Find

File types

Find file types in directory

find . -type f | perl -ne 'print $1 if m/\.([^.\/]+)$/' | sort -ub

List file count and sizes grouped by extension

find . -name '?*.*' -type f -print0 | perl -0ne 'if (@s = stat$_){ ($ext = $_) =~ s/.*\.//s; $s{$ext} += $s[12]; $n{$ext}++; } END { for (sort{$s{$a} <=> $s{$b}} keys %s) { printf "%15d %6d %s\n",  $s{$_}<<9, $n{$_}, $_; } }' | numfmt --to=iec-i --suffix=B

Largest files

find . -type f -exec du -Sh {} + | sort -rh | head -n 10

Clean up

Delete node_modules recursively

find . -name 'node_modules' -type d -prune -exec rm -rf '{}' +

Search for duplicates in two directories

Sorted by filename

fdupes --recurse --size --time --order=name ./folder1/ ./folder2/ > fdupes-sort-by-name.txt

File permissions

Show linux file permissions in numeric format (e.g. 755)

find . -maxdepth 1 -printf "%m %f\n"

Last change

All files changed in the last 3 minutes in your home

find ~ -mmin -3 -ls

Show all files changed within the last year

find . -ctime -365

Show all files which are older than one year

find . -ctime +365

Create an old file for testing

touch -mt 200501011400 old_file

Use mtime instead of ctime

find . -mtime -365

Filter by pattern

Show only folders containing at least one file matching a pattern

find . -iname "dsc_*" -printf "%h\n" | sort -u

Find string in files

grep

grep -iRs --exclude-dir=node_modules --exclude-dir=dist --exclude-dir=build --exclude-dir=.git --exclude=package-lock.json "string" .