Bash Basics: Redirecting STDOUT and STDERR

std.sh

#!/bin/bash

# Shows how STDOUT and STDERR can be redirected to /dev/null, which makes it go away, but could be redirected anywhere
# 
# OUTPUT
# 
# 1 - STDOUT redir, but not STDERR
# ./return_var.sh: line 13: thisisbad: command not found
# 2 - STDOUT redir, but not STDERR
# 3 - STDERR redir, but not STDOUT
# 4 - STDERR redir, but not STDOUT
# fred is silly
# 5 - redir both
# 6 - redir both
# 7 - redir STDERR to STDOUT
# 8 - redir STDERR to STDOUT
# 

echo 1 - STDOUT redir, but not STDERR
thisisbad > /dev/null #produces STDERR

echo 2 - STDOUT redir, but not STDERR
echo "fred is silly" > /dev/null #produces STDOUT

echo 3 - STDERR redir, but not STDOUT
thisisbad 2> /dev/null #produces STDERR

echo 4 - STDERR redir, but not STDOUT
echo "fred is silly" 2> /dev/null #produces STDOUT

echo 5 - redir both
thisisbad &> /dev/null #produces STDERR

echo 6 - redir both
echo "fred is silly" &> /dev/null #produces STDOUT

echo 7 - redir both (alternate way)
thisisbad > /dev/null 2>&1 #STDERR

echo 8 - redir both (alternate way)
echo "fred is silly" > /dev/null 2>&1 #produces STDOUT