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this && that || the other && this too
- X-seq: zsh-workers 3556
- From: ramos@xxxxxxxxxxxxxxxxxxxx
- To: zsh-workers@xxxxxxxxxxxxxxx
- Subject: this && that || the other && this too
- Date: Tue, 7 Oct 1997 19:47:51 -0500
hello zsh developers! Congrats on a very nice job.
I found a "problem" that perhaps some interested volunteer
would care to look into.
Consider it a special exercise for those who thought zsh
already implements all shell features that can possibly be
implemented :-)
Apparently there is no way to construct an expression
using "&&" and "||" of the form:
cmd1 XX cmd2 XX cmd3
such that both cmd2 and cmd3 execute when cmd1 succeeds,
and neither cmd2 nor cmd3 execute when cmd1 fails.
examples that do not work:
% echo yo && true || echo A || echo B
yo
% echo yo && false || echo A || echo B
yo
A
% echo yo && true || echo A && echo B
yo
B
% echo yo && false || echo A && echo B
yo
A
B
"It would be nice" to be able to do this without using ()'s, or
if/then/fi, or some other contorted workaround.
Thanks,
Alex Ramos
atramos@xxxxxxxxxx
% echo $ZSH_VERSION
3.0.5
% uname -a
SunOS ihnns581 5.5.1 Generic_103640-09 sun4u sparc SUNW,Ultra-1
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