Redirects in Linux

…In Bash and other Linux shells, every running program uses three standard I/O streams. Each stream is represented by a numeric file descriptor:

• 0 — stdin, the standard input stream.
• 1 — stdout, the standard output stream.
• 2 — stderr, the standard error stream.

Streams can be redirected using the n> operator, where n is the file descriptor number. When n is omitted, it defaults to 1 (standard output).

# Standard
command 1> file.txt

# Std err
command 2> error.txt


## To redirect to diff files
command 1> output.txt 2> error.txt

## Both
command 1 &> output.txt

Reference

How to Redirect stderr to stdout in Bash | Linuxize