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://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10_02
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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