(echo foobar)
s/a/A/g
s/e/E/g
s/i/I/g
s/o/O/g
s/u/U/g
EOF
fOObAr

answered Apr 05 '23 at 21:28

steeldriver

81,074

score 0 · Answer 2 · answered Apr 05 '23 at 22:00

0

In this case, tr is the appropriate solution:

$ echo foobar | tr [aeiou] [AEIOU]
fOObAr

answered Apr 05 '23 at 22:00

RonJohn

1,148

More elegant, but this was more a case of reminding myself of some basics than... – Erwann Apr 05 '23 at 22:19
3

If you use this method, you'd want to quote [aeiou] and [AEIOU] unless globbing is disabled in your shell – steeldriver Apr 05 '23 at 22:22
@Erwann I wondered if that might be the case… – RonJohn Apr 05 '23 at 22:32

How to pass a script-file to sed as a heredoc?

2 Answers2