Greps regular expressions in a text file(s) and prints out the paragraphs containing those expressions; a paragraph is defined as a block of text delimited by an empty or blank line; fully customizable via command line parameters.

(The silver searcher) is a text search utility targeted to source code; it skips versioning systems data directories; it is inspired by ack, but faster.

A tool like grep optimized for programmers; written in Perl, it speeds up searches thanks to skipping non interesting directories, such as .git.

Executes SQL-like queries on CSVs/TSVs tabular data files; each tabular file is treated as a database table; support to all SQL constructs (WHERE, GROUP BY, JOIN).

Utility that allows users to choose one option from a set of choices using an interface with fuzzy search functionality.

A Python script that

1) receives input lines from stdin or a file,
2) lists the input lines and waits for input that filter/select the line(s),
3) outputs the selected line(s) to stdout;

Can be used to add interactivity to many regular shell commands.

(JSON Query?) is sed-like processor for JSON data; can be used to process JSON files and data streams and perform operations such as those allowed by cat, sed, grep and awk on regular text files.

(Generic Colouriser) can be configured to parse a given text stream and to colorize it according to regexp written in configuration files; different patterns can be associated to file types.

A cat command with colorized output.

A command to open multiple log files in a single terminal window and monitor them in real-time.