Hans-Bernhard Bröker via Cygwin wrote:
Am 04.07.2026 um 03:32 schrieb Annihilannic via Cygwin:
Firstly, why is =~ completely undocumented in the bash man page?
This question was my first encounter with the feature.
Because it's not --- not undocumented, that is. Manpage search can't
seem to find it, but it _is_ there.
Search for '\[\[ e' as the =~ is documented in the '[[ expression ]]'
section.
The =~ cannot be found because GNU troff translates U+007E ("Tilde")
into U+02DC ("Small Tilde"):
$ man bash | grep -c '=~'
troff:<standard input>:2073: warning: cannot select font 'CW'
...
troff:<standard input>:7242: warning: cannot select font 'CW'
0
$ zgrep -c '=~' /usr/share/man/man1/bash.1.gz
3
$ mman bash | grep -c '=~' # from package 'mandoc'
3
Using \[ti] instead would fix it, but may not be supported by all
formatters (it works with mandoc):
$ man groff_man_style
...
\[ti] Basic Latin tilde. Some output devices format “~” as U+02DC
(small tilde).
...
--
Regards,
Christian
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