Linux Redirection & Pipes

###Linux Redirection & Pipes###

Features:

1. Ability to control input and output

Input redirection '<':

1. cat < 123.txt

Note: Use input redirection when program does NOT default to file as input

Output redirection '>':

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