Linux
Linux is a family of open-source Unix-like operating systems based on the Linux kernel.
Index
File System
Shell
Redirect stdout to a file.
command > out
Redirect stderr to a file.
command 2> error
Redirect stdout to a file and stderr to stdout.
command > out 2> &1
| Command | Description |
|---|---|
| cd | Change directory. |
| clear | Clear the console. |
| ls ls -l ls -a |
List files and directories. |
| lsb_release -d | Show Ubuntu version. |
| mpstat -P ALL | Monitor CPU. |
| nvidia-smi | Monitor NVIDIA GPU. |
| ps ps -aux |
Show processes. |
| ps -aef --forest | Show the tree of processes. |
| scp -r file user@ip:path | Secure copy files or directories between 2 computers. |
| shutdown -h now | Shutdown the machine. |
| sudo su - | Switch to superuser. |
| top | Monitor processes. |
| watch -n interval | Run command at regular intervals. |
Environment Variables
Environment variable with command scope.
FOO=bar command
FOO=bar; command
export FOO=bar
command
unset FOO
Environment variable with terminal scope.
export FOO=bar
command0
command1
...