From 22c21566fb15e1258c747d2e269e46710ddb98a6 Mon Sep 17 00:00:00 2001
From: srdusr <graytrevor98@gmail.com>
Date: Thu, 12 Oct 2023 23:38:58 +0200
Subject: Moved linux to new directory 'os'

---
 os/linux/linux-commands.md | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 os/linux/linux-commands.md

(limited to 'os/linux/linux-commands.md')

diff --git a/os/linux/linux-commands.md b/os/linux/linux-commands.md
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+#### 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 .`  
+- - -
+
+#### 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  
+- - -
+
+#### Listing all users on system
+  ``` bash 
+  $ cat /etc/passwd 
+  ``` 
+
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