show the disk usage of tagged cache directories
du -h --total (dirname (find . -name CACHEDIR.TAG))
useful for totaling rustc compilation caches
remove tagged cache directories older than 3 days
dirname (find . -mtime +72 -name CACHEDIR.TAG) | xargs rm -r
always test your mass deletion commands without rm in order to see what they will delete
send notification when the running command finishes
fg; notify-send 'done'
ctrl-z in a terminal will pause the currently running command.
fg
will resume the command and wait until it is finished.
redirect both stdout and stderr to a file
somecommand &>/dev/null
for each submodule that does not have local changes, update it and discard all but the latest commit.
git submodule foreach sh -c 'git log --branches --not --remotes --format=%H | wc -l | grep -F "0" && git fetch --depth=1 && git reflog expire --expire=all --all && git gc --prune=now; true'