Free line utility software for linux

Sethi Search Utility provides a simple command line utility to submit a search to Google, Yahoo!, or MSN.
Sethi Search Utility is a simple command line utility to submit a search to Google, Yahoo!, or MSN and show the (text) results on standard output. Support for several search engines is included.
Its currently in serious need of a re-write, especially to avoid scraping and become a good engine using the search APIs provided.
Enhancements:
- The Google configuration was updated.

Iris is a video conversion utility in C++ that works as a front-end to mencoder. Iris Video Conversion Utility can run in command-line or graphical modes and currently supports conversion to DVD MPEG, DivX AVI and VCD MPEG
This software intends to ease video conversion to common formats.
Help Wanted / TODO
- Cancel button does not always work
- More output formats
- Reset values for command-line format paramater
- re-work stderr redirection
- catch and identify mencoder conditions

Duplicity backs directories by producing encrypted tar-format volumes and uploading them to a remote or local file server.
Because duplicity uses librsync, the incremental archives are space efficient and only record the parts of files that have changed since the last backup. Because duplicity uses GnuPG to encrypt and/or sign these archives, they will be safe from spying and/or modification by the server.
The duplicity package also includes the rdiffdir utility. Rdiffdir is an extension of librsyncs rdiff to directories---it can be used to produce signatures and deltas of directories as well as regular files. These signatures and deltas are in GNU tar format.
Main features:
Easy to use: Although duplicity is a command-line utility, the semantics are relative simply. To take a basic example, this command:
- duplicity /usr scp://host.net/target_dir
- backs up the /usr directory to the remost host host.net via scp.
Encrypted and signed archives: The archives that duplicity produces can be encrypted and signed using GnuPG, the standard for free software cryptology. The remote location will not be able to infer much about the backups other than their size and when they are uploaded. Also, if the archives are modified on the remote side, this will be detected when restoring.
Bandwidth and space efficient: Duplicity uses the rsync algorithm so only the changed parts of files are sent to the archive when doing an incremental backup. For instance, if a long log file increases by just a few lines of text, a small diff will be sent to and saved in the archive. Other backup programs may save a complete copy of the file.
Standard file format: Athough archive data will be encrypted, inside it is in standard GNU-tar format archives. A full backup contains normal tarballs, and incremental backups are tar archives of new files and the deltas from previous backups. The deltas are in the format produced by librsyncs command-line utility rdiff.
- Although you should never have to look at a duplicity archive manually, if the need should arise they can be produced and processed using GnuPG, rdiff, and tar.
Choice of remote protocol: Duplicity does not make many demands on its archive server. As long as files can be saved to, read from, listed, and deleted from a location, that location can be used as a duplicity backend. Besides increasing choice for the user, it can make a server more secure, as clients only require minimal access.
- Currently local file storage, scp/ssh, ftp, rsync, and Amazon S3 are supported, and others shouldnt be difficult to add.

CLSimilarImages is a command-line utility for finding visually similar images which may not be identical. It reads filenames from standard input, and outputs customisable results to standard output.

It can write similarity data to files for rapid future comparisons, with timestamps for quick updates. The project can compare one collection of images with itself, or two collections with each other. It works well in scripts or with pipes.

Mp3Splt is a command line utility to split mp3 and ogg files selecting a begin and an end time position, without decoding. Mp3splt project is very useful to split large mp3/ogg to make smaller files or to split entire albums to obtain original tracks.
If you want to split an album, you can select split points and filenames manually or you can get them automatically from CDDB (internet or a local file) or from .cue files.
Supports also automatic silence split, that can be used also to adjust cddb/cue splitpoints. You can extract tracks from Mp3Wrap or AlbumWrap files in few seconds.
Libmp3splt is an attempt to create a library from mp3splt.
Mp3splt-gtk is a GTK2 gui that uses libmp3splt.
Enhancements:
- code completely reviewed and reorganised
- fixed bugs with the tags
- fixed some other bugs