From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: lilydjwg <lilydjwg@gmail.com>
Cc: zsh-users@zsh.org
Subject: Re: test for newline in a variable--unexpected results sometimes
Date: Sun, 16 Sep 2018 20:44:33 +0000 [thread overview]
Message-ID: <20180916204433.6k36inmuekgqp3a2@tarpaulin.shahaf.local2> (raw)
In-Reply-To: <20180916172716.GA27892@lilyforest.localdomain>
lilydjwg wrote on Mon, Sep 17, 2018 at 01:27:17 +0800:
> I get output from the skim tool. Then I test if it's multiline or not,
> but it fails mysteriously for some cases.
>
> My test is like this:
>
> [[ $cmd = *\n* ]]
>
In this context, «\n» does not mean a newline; it means either the letter 'n',
or the two-character sequence «\n», but I don't remember which.
> cmd2="cd \ncd /sys/class/leds"
Ditto.. If you try «xxd <<<$cmd2» you'll see the variable's value contains the
two-character sequence «\n».
What you're looking for is [[ $cmd == *$'\n'* ]]. «\n» is an escape sequence
in $''-strings, but not in other kinds of strings.
Cheers,
Daniel
next prev parent reply other threads:[~2018-09-16 20:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-16 17:27 lilydjwg
2018-09-16 20:44 ` Daniel Shahaf [this message]
2018-09-16 20:53 ` dana
2018-09-16 21:44 ` Dangling reference in zshroadmap(1) (was: Re: test for newline in a variable--unexpected results sometimes) Daniel Shahaf
2018-09-16 22:16 ` dana
2018-09-16 22:56 ` Daniel Shahaf
2018-09-17 3:20 ` test for newline in a variable--unexpected results sometimes lilydjwg
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