add batch extensions to files

for f in *; do mv " $f" "$ f.txt"; done

lists one file per line

ls -1a

list files and their path

ls -d -1 "$PWD/".

see https://stackoverflow.com/a/3572628

find files and order by date

find ~/ -type f -name "*.key" 2> /dev/null | xargs -0 ls -tl

check stockage via terminal

df -h

du -h /my/folder

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