Checking disk usage and free disk space

To check your machine’s disk usage and see how much free space is left, you can run the following command in your terminal:

df -h

This lists all the filesystems mounted on your machine, where they are located, their size, how much storage space is used, and how much storage space is available.

For me, this reported that my root filesystem was 100% full!

Source: https://www.howtogeek.com/409611/how-to-view-free-disk-space-and-disk-usage-from-the-linux-terminal/

Auto-removing unnecessary dependencies

When installing a dependency on a Linux machine, it’s common to use APT, the Advanced Package Tool. Over time, it’s possible that you may have packages installed that you no longer need. To auto-remove any unnecessary dependencies you may have installed, you can run:

sudo apt-get autoremove

Source: https://askubuntu.com/questions/527410/what-is-the-advantage-of-using-sudo-apt-get-autoremove-over-a-cleaner-app

Cleaning up cached packages

It’s also helpful to clean up the package files stored in the /var/cache directory on your machine. You can do so by running this command:

sudo apt-get clean

Source: https://www.networkworld.com/article/3453032/cleaning-up-with-apt-get.html

Finding and deleting files with filenames that match a pattern

Back in my early days of using Git, I didn’t fully understand the value of the .gitignore file, which tells Git to, well, ignore certain files or directories. Because I failed to use this file to my advantage, I had plenty of files like .DS_Store or NPM debug logs taking up space on my machine.

To find all the .DS_Store files in all subdirectories on my machine, I ran:

find . -name ".DS_Store"

This lists all the matching files but doesn’t do anything with them. It’s more of a dry run. If you want to then delete those files, you can run the same command but pass it the -delete flag like this:

find . -name ".DS_Store" -delete

Because these files were also still in my source control due to not listing them in the .gitignore file, I also needed to commit and push this change as well as modify my .gitignore file to ignore these pesky files.

Source: https://unix.stackexchange.com/questions/3672/how-do-i-delete-all-files-with-a-given-name-in-all-subdirectories

Displaying all sub-directories and their sizes, sorted by size

I wanted to see which of my many projects were taking up the most space. To find that list, I ran the following command, which goes through all of the sub-directories from within your current directory, sorts them from largest to smallest, and prints their size in a human-readable format:

du -hs * | sort -hr

Source: https://superuser.com/questions/554319/display-each-sub-directory-size-in-a-list-format-using-one-line-command-in-bash

sudo find / -type f -size +50M -exec ls -lh {} \;

Lenguaje de código:  Bash  ( bash )

Lenguaje de código:  Bash  ( bash )

Lenguaje de código:  Bash  ( bash )

Lenguaje de código:  Bash  ( bash )

find /var/log -type f -name “*.gz” -delete
find /var/log -type f -name “*.log.*” -delete
find /var/log/ -type f -name “*.1” -delete

Example: nano clean_logs_files.sh

#!/bin/bash
#

find /var/log -type f -name “*.gz” -delete
find /var/log -type f -name “*.log.*” -delete

#empty logs text into *.log
find /var/log/ -type f -name “*.log” -exec tee {} \; </dev/null

#empty content in specify & custom files
tee /var/log/dmesg </dev/null
tee /var/log/firewalld </dev/null
tee /var/log/lastlog </dev/null
tee /var/log/mail.err </dev/null
tee /var/log/syslog </dev/null