shellcheck: test_switch_id.sh issues
In test_switch_id.sh line 3:
if test "`id -u`" != '0'; then
^-- SC2006: Use $(..) instead of legacy `..`.
In test_switch_id.sh line 8:
if test "`id -u nobody`" = ""; then
^-- SC2006: Use $(..) instead of legacy `..`.