Based on the material provided by Read Hat in Red Hat System Administration I and Red Hat System Administration II courses.
| Command | Meaning | Possible Output |
|---|---|---|
ssh remoteuser@remotehost |
virtually login | |
exit |
Logout | |
passwd |
Password change | |
whoami |
username | |
date +%R; date +%x |
Time and date | 19:13 03/29/2022 |
date +%r |
Current time in 12-hour clock time | |
file /etc/passwd |
Scan file content and return what type the content is | ASCII |
cat /etc/passwd cat file 1 file 2 |
* Create a file in the folder * Concatenate the contents from multiple files * Redirect contents of the file to a terminal or files. |
|
head and tail |
Display the beginning and the end of a file | |
wc |
* Counts lines, words, characters * -l, -w, or -c option to display only the number of lines, words, or characters, respectively. |
|
history |
List of previously executed commands | |
cd .. |
cd .. command uses the .. hidden directory to move up one level to the parent directory | |
mkdir |
Create a directory | |
cp file new-file |
Copy file | |
cp -r directory new-directory |
Copy directory and its contents | |
mv file new-file |
Move or rename a file or directory | |
rm file |
Remove a file | |
rm -r directory |
Remove a directory containing files | |
rmdir directory |
Remove an empty directory | |
ls -al |
Redirect all contents to a file named e.g. 'editing_final_lab' | ls -al > editing_final_lab.txt |
vim |
edit file using vim | vim editing_final_lab.txt |
echo |
Append to a file | echo " ---" |
man |
Display the user manual of any command that we can run on the terminal | |
pinfo |
Launch info document viewer | |
ls -l / ls -ld |
View the owner of a file / view the owner of a directory | |
su |
Switch user |
| Shortcut | Meaning |
|---|---|
| Alt+F2 | Enter a Command and enter gnome-terminal |
| Windows+L | Lock the screen |
| Ctrl+A | Jump to the beginning of the command line. |
| Ctrl+E | Jump to the end of the command line. |
| Ctrl+U | Clear from the cursor to the beginning of the command line. |
| Ctrl+K | Clear from the cursor to the end of the command line. |
| Ctrl+LeftArrow | Jump to the beginning of the previous word on the command line. |
| Ctrl+RightArrow | Jump to the end of the next word on the command line. |
| Ctrl+R | Search the history list of commands for a pattern. |
| Ctrl+V | Enter line-based visual mode |
| x | Delete |
| v | Select characters on single-line only |
- If you want to type more than one command on a single line, use the semicolon
;; \to ignore the meaning of the character;!is a metacharacter that is used to expand previous commands without having to retype them;