Thanks for sharing this! TIL!
Chris Gauthier Senior Network Engineer | Comscore
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-----Original Message-----
From: "Piegorsch, Weylin William" <wey...@bu.edu>
Date: Tuesday, June 18, 2019 at 2:03 AM
To: Jean Benoit <j...@unistra.fr>
Cc: "Gauthier, Chris" <cgauth...@comscore.com>, Michael Newton
<mnew...@pofp.com>, Vacheslav Zouhairy <m_zouha...@skno.by>,
"rancid-discuss@shrubbery.net" <rancid-discuss@shrubbery.net>
Subject: Re: [rancid] Unable to figure out "end of run not found"
> you can even put redirects
That's a neat trick!!! I'll have to remember that one; thanks!
__
weylin
On 6/17/19, 5:27 PM, "Jean Benoit" <j...@unistra.fr> wrote:
On Mon, Jun 17, 2019 at 09:05:13PM +0000, Piegorsch, Weylin William wrote:
> I actually don't use the semicolon.
> Not sure if this is bash specific, sh specific, or posix general, but
> without the semicolon it sets the global environment variable only for the
> duration of that command following the variable definition, and unset it
> upon returning control to the cli. See also your "export" comment, which
> has correlating implications regarding environment vs namespace vs scope.
> But I'm not an experienced programmer, and don't pretend to grok the
> various nuances, benefits, and pitfalls known by those who actually know
> what they're doing, so if using the semicolon is better I all ears.
You are right: ; is not necessary.
NOPIPE=yes rancid -d -t type devicename
is is a perfectly valid syntax according to POSIX Shell Grammar Rules.
It works with bash, dash, ksh, zsh and other shells.
https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fpubs.opengroup.org%2fonlinepubs%2f9699919799%2futilities%2fV3_chap02.html%23tag_18_10_02&c=E,1,pVeiRZ33eh0bANTtrPcyWLXgDYYcEhv1fVgAMKs-rqhpxiQGGKwtaHnc1ENunuBCFwIl6XJo0fGwJdkcHgduuUt2gpDkO7h_-c4J99skKxG0vy0,&typo=1
see "simple_command" syntax and rule 7, which defines "ASSIGNMENT_WORD".
simple_command : cmd_prefix cmd_word cmd_suffix
| cmd_prefix cmd_word
| cmd_prefix
| cmd_name cmd_suffix
| cmd_name
cmd_prefix : io_redirect
| cmd_prefix io_redirect
| ASSIGNMENT_WORD
| cmd_prefix ASSIGNMENT_WORD
You don't need the ; and you dont need export, and you can even put
redirects, as long as assignments are before the command.
Example :
XYZ=foo </tmp/x >/tmp/y A=1 B=bar mycommand myarg
--
Jean
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