1# Test positional parameter $0 in PS1 2output=$(PS1='shell:$0:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1) 3# $0 should contain the shell name/path 4case $output in 5*shell:\$0:*) echo "Positional parameter not expanded, got literal \$0"; exit 1 ;; 6*shell:*sh*:*) exit 0 ;; 7*) echo "Expected shell name after 'shell:' in output"; exit 1 ;; 8esac 9