Command line magic Cheat Sheet - much used but not remembered

Command line magic Cheat Sheet

# Search & replace over multiple files (Linux)
find . -type f -print0 | xargs -0 sed -i 's/foo/bar/g'
# Search & replace over multiple files (Mac OS X)
find . -type f -print0 | xargs -0 sed -i '' -e 's/foo/bar/g'

# remove empty files in a directory
find /tmp -size  0 -print0 |xargs -0 rm

# Run command in multiple directories
for dir in ./*; do (cd "$dir" && echo "$dir" && cowsay "boo"); done

# SSH: bind remote port  ([bind_address:]port:host:hostport)
ssh -L 3306:localhost:3306 [email protected]

# Xdebug on vagrantbox
ssh -R 9000:localhost:9000 [email protected]

# Write disk image to SD-card
df -h
sudo umount /dev/mmcblk0p1
xzcat ~/Downloads/img-file.img.xz | sudo dd bs=4M of=/dev/mmcblk0
sudo watch kill -USR1 $(pgrep ^dd) # monitor progress
sync

# Rename jpg files based on EXIF data
find . -iname '*jpg' -exec jhead -n%Y%m%d-%H%M%S {} +

# Convert HEIC image file to jpg
magick convert foo.HEIC foo.jpg

# bulk convert multiple HEIC images to jpg
magick mogrify -monitor -format jpg *.HEIC