20-Unix Input/Output and Regular Expressions

This set of flashcards covers key terms and concepts related to Unix Input/Output operations and the use of regular expressions in searching files.

STDIN

Standard Input; where programs expect to find their input.

STDOUT

Standard Output; where programs write any generated output.

STDERR

Standard Error; where programs write error messages.

Redirection

The process of sending input and output to and from files instead of standard input/output devices.

Piping

A method to connect the output of one command to the input of another command.

grep

A command used to search for patterns in files and print lines that contain those patterns.

Regular Expressions (regex)

A powerful notation for matching strings in files using patterns.

Metacharacters

Special characters used in regular expressions that have specific meanings.

Fixed Patterns

Simple string searches that do not utilize the flexibility of regular expressions.

Escape Character

The character used to indicate that the following character should be treated literally.