Common Commands
Help Commands
| Command |
Description |
| compgen -c | Show all commands |
| compgen -a | Show all alias commands |
| compgen -A function | Show available functions |
| man <command> |
Show manual page of a command (more info than --help) |
| <command> --help |
Show help page of a command (less info than man command) |
| <command> --version |
Show version of a command |
File & Folder Commands
| Command | Description |
| ls -lah |
List files/folders in current directory (+infos) |
| mkdir newdir |
Create a new folder |
| cd somefolder |
Change/switch to another directory |
| cp file.txt file-copy.txt |
Copy a file |
| mv file.txt file-renamed.txt |
Rename a file |
| mv file.txt /tmp |
Move file to another folder |
| rm file.txt |
Remove a file |
| rm -rf folder |
Remove entire folder (recursive) |
| ln -s original target |
Create a symlink |
| pwd |
Show path of current folder |
| chown <arguments> <user>:<group> file.txt |
Change Owner and Group of file (use -R for rekursive) |
Search & String Commands
| Command | Description |
| find . -name file.txt |
Search for a file (recursive) |
| grep -rin "search string" |
Search for a string in current folder (recursive) |
| grep -rin "search string" | cut -c 1-100 |
Search for a string in current folder + limit output of string |
| sed -Ei 's/someString/newString/g' file.txt |
Replace "someString" with "newString" in a file |
| head file.txt |
Show first 10 lines of file |
| tail file.txt |
Show last 10 lines of file |
| cat file.txt |
Show full content of file |
| cat file.txt | grep "search string" |
Pipe output of "cat" command to grep + filter string |
OS Helper Commands
| Command | Description |
| du -csh . |
Show size of current folder |
| df -h |
Show partitions / drives |
| lsb_release -a |
Show OS Version / Informations |
Remote / Host Commands
| Command | Description |
| wget https://www.somewhere495848.com/test.txt |
Download a file |
| curl -LI https://www.google.com |
Show Header Informations of URL |
| whois <host> |
Show NS, DNS, Register about a host (e.g.: whois google.com) |
| host <host> |
DNS Lookup of a host (e.g.: host google.com) |
| dig <host> |
DNS Lookup of a host (verbose) (e.g.: dig google.com) |
| rsync -avz myfolder somehost:/var/www/ |
Sync a folder to a remote host and specific path |
| rsync -avz somehost:/var/www/ . |
Sync from remote host and specific path to local folder |
| rsync -avz <dirSource> <dirTarget> | Sync entire Folder (locally) |
| rsync -avz <dirSource>/ <dirTarget> | Sync only contents of folder (locally) |
Command-Line Operators
| Command | Description |
| <command> > file.txt |
Write output of a command into a file (creates/overwrites file) |
| <command> >> file.txt |
Write output of a command into a file (appends at end of file) |
| <command1> && <command2> |
Do command2 only if command1 succeeds |
| <command1> || <command2> |
Do command2 only if command1 fails |
| <command1> | <command2> |
Pipe command1 output into command2 |
| ! |
Negation Operator (e.g. find . ! -user "root") |
| More about operators: linux-command-operators |
Other helpful Commands
| Command | Description |
| htop |
Very helpful utility to show all process, cpu, ram, .. |
| ps aux | grep http |
Show processes who accesses http |
| which <command> |
Show path location of a command |
| history | tail |
Show last 10 lines of your history (commands) |
| bash myCustomScript.sh |
Execute a custom shell script |
| tar -cvf file.tar myfolder |
Create a compressed tar file of a folder |
| tar -xvf file.tar |
Extract a compressed tar file |
| zip -r file.zip myfolder |
Create a compressed zip file |
| unzip file.zip |
Extract a compressed zip file |