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egrep warning #641

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MmeOokamy opened this issue Oct 14, 2022 · 3 comments
Open

egrep warning #641

MmeOokamy opened this issue Oct 14, 2022 · 3 comments
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@LukasFritzeDev

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@MmeOokamy
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Hello everybody,

My OS : ManjaroLinux 22.0.0
today I updated grep.
after reboot of the system I met an error during the commands git ftp init / push:

egrep: warning: egrep is obsolescent; using grep -E

I'm not sure if this is the right solution but in my file /bin/git-ftp, I replaced all occurrences of egrep by grep -E
now i don't have any error with git ftp.

is it the right thing to do or not?
@alfiosalanitri
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same warning with Arch Linux

@Vinze
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Vinze commented Nov 4, 2024

I'm guessing more and more people will get this warning as distros upgrade their grep version.

Will replacing egrep with grep -E break older systems? If not this seems like an easy fix.

@LukasFritzeDev
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Looks like this change was introduced in GNU grep version 3.8, released in September 2022.

The egrep and fgrep commands, which have been deprecated since release 2.5.3 (2007), now warn that they are obsolescent and should be replaced by grep -E and grep -F.
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html

The -E flag has been supported by grep since its early versions, as it is part of the POSIX standard. Specifically:

  • grep -E was included in POSIX.2, which was ratified in 1992.
  • Any reasonably modern version of grep (even pre-GNU versions) supports -E.

Thus, using grep -E instead of egrep should be safe and backward-compatible change for almost all versions of grep in use.

@LukasFritzeDev LukasFritzeDev self-assigned this Nov 20, 2024
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4 participants
@Vinze @alfiosalanitri @LukasFritzeDev @MmeOokamy