Wrong operator for string comparison

`test` doesn't know about `==`.
user@host:/path in terminal title

Based on <https://wiki.archlinux.org/index.php/Color_Bash_Prompt>.
Get certificate fingerprint
Sorted file
Print XTerm contents to file

Press Alt-P to get a text file with ANSI control characters in /tmp/xterm-screenshot.bin.XXXXXXXXXX.
Save XTerm screenshots as HTML
POSIX 2008-compliant alternative to `find`'s `-print0`

From <http://www.dwheeler.com/essays/filenames-in-shell.html#summary>.
Secure against filenames starting with a dash
Already have other ways to show NUL
`printf` is more portable for escaped strings

Based on <http://www.in-ulm.de/~mascheck/various/echo+printf/>.
`notify-send` use

Send a notification to the desktop.
Cut a video with `avconv`
Get only the HTTP response headers of a web address
Get only the revision number of a Subversion repository
Find undefined symbols in shared objects
Get MX records for a domain
`nm` manual
Correct sequence of parameters
Test mutt-ldap.pl

Install dependencies as well.
Handle unknown chroot path in older kernels