bash-tutorials/redirect.sh at master · becloudready/bash-tutorials · GitHub

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#!/bin/bash

##Note that the file descriptor 0 is normally standard input (STDIN), 1 is standard output (STDOUT), and 2 is standard error output (STDERR).
echo Just '>' ---------------------------------------
find /etc -name grub >grub.out
echo Doing '2>' ---------------------------------------
find /etc -name grub 2>errs.out
echo Doing '&>' ---------------------------------------
find /etc -name grub &>both.out

pgm > file

Output of pgm is redirected to file

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pgm < file

Program pgm reads its input from file

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pgm >> file

Output of pgm is appended to file

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n > file

Output from stream with descriptor n redirected to file

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n >> file

Output from stream with descriptor n appended to file

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n >& m

Merges output from stream n with stream m

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n <& m

Merges input from stream n with stream m

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<< tag

Standard input comes from here through next tag at the start of line

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|

Takes output from one program, or process, and sends it to another