Question

1

rated 0 times [ 1] [ 0] / answers: 1 / hits: 380 / 2 Years ago, sun, january 16, 2022, 7:15:22

How can I execute a program (specifically a bash alias) with the default environment variables?

Consider this example:

export test="something I dont want to exist"



alias _xterm='xterm -fn 7x13 -fa "Ubuntu Mono:size=12:antialias=false"'



_xterm

In the spawned xterm instance, the variable $test shouldn't be set.

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answered 2 Years ago nsuainner · Accepted Answer

env -i _xterm

A quick test harness:

$ export TMUX=3

$ bash -c 'echo $TMUX'

3

$ env -i bash -c 'echo $TMUX'

# nothing echos

Preserving $DISPLAY, $USER, etc:

$ env -i bash -c 'echo $DISPLAY'

# nothing

$ env -i DISPLAY=$DISPLAY bash -c 'echo $DISPLAY'

:0

Or you could explicitly exclude just some variables with the env -u option:

$ export TMUX=3

$ env -u TMUX bash -c 'echo $TMUX'

# nothing