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diff --git a/os/linux/linux-commands.md b/os/linux/linux-commands.md new file mode 100644 index 0000000..5c18f3b --- /dev/null +++ b/os/linux/linux-commands.md @@ -0,0 +1,68 @@ +#### 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 + ``` + |