not sure if that's what you want, but you don't need a subshell to have temporary environment variables (at least in bash)

lanx@lanx-1005HA:~$ echo $a,$b
0,0
lanx@lanx-1005HA:~$ a=666 b=42 perl -e 'print "@ENV{a,b}\n"' 
666 42
lanx@lanx-1005HA:~$ echo $a,$b
0,0

[download]

please note the "missing" semicolon!

update

and the vars don't seem to show up in the process list, though I'm no expert there

lanx@lanx-1005HA:~$ ps -edaf |grep perl
lanx      2731  2174  0 18:02 pts/2    00:00:00 perl -e print "@ENV{a,
+b}\n";sleep 100

[download]

Anyway they'll be in the bash history.

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

In reply to Re: Set env variables as part of a command by LanX
in thread Set env variables as part of a command by devilock76

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