Get folder size on OSX

Haruka had this problem, here is a simple solution
du -sh FOLDER_NAME

du (abbreviated from disk usage) is a standard Unix program used to estimate the file space usage—space used under a particular directory or files on a file system.

Finding in files

Finding a string in files is useful and not that straightforward. But don't despair, we have bash.

find . -exec grep -q 'foobar' '{}' \; -print

This searches in the current directory including its subdirectories and finds files that contain foobar.

Unix sort by column

Sort is a very useful unix utility. Simplest usage is here::

ls | sort

but that's not very interesting. Let's say we want to sort all the files by size:

ls -l | sort -k5 -n

What this command does exactly sort by 5th field using numeric order. Another useful option you may use is -t which allows you to select the field separator.