Bash Check If Shell Is Interactive or Not Under Linux / Unix Oses

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You can check if the shell is interactive or not by checking the value of the -o option of the PS1 environment variable:

if [ "${-#*i}" != "$-" ]; then
echo "Interactive shell"
else
echo "Not an interactive shell"
fi

In this example, "${-#*i}" expands to the value of the $- variable with the first occurrence of the i character removed. If the shell is interactive, the i character will be present, and the expansion will be different from the original value of $-. If the shell is not interactive, the i character will not be present, and the expansion will be the same as the original value of $-.

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