| alias | allows you to set aliases and view the current aliases |
| awk | search for a pattern within a file. |
| badblocks | searches a device for bad blocks. |
| bg | move a job running in the foreground to the background. |
| bzip2 | used to compress and decompress files. Similar to gzip. |
| cp | copy |
| chattr | changes the attributes of a file or folder. |
| chroot | change the root directory for a command. |
| chmod | used to change permissions on a directory or file. |
| chown | used to change the owner of a file or directory. |
| chgrp | used to change the group a file belongs to. |
| clear | clears the screen |
| cpio | copies file. |
| cat | displays the content of a file |
| cd | changes directories. |
| cron | used to execute commands at a certain time. |
| crontab | allows you to view or edit the current cron jobs. |
| date | prints current date to the screen |
| du | lists disk usage in a directory. |
| df | reports disk usage information. df -h |
| edquota | sets quotas for specific users. |
| env | lists current environment variables. |
| fdisk | used to create/edit/delete partitions. |
| fsck | checks a file system for consistency. |
| fg | used to send jobs to the background. |
| fuser | checks to see what processes and users have open files. |
| find | searches for a file. |
| free | will show total memory, used memory, and free memory. |
| gpasswd | used to set a password for a group. |
| grep | used to search through a file for a specified pattern. |
| gunzip | uncompress files compressed by gzip. |
| head | displays the first 10 lines of a file to the screen. |
| hdparm | gets disk information. |
| history | lists recently executed commands. |
| host | used to get DNS info. |
| id | display information about yourself or another user. |
| jobs | used to show jobs running in the background. |
| join | join lines of two sorted. |
| kill | used to kill a process. |
| killall | kill processes by command name. |
| kernelcfg | a graphical application configures Linux. |
| klogd | control which kernel messages. |
| linuxconf | command line GUI which lets you configure your linux |
| ls | displays a directories contents. |
| ln | used to create hard and symbolic links. |
| less | display the contents of a file |
| ldd | shows what shared libraries a program is dependent on. |
| ldconfig | used to configure/view shared libraries. |
| last | lists logins and reboots. |
| lastlog | print the last login times for system accounts. |
| lsmod | lists loaded modules. |
| lsattr | lists the attributes for a file or folder. |
| mount | used by itself, reports the currently mounted files. |
| modinfo | give info about the module. |
| modprobe | queries modules. |
| man | displays the Man page for a given command. |
| mkdir | make directory |
| mv | move/Rename |
| merge | merge multiple files together. |
| more | lets you page through text one screen full at a time. |
| nice | used to set process priorities. |
| nslookup | used to get DNS info from name servers. |
| netstat | shows active sockets. |
| ps | displays current processes |
| ping | used to test connectivity between two hosts. |
| pwd | present Working Directory |
| rm | remove |
| rmdir | remove directory |
| rpcinfo | used to see what rpc services are available. |
| route | used to view/change routes between you and other hosts. |
| smbclient | used to connect to Windows shares or Samba. |
| smbadduser | maps linux user names to Windows NT user names. |
| smbpasswd | used to update the smbpasswd file with new accounts. |
| set | used to read and write variables. |
| setquota | used to set disk quotas. |
| sort | sorts lines in a file by alphabetical order. |
| su | change to Super User (root). |
| shutdown | shutdown machine |
| showmount | shows mount information for an NFS server. |
| swapon | turns on the swapfile. |
| swapoff | turns off the swapfile. |
| testparm | used to troubleshoot Samba. |
| tar | used to compress multiple files. |
| tac | view a file from the last line up. |
| touch | creates an empty file. |
| tail | displays the last 10 lines of a file to the screen. |
| tr | converts one set of characters to another. |
| traceroute | used to track the path a packet takes to a host. |
| top | shows information about the most CPU-intensive Apps. |
| umount | removes a device from the filesystem. |
| uname | determines OS name, version and machine name. |
| vmstat | lists information on memory usage. |
| whereis | finds documentation files. |
| who | tells you who is logged into your server. |
| whoami | tells you your user information. |
| wc | print the number of bytes, words, and lines in files |
| which | finds the full path for a command. |
| zcat | read files that have been compressed with gzip. |