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Redirecting STDERR

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2 is STDERR. 

$ echo_to_stderr 2>/dev/null # echos nothing

Definitions:

echo_to_stderr is a command that writes "stderr" to STDERR 

echo_to_stderr () {
    echo stderr >&2
}

$ echo_to_stderr
stderr
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Redirection:
* Redirection
* Redirecting standard output
* Append vs Truncate
* Redirecting both STDOUT and STDERR
* Using named pipes
* Redirection to network addresses
* Redirecting multiple commands to the same file
* Print error messages to stderr
* STDIN STDOUT and STDERR explained
* Redirecting STDIN
* Redirecting STDERR
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