From: Marc Chantreux <eiro@phear.org>
Cc: Zsh-Users List <zsh-users@zsh.org>
Subject: dangerous behavior of while in zsh 5.6 ?
Date: Wed, 3 Oct 2018 16:38:00 +0200 [thread overview]
Message-ID: <20181003143800.GA9162@prometheus.u-strasbg.fr> (raw)
hello people,
i switched to 5.6.2 and was really happy to see the
improvement of the alternative syntax.
thank you so much zsh-workers! i mean it! zsh is just awesome.
but there is an inconsistency in the behaviour that
is very dangerous and hard to easily spot in a large script:
a end of line after a condition is interpreted as an empty
true block so:
while (( i-- ))
print $i
should mean:
while (( i-- )) {print $i}
actually mean:
while (( i-- )) {:}
print $i
so it doesn't behave like the other loops:
repeat 5 print $[i++]
while (( i-- )) print $i
works ...
repeat 5
print $[i++]
while (( i-- )) print $i
works ...
repeat 5
print $[i++]
while (( i-- ))
print $i
infinite loop. i think it's a bug. not sure :)
regards,
marc
next reply other threads:[~2018-10-03 14:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-03 14:38 Marc Chantreux [this message]
2018-10-03 15:28 ` Bart Schaefer
2018-10-03 16:25 ` Marc Chantreux
2018-10-03 17:47 ` Daniel Shahaf
2018-10-03 20:47 ` nat() in pure shell Marc Chantreux
2018-10-03 22:08 ` Daniel Shahaf
2018-10-03 23:23 ` Marc Chantreux
2018-10-08 10:38 ` Vincent Lefevre
2018-10-04 15:50 ` Bart Schaefer
2018-10-03 20:54 ` dangerous behavior of while in zsh 5.6 ? Bart Schaefer
2018-10-03 21:06 ` Marc Chantreux
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