General Information
Using input/output redirection (>, », |, 2>, etc.).
'>' Redirect standard output to a file, overwrite contents
cat /etc/system-release > info.txt
'»' Redirect standard output to file, append to file
tail /etc/passwd >> info.txt
'|' Piping output to other commands
cat /etc/passwd | wc -l
'2>' Redirect standard error
ssh admin@webserver01.com "uptime" 2>/dev/null
Redirect both standard error and standard output
ssh admin@webserver01.com "uptime" &> results.log
Redirect standard error to standard out
cat /etc/system-release /etc/Red 2>&1 | grep Red