Re: the usage of env
In addition to what everyone else has said about env(1), there is the
fact that Korn derived shells also supports some of the same features.
env VAR1=foo VAR2=bar random-command
VAR1=foo VAR2=bar random-command
If running a Korn-like shell (ksh, bash, zsh), both would set the
envvars VAR1 and VAR2 to those values. (Note: I don't *think* earlier
Bourne shells support that, but I may be misremembering when the
feature was introduced. It was likely before even my time.)
However, C-shell derived do not, you must use the env(1) command.
But, env(1) does also offers the -i and -u flags to initialize and
unset envvars. I use -u a lot during dev/testing to make sure scripts
I write work correctly in various combinations.
mrc
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