SystemTools

Shortcuts

Auto-Complete

[TAB] - Initiates auto-complete. This will suggest to us different options based on the STDIN we provide.

Cursor Movement

[CTRL] + A - Move the cursor to the beginning of the current line.
[CTRL] + E - Move the cursor to the end of the current line.
[CTRL] + [←] / [→] - Jump at the beginning of the current/previous word.
[ALT] + B / F - Jump backward/forward one word.

Erase The Current Line

[CTRL] + U - Erase everything from the current position of the cursor to the beginning of the line.

[Ctrl] + K - Erase everything from the current position of the cursor to the end of the line.

[Ctrl] + W - Erase the word preceding the cursor position.

Paste Erased Contents

[Ctrl] + Y - Pastes the erased text or word.

Ends Task

[CTRL] + C - Ends the current task/process by sending the SIGINT signal. For example, this can be a scan that is running by a tool. If we are watching the scan, we can stop it / kill this process by using this shortcut. While not configured and developed by the tool we are using. The process will be killed without asking us for confirmation.

End-of-File (EOF)

[CTRL] + D - Close STDIN pipe that is also known as End-of-File (EOF) or End-of-Transmission.

Clear Terminal

[CTRL] + L - Clears the terminal. An alternative to this shortcut is the clear command you can type to clear our terminal.

Background a Process

[CTRL] + Z - Suspend the current process by sending the SIGTSTP signal.

Search Through Command History

[CTRL] + R - Search through command history for commands we typed previously that match our search patterns.
[↑] / [↓] - Go to the previous/next command in the command history.

Switch Between Applications

[ALT] + [TAB] - Switch between opened applications.

Zoom

[CTRL] + [+] - Zoom in.
[CTRL] + [-] - Zoom out.

Trace a System call:

#trace #systemcall
For example, to trace the system calls made by the Apache web server process, we can use the following command:

sudo strace -p `pgrep apache2`

Process Mapping

The lsof command is a powerful utility that lists all the files opened by a process, including network sockets and other file descriptors, that we can use in Debian distributions like Ubuntu. We can use lsof to list all the files opened by a process. For example, to list all the files opened by the Apache web server process, we can use the following command:

sudo lsof -c apache2

Vim shortcuts:

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