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Re: replacement for 'join'?

From: Bernhard Voelker
Subject: Re: replacement for 'join'?
Date: Tue, 6 Apr 2021 00:48:19 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

On 4/5/21 1:06 AM, Bruno Haible wrote:
> Alpine Linux does not have the 'join' program.
> The GCS [1] don't list it among the essential utilities.

FWIW: join(1) is required by POSIX [1]:

[1] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/join.html

> So, what kind of replacement for it would you recommend?
> My use-case is
>   join -v 1 FILE1 FILE2

Maybe awk?

  $ awk -v keyfile=file2 '
      BEGIN { while ((getline < keyfile) > 0) k[$1]=1 }
      ' file1

  $ awk '
      keys { k[$1]=1; next }
      ' keys=1 file2 keys=0 file1

To be honest, I'm not sure whether the variable assignment on the command line
or getline in a BEGIN block is more portable.

Have a nice day,

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