RAR: How to Add archive comment from a file or string?

Question

I am wring a BASH script. I am using RAR 3.93 on Ubuntu 10.08. I want to add a comment to an archive example.rar. The comment is "This is a comment".

rar c example.rar
Processing archive rarcomment.rar
Reading comment from stdin

But I want to add the comment from a variale instead of typing it from the stdin.

$Comment="This is a comment"

How can I do that?

Tatu Lahtela · Answer 1 · 2011-11-02 11:33:08Z

up vote 5 down vote

    export COMMENT="This is a comment
with multiple lines"
    echo "$COMMENT" | rar c example.rar

To write multiple line variables, just don't close the quote until you are done. To make it append to the echo, use quotes.

answered Nov 2 '11 at 11:06

	Cool. What if I want to add a new line in the comment, like "This is a comment\nGlad it is working." Obviously, `\n` wont work. – DocWiki Nov 2 '11 at 11:14
	I expanded the answer to illustrate this as well. – Tatu Lahtela Nov 2 '11 at 11:33

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