Truncate files to zero length

When using the screen tool you may be unable to start a screen session but instead encounter an error:

Cannot open your terminal '/dev/pts/0' - please check.

This is because another user (you) initiated the current terminal -- you probably...

Grep prints one line per match. To return the number if matches, use the -c switch:

grep -c "something" filename

However, if a word appears more than once in a line, it is only counted once.

To count every match, you can use [sed](http:...

Call geordi clean from a project root to remove unused and unnecessary files inside it.

This script is part of our geordi gem on github. In Geordi > 1.2 you can call geordi clean.

If you want to manually check if e-mail delivery works on a machine by sending an e-mail you can run the following:
mail -s Test someone@example.com < /dev/null

This will send an empty e-mail with "Test" as its subject to `someone@example.com...

If you need to find all files inside a directory that were modified in the last 24 hours you can do this:

find . -mtime 1

You can also refer to another file's timestamp like this:

find . -cnewer other_file

This can be used to check aga...

When you need to bulk rename files you can not call "mv *.foo *.bar" to change the extension of all .foo files to bar (because bash resolves wildcards and replaces them with the list of matched files).

This works on linuxes who use the ...

I recently noticed that better_errors allows you to to open files from within your favorite editor. However it was not so easy to get rubymine:// links to work ...

Let's say you have a folder images and want to to move all files in there to a new subfolder public.

cd images
mkdir public
mv !(public) public

The !(public) excludes the new subfolder itself from being moved.

When you drag a file from a Nautilus window into a terminal window, the file's path will be pasted into the terminal. This also works with multiple files.

From the shell:

ls -l | wc -l