Redirection (computing) - Redirecting Standard Input and Standard Output

Redirecting Standard Input and Standard Output

Redirection is usually implemented by placing certain characters between commands. Typically, the syntax of these characters is as follows:

command1 > file1

executes command1, placing the output in file1. This will clobber any existing data in file1.

To append output to the end of the file, use the >> operator:

command1 >> file1

Using

command1 < file1

executes command1, with file1 as the source of input (as opposed to the keyboard).

command1 < infile > outfile

combines the two capabilities: command1 reads from infile and writes to outfile

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