Bashinator is a bash shell script framework. It provides flexible and powerful message handling that lets you print to stdout, log (to syslog or a logfile), and mail messages with a single message function. Exhaustive information is included in messages to ease debugging. This information includes timestamps, message severity, source file, line numbers, and function names. A facility for tracing the function call stack is provided. Sub-command output can be logged by capturing the stdout/stderr of external commands to a dedicated temporary logfile. The framework also provides lockfile handling.
The Teleport command is a replacement for the traditional cd command. More accurately, it's a wrapper around the cd command, with various improvements. It keeps a history of the directories you have visited. You can easily jump to any directory in your history. You can display your history. You can easily create aliases for directories to make it even easier to jump to them.
Autojump is a tool that acts as a complement to cd: it makes navigating your filesystem a lot faster. It works by automagically maintaining a database of the directories you use the most from the command line, and allows you to jump back and forth between them, by typing just a few letters of the name of the directory you want to jump to. It works for Linux, Mac, and Cygwin under Windows.