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bug#44409: Example in manual no longer works
From: |
積丹尼 Dan Jacobson |
Subject: |
bug#44409: Example in manual no longer works |
Date: |
Wed, 04 Nov 2020 07:32:42 +0800 |
>>>>> "EZ" == Eli Zaretskii <eliz@gnu.org> writes:
EZ> The example in the manual doesn't mention /etc/motd of any other binary
file. It uses text files, where this issue doesn't exist.
Since when is /etc/motd a binary file?
If it were a binary file, the first grep,
>> $ grep --color -nH --null -e a /etc/motd
>> /etc/motd:2:The programs included with the Debian GNU/Linux system are free
>> software;
>> /etc/motd:3:the exact distribution terms for each program are
>> described in the...
would fail.
But it doesn't. Only the second grep fails:
>> $ grep --color -nH --null -e a /etc/motd | grep x
>> Binary file (standard input) matches
So we see the issue indeed exists with text files!!
Double proof:
$ file /etc/motd
/etc/motd: ASCII text
Thus we see that one cannot simply slap
"| grep bar | grep toto"
onto the end of a working grep command anymore!
Back when the manual was written, one could. But not anymore.
EZ> Yes, but you need to edit that prompt anyway in order to type the
EZ> command with a pipe, so the original prompt doesn't matter much.
No!
In the past one could simply slap the pipe(s) on to the back.
Now that no longer works.
Therefore the example needs to be rewritten to make it work again.
(Or specific instructions need to be given: "Be sure to remove any
'--null' that emacs has stuck in, for this example to work.")