Redirecting Input/Output

The Korn shell provides a number of operators that can be used to manipulate command input/output, files, and co-processes.

<file	redirect standard input from file
>file	redirect standard output to file. Create file if non-existent, else overwrite.
>>file	append standard output to file. Create file if non-existent.
>\|file	redirect standard output to file. Create file if non-existent, else overwrite even if noclobber is set.
<>file	open file for reading & writing as standard input
<&–	close standard input
>&–	close standard output
<&n	redirect standard input from file descriptor n
>&n	redirect standard output to file descriptor n
n<file	redirect file descriptor n from file
n>file	redirect file descriptor n to file
n>>file	redirect file descriptor n to file. Create file if non-existent, else overwrite.
n>\|file	redirect file descriptor n to file. Create file if non-existent, else overwrite even if noclobber is set.
n<&m	redirect file descriptor n from file descriptor m
n>&m	redirect file descriptor n to file descriptor m
n<>file	open file for reading & writing as file descriptor n
n<<word	redirect to file descriptor n until word is read
n<<–word	redirect to file descriptor n until word is read; ignore leading tabs
n<&–	close file descriptor n for standard input
n>&–	close file descriptor n for standard output
n<&p	redirect input from co-process to file descriptor n. If n is not specified, use standard input.
n>&p	redirect output of co-process to file descriptor n. If n is not specified, use standard output.

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