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Copy an element from the previous command
'n' is a non-negative integer. Using 0 will expand to the name of the previous command.

m4a to mp3 conversion with ffmpeg and lame
A batch file version of the same command would be: for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -ab 256k "${f%.m4a}.mp3"; done

Check Ram Speed and Type in Linux
from http://maysayadkaba.blogspot.com/2008/08/linux-check-ram-speed-and-type.html

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

printing barcodes
64 elements max on 16 rows, 4 cols. GNU Barcode will adapt automagically the width and the eight of your elements to fill the page. Standard output format is PostScript.

remove empty lines in place with backup
Modify file in place to remove empty lines and create a backup of the original with the extension .bak

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Backup with versioning

check open ports without netstat or lsof

Copy the full path of a file to the clipboard (requires xclip or similar)
Handy for those times you need to paste a file path in an IDE or some other app. sudo apt-get install xclip Then, for convenience, alias xclip to 'xclip -selection c' so you can just do something like realpath . | xclip


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