LANGUAGE » SHELL_SCRIPT » FISH

Redirection

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Reference:fishshell.com

File descriptors ​

NumberFile Descriptor
0stdin
1stdout
2stderr

Send to strerr ​

Redirect stdout to stderr:

fish
echo 'Something unexpected!' >&2

Redirect to file ​

Redirect stdout or stderr to file (use >> to append output):

fish
cmd < input_file
cmd > output_file  # stdout only
cmd 2> output_file # stderr only

Redirect everything to file:

fish
cmd &> output_file     # stdout and stderr
cmd > output_file 2>&1 # stdout and stderr

Combine outputs ​

If going to pipe or redirect output of several commands, use begin and end to combine commands.

fish
# List git tracked and untracked files
begin
    git ls-files
    git status --short | grep '^??' | cut -d' ' -f2-
end | less