Linux

7 - 111 || 6 - 110 || 5 - 101 || 4 - 100 || 3 - 011 || 2 - 010 || 1 - 001 || 0 - 000.

CommandDescriptionExamplecatDisplay contents of file$ cat /etc/passwdpwdPrint working directory$pwdlsList contents of current directory$lscdChange directory$cd /homewhoamiPrint effective userid$whoami