Disable .zshenv output for non-interactive shell

Question

My .zshenv produces some output that is only helpful when my shell is interactive. In other cases when the shell is not interactive this output (i.e. when I run script) must be hidden.

How can I suppress .zshenv output for non-interactive shell?

P.S. I added my current solution below but it seems hackish to me.

Put the code in `.zshrc` instead of `.zshenv` if it doesn't do anything aside from produce the output. — chepner, Jun 21 '17 at 21:31
@chepner Thanks for advice, but actually I moved the code from `.zshrc` to `.zshenv` because it sets up environment both for interactive and non-interactive shell. — mixel, Jun 21 '17 at 21:40

score 1 · Answer 1 · answered Jun 20 '17 at 14:53

I added:

if [[ ! -o interactive ]]; then
    exec 1>&-
    exec 1<>/dev/null
fi

at the top of my .zshenv file to close original 1 stdout file descriptor and assign /dev/null to it.

And at the bottom I added:

if [[ ! -o interactive ]]; then
  exec 1>&0
fi

to restore it (see Reopen STDOUT and STDERR after closing them?).

score 0 · Accepted Answer · answered Jun 20 '17 at 19:06

My other answer does not work well in some cases.

I moved .zshenv content to a function run and added conditional redirection for this function output:

function run() {
    // .zshenv content
}

OUTPUT=1

if [[ ! -o interactive ]]; then
    OUTPUT=3
    eval "exec $OUTPUT<>/dev/null"
fi

run >& $OUTPUT

if [[ ! -o interactive ]]; then
   eval "exec $OUTPUT>&-"
fi

Disable .zshenv output for non-interactive shell

2 Answers2