#### Job Control

- List jobs, job_id is the numerical value of the job  
  `$ jobs`
- suspend job into background, similar to pause so that one can can do something else  
  `<Ctrl-Z>`
- Can resume it's running in the background by:  
  `$ bg <job_id>`
- Bring it back to foreground by inserting:  
  `$ fg`
- Or in case of multiple jobs:  
  `$ fg %<job_id>`
- To suspend the process running in the background, use:  
  `$ kill -STOP %job_id`

---

#### Copying/Moving/Renaming Files/Directories

- Shorter syntax to copy/move from/to current file path (current working directory) `$(pwd)`  
  NOTE: `.` can also be used but is limited  
   `$ cp -r $(pwd)/path-to/file ~/new/path/`  
   `$ mv -r ~/another/directory/file .`
- Copy/move all files of a directory to another  
  `$ cp -a /directory/. /destination`

---

#### Copying/Pasting Text

- Copy text/output of a command into a file (useful if in putty/non graphical terminal emulator)  
  `$ <command> 2>&1 | tee -a output.txt`  
  or  
  `$ echo "text" 2>&1 | tee -a output.txt` # print text without executing a command

---

#### Recall the Previous Command

- Use `!!` to express the last command  
   For example if a command needs root permissions:

  ```bash
  $ touch /opt/file.txt
  touch: cannot touch '/opt/file.txt': Permission denied
  $ sudo !!
  sudo touch /opt/file.txt
  [sudo] password for user:
  $ ls -l /opt/myFile.txt
  -rw-r--r-- 1 root root 0 Dec  21 16:20 /opt/file.txt
  ```

      `!!:n` where n is the 0-based position of the argument you want.

  The ! prefix is used to access previous commands.

- Other useful commands:

  `!$` - last argument from previous command  
   `!^` - first argument (after the program/built-in/script) from previous command  
   `!*` - all arguments from previous command  
   `!!` - previous command (often pronounced "bang bang")  
   `!n` - command number n from history  
   `!pattern` - most recent command matching pattern  
   `!!:s/find/replace` - last command, substitute find with replace

---

#### Getting information about a window

- To get id, size, position, state, class, etc...  
  `$ xwininfo`  
  or  
  `$ xdotool getwindowfocus getwindowgeometry` # just get size/position

---

#### Getting information about current display/session

- Check session type  
  `$ echo $XDG_SESSION_TYPE`
- Check current display
  `$ echo $DISPLAY`
  > NOTE: Only works in x11
- Get Virtual Terminal Number (VTNR), useful when dealing with console sessions  
  `$ echo $XDG_VTNR`

---

#### Listing all users on system

```bash
$ cat /etc/passwd
```