How to redirect and pipe in Fish

The commands below are for the Fish shell, but most of them work with Bash too.

Redirection

• To redirect to stdin is similar to Bash:

$ ./a.out > out.txt

• To redirect stdout is similar to Bash:

$ ./a.out < in.txt

• To redirect stderr:

$ ./a.out ^ out.txt

• To redirect both stdout and stderr:

$ ./a.out > out.txt 2>&1

Note how the binding of stderr (2) to stdout (1) is placed after the filename.

Piping

• To pipe stdout is similar to Bash:

$ ./a.out | less

• To pipe stderr:

$ ./a.out ^| less

• To pipe both stdout and stderr:

$ ./a.out 2>&1 | less

Reference: Redirections section of the Bash manual.

Tried with: Fish 2.7.1 and Ubuntu 16.04