Atlinx / linux-tools

Repository of tools + information for Linux environments 🐧

Linux Tools 🐧

Collection of various tools for working in a linux environment

Filepaths

Files and directories are accessed by file paths

./path/to/file

• A file path relative to your terminal's current directory

/path/to/file

• A file path relative to the root of your filesystem

Navigation

cd {directory}

• Changes directory of the terminal to directory
• Use .. to navigate to a parent directory

mkdir {directory_path}
rmdir {directory_path}

• Makes/removes a directory

cat {file_path}

• Inspects the contents of a file

rm {path}

• Removes a file or directory at path
• use -rf flags to recursive delete a directory that has contents

Installing packages

sudo apt-get update

• Updates the package registry so apt-get can install the latest packages

sudo apt-get install {package}

• Installs a package onto your machine

Locating files

whereis {application}

• Shows all locations relevant to an application

updatedb --prunepaths="/mnt/c"

• Updates the databased used for the locate command. Should be run before the locate command
• --prunepaths argument can hide paths, such as the Windows filesystem mnt in WSL

locate {filename}

• Searches the filesystem database made by updatedb for a filename

Links

Links are pointers to files

ln {file_path} {link_path}
ln -s {file_path} {link_path}

• Creates a hard link
  • Hard links point directly to the file contents
  • If you removing the original file after making a hard link, you can still access the file through the hard link
• Creates a soft link
  • Soft links point to the file path, which then points to file contents
  • Acts like a shortcut
  • If the original file is destoryed then the soft link is invalid and must be deleted

Services

Services are processes that run in the background of Linux. They can be configured with a .service file, which should be placed inside of /etc/systemd/system/.

NOTE:

You can also just create a symbolic link to the .service file and move the link inside of /etc/systemd/system

sudo systemctl status {service}

• Returns status of service

sudo systemctl stop {service}
sudo systemctl start {service}

• Stops/starts a service

sudo systemctl enable {service}
sudo systemctl disable {service}

• Enables/disables a service inside of /etc/systemd/system/

Postgresql

sudo apt-get install postgresql
sudo systemctl start postgresql

Postgresql has it's own cli called psql. To use it run

sudo -U postgres psql

• Connects to your local database with root user privledges

PSQL

You can execute Postgres SQL statements directly within PSQL cli.

• Postgres Cheatsheet

\q

• Exists the CLI

\conninfo

• Information about your connection to the database.
• Useful for finding the port it's hosted at.