Command-line Knowledge Base

Brace/Parameter Expansion
Commands to get private IP address
Create file using current date
Copy latest iso to USB key
Check to see if data storage device is solid state or electro-mechanical
Symbolic link between two folders with different names
Use ImageMagick to resize images
Use ImageMagick to get image dimensions
Use ImageMagick's Mogrify to convert webp images
Use ImageMagick to get camera info
Copy multiple files to a folder in one command
Use youtube-dl to extract audio in mp3 format from Youtube videos
Scan network for IP address
Use ffmpeg to extract audio from *.mkv and convert to mp3
Use ffmpeg to trim video
Get storage device model info
Use find to search for folders/files based on modification date/time
Use find to show files modified on a specific date
Use netstat to print active connections
Use findmnt to display free and used space of mounted filesystems
Use hostname to get IP address
Single line conditional statement
Show Apache error messages just for my machine
Use fmt to reformat text sent to standard output from a file
Listen to white noise/pink noise using SoX
run0 replacement for sudo
NULL

AWK
bc (basic calculator)
cat
comm
cron
date
dd
find
rename
sed
seq
grep
tar
pdfgrep
ncal
pcregrep
torsocks
NULL

PDFtk