Redirections

• Redirect stdout to a file: > FILE
• Append stdout to a file: >> FILE
• Redirect stderr to a file: 2> FILE
• Redirect stdout and stderr to the same file by redirecting stream 2 to stream 1: > FILE 2>&1
  • Bash version of the above (non standard, avoid): &> FILE or &>> FILE for appending
• Redirect stdout and stderr to different files: > FILE 2> ERRORFILE
• Read stdin from a file: < FILE
• Read stdin from a file and write stdout to a file: wc < input.txt > output.txt
  • CARE REQUIRED: command < FILE > FILE might result in FILE getting clobbered due to the order of redirections

For more, see IO Redirections.