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Showing posts from January, 2009

Linux Redirection & Pipes

Features: 1. Ability to control input and output Input redirection '<': 1. cat ': 1. cat 123.txt > onetwothree.txt Note: Default nature is to: 1. Clobber the target file 2. Populate with information from input stream Append redirection '>>': 1. cat 123.txt >> numbers.txt - creates 'numbers.txt' if it doesn't exist, or appends if it does 2. cat 456.txt >> numbers.txt Pipes '|': Features: Connects the output stream of one command to the input stream of a subsequent command 1. cat 123.txt | sort 2. cat 456.txt 123.txt | sort 3. cat 456.txt 123.txt | sort | grep 3