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From: Perry Smith <pedz@easesoftware.com>
To: Zsh-Users List <zsh-users@zsh.org>
Subject: Naive read mistake
Date: Thu, 16 Jun 2022 11:29:17 -0500	[thread overview]
Message-ID: <8D7372B3-C4F1-4ED4-81D6-C11C3B7D385A@easesoftware.com> (raw)

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I’ve been seriously confused with a simple function that is reading the output from a curl https command.  I finally figured out the issue and everything is working as documented but thought I would tell of my saga.

From the documentation for “read”:

>               The value (exit status) of read is 1 when an end-of-file is
>               encountered, or when -c or -l is present and the command is not
>               called from a compctl function, or as described for -q.  Otherwise
>               the value is 0.

I had the common loop:

while read line ; do … done

For me in this instance, the loop is not executed on the last line because it is not terminated with a newline.  line is set but the read returns 1 since it hit EOF.  All this is correct as far as I can tell but I just wasn’t expecting it.

I’m using curl with “-i” to an HTTPS API returning headers and JSON.  The function I was having problems with was to separate the headers from the JSON output.  So this issue might come up for others.

Thank you for your time,

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                 reply	other threads:[~2022-06-16 16:30 UTC|newest]

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