| eject | Eject removable media |
| enable | Enable and disable builtin shell commands |
| env | Environment variables |
| ethtool | Ethernet card settings |
| eval | Evaluate several commands/arguments |
| exec | Execute a command |
| exit | Exit the shell |
| expand | Convert tabs to spaces |
| expect | Automate arbitrary applications accessed over a terminal |
| export | Set an environment variable |
| expr | Evaluate expressions |
| fdformat | Low-level format a floppy disk |
| fdisk | Partition table manipulator for Linux |
| fg | Send job to foreground |
| fgrep | Search files for lines that match a fixed string |
| file | Determine file type |
| find | Search for files that meet a desired criteria |
| fmt | Reformat paragraph text |
| fold | Wrap text to fit a specified width |
| for | Expand words, and execute commands |
| format | Format disks or tapes |
| free | Display memory usage |
| fsck | File system consistency check and repair |
| ftp | File Transfer Protocol |
| function | Define Function Macros |
| fuser | Identify/kill the process that is accessing a file |
| gawk | Find and Replace text within files |
| getopts | Parse positional parameters |
| grep | Search files for lines that match a given pattern |
| groupadd | Add a user security group |
| groupdel | Delete a group |
| groupmod | Modify a group |
| groups | Print group names a user is in |
| gzip | Compress or decompress named files |
| hash | Remember the full pathname of a name argument |
| head | Output the first part of files |
| help | Display help for a built-in command |
| history | Command History |
| hostname | Print or set system name |
| iconv | Convert the character set of a file |
| id | Print user and group id’s |
| if | Conditionally perform a command |
| ifconfig | Configure a network interface |
| ifdown | Stop a network interface |
| ifup | Start a network interface up |
| import | Capture an X server screen and save the image to file |
| install | Copy files and set attributes |
| jobs | List active jobs |
| join | Join lines on a common field |
| kill | Stop a process from running |
