Various shell commands that I always have to look up

shell_commands.sh

# Delete files based on a pattern
# The example below removes PDF files in nested directories, such as ./50/round_2/foo.pdf
# but would NOT remove the file ./50/packages/foo.pdf
find . -regextype posix-extended -regex ".*/round.*\.pdf" -exec rm {} +

# Delete a history item by its ID
history # get the ID (left-hand number) for the item you want to remove
history -d item_number

# Delete keys in redis matching some pattern, atomically
redis-cli KEYS "prefix:*" | xargs redis-cli DEL

# Delete files based on their modification time
# -mtime n is equivalent to saying "modified n*24 hours ago or before" (the + means "or before")
find . -mtime +90 -type f -print