On Mon, Apr 12, 2021 at 10:18:19AM -0500, David Wright wrote: > I'm not using PS1 to test whether stdout is a terminal, but whether > the file is running interactively. From man bash: > > "PS1 is set and $- includes i if bash is interactive, allowing a > shell script or a startup file to test this state.
The second half of that sentence is referring to the $- part. That's what you're supposed to test to see whether the shell is interactive. # bash if [[ $- = *i* ]]; then echo "I am an interactive shell" echo # sh case $- in *i*) echo "I am an interactive shell" ;; esac
