< 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" useradd: user 'fs_user_0' already exists ? useradd "-s" "/bin/false" "fs_user_1" $ Released lock /tmp/fs_test/pw.lock 27949 creating agent 28694 27949 creating agent 28695 $ Acquired lock /tmp/fs_test/pw.lock ? useradd "-s" "/bin/false" "fs_user_2" useradd: user 'fs_user_2' already exists ? useradd "-s" "/bin/false" "fs_user_3" $ Released lock /tmp/fs_test/pw.lock 27949 stopping agent 28695 27949 stopping agent 28694 + userdel "fs_user_1" + userdel "fs_user_3"