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From: Lewis Butler <lbutler@covisp.net>
To: Zsh Users <zsh-users@zsh.org>
Subject: Parameter subsitution
Date: Fri, 8 Jan 2021 15:02:17 -0700	[thread overview]
Message-ID: <6B1D00CF-E282-49D3-8ABE-88AB8EBED62B@covisp.net> (raw)

Reading through the docs:

The s/l/r/ substitution works as follows. 
 [. . . ]
* A null l uses the previous string either from the previous l or from the contextual scan string s from ‘!?s’. 

And

* Note the same record of the last l and r is maintained across all forms of expansion.

Does this mean that l is recorded until the shell terminates or until a new l is used? Is there a way to see what the current l is set to?

$ file="/usr/local/tmp/filename.txt"
$ echo ${file:s|e|3}
/usr/local/tmp/fil3name.txt
$ echo ${file:s||4}
/usr/local/tmp/filename.txt

Doesn't look like the l is maintained?

And where is the !?s syntax defined?

Any examples of using !?s in anger?

-- 
ɹןʇnqן
<mailto:lbutler@covisp.net>
tel:+1.303.219.0564





             reply	other threads:[~2021-01-08 22:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-08 22:02 Lewis Butler [this message]
2021-01-08 22:25 ` Bart Schaefer
2021-01-08 22:31   ` Lewis Butler
2021-01-08 22:53     ` Bart Schaefer
2021-01-08 23:46       ` Lewis Butler
2021-01-09  0:00         ` Lawrence Velázquez
2021-01-09  0:49           ` Bart Schaefer
2021-01-09  1:09           ` Lewis Butler

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