corebinutils/sh/tests/parser/ps1-expand3.0


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# Test special parameter $$ (PID) in PS1
output=$(PS1='pid:$$:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1)
# Check that output contains "pid:" followed by a number (not literal $$)
case $output in
*pid:\$\$:*) echo "PID not expanded, got literal \$\$"; exit 1 ;;
*pid:[0-9]*) exit 0 ;;
*) echo "Expected PID after 'pid:' in output"; exit 1 ;;
esac