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Full Discussion: Equivalence classes don't work
Top Forums Shell Programming and Scripting Equivalence classes don't work Post 303042153 by Scrutinizer on Monday 16th of December 2019 04:12:20 PM
Old 12-16-2019
It appears that it has been implemented in the system's regex engine, but that it does not work with globbing. On Linux, in bash 4 compare:
Code:
$ touch Miraré
$ for file in M*; do if [[ $file == M*[[=e=]]* ]]; then echo "$file"; fi; done
$ for file in M*; do if [[ $file =~ ^M.*[[=e=]] ]]; then echo "$file"; fi; done
Miraré
$

I found this for Linux Standard Base Core Specification 4.1: Pattern Matching Notation
Quote:
Utilities that perform filename pattern matching (also known as Filename Globbing) shall do it as specified in POSIX 1003.1-2001 (ISO/IEC 9945-2003), Pattern Matching Notation, with the following exceptions:

Pattern bracket expressions (such as [a-z]) can be based on code point order instead of collating element order.

Equivalence class expression (such as [=a=]) and multi-character collating element expression (such as [.ch.]) are optional.

Handling of a multi-character collating element is optional.

This affects at least the following utilities: cpio (cpio), find and tar (tar).
I do not know what is the case with Solaris 10. It may be that the equivalence classes were not specified in POSIX.1-2001 . Perhaps it was in Solaris 11, you would have to try that out...
Last edited by Scrutinizer; 12-16-2019 at 11:58 PM..
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