< id -u -n < id -g -n < uname -s + mkdir "-p" "/tmp/fs_test" $ Acquired lock /tmp/fs_test/pw.lock ? useradd "-s" "/bin/false" "fs_user_0" $ Released lock /tmp/fs_test/pw.lock 3389 creating agent 4120 3389 creating agent 4121 $ Acquired lock /tmp/fs_test/pw.lock ? useradd "-s" "/bin/false" "fs_user_1" $ Released lock /tmp/fs_test/pw.lock 3389 stopping agent 4121 3389 stopping agent 4120 + userdel "fs_user_0" + userdel "fs_user_1"