GNU parallel is a shell tool for executing jobs in parallel locally or using remote computers. A job is typically a single command or a small script that has to be run for each of the lines in the input. The typical input is a list of files, a list of hosts, a list of users, a list of URLs, or a list of tables. If you use xargs today you will find GNU parallel very easy to use, as GNU parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU parallel may be able to replace most of the loops and make them run faster by running several jobs in parallel. GNU parallel makes sure output from the commands is the same output as you would get had you run the commands sequentially. This makes it possible to use output from GNU parallel as input for other programs.
rocknroll (Rsync fOr baCKup and Roll) is an incremental backup maker based on rsync. It backs up a remote directory tree to a destination directory on the local host. For this backup, it manages a set of archives named tag.1, tag.2, etc. Using the famous "link-dest" option of rsync, it keeps only the difference between the different archives.
Yasma (Yet Another Sendmail Logfile Analyzer) is a reporting tool for sendmail log files. It provides a nice overview of your mail traffic like: messages transferred, some average values, top lists of messages sent, received, rejected, etc., and top lists of supposed spammers, status messages, relay hosts, and mailers. It analyzes one or more log files from the command line and writes an HTML report. For security, it can hide the user part of mail addresses listed in the report. A GeoIP database can be used to show country information.
Twapake is a system administration utility for Slackware and Slackware-based operating systems only, making it easier to manage last installed packages and see the installation date of a package. It can print a simple list of N packages sorted by installed date to STDOUT. It can print a snapshot logfile to the /var/log/twapake/ directory. A snapshot is a list of all packages sorted by installed date at T time. The installed date is printed too, making it easier to see when a package has been installed on your system. You can remove the last N installed packages, print the packages installed since a chosen date, and launch a Curses User Interface for easy removal.
CCFE is a simple tool to quickly supply an interactive screen-oriented interface to command line scripts and commands. It prompts users for the information needed to run the commands, and can be programmed with your preferred shell to provide predefined selections and run-time defaults. It also provides a menu system to hierarchically organize them and a viewer to browse the standard output and standard error of invoked scripts or commands.