site/docs/3.6/cmds/fish_clipboard_paste.html
fish\_clipboard\_pastefish\_clipboard\_paste | foo
The fish_clipboard_paste function copies text from the system clipboard.
If its stdout is not a terminal (see isatty), it will output everything there, as-is, without any additional newlines. If it is, it will put the text in the commandline instead.
If it outputs to the commandline, it will automatically escape the output if the cursor is currently inside single-quotes so it is suitable for single-quotes (meaning it escapes ' and \\).
It is bound to Control+V by default.
fish_clipboard_paste works by calling a system-specific backend. If it doesn’t appear to work you may need to install yours.
Currently supported are:
pbpaste
wl-paste using wayland
xsel and xclip for X11
powershell.exe on Windows (this backend has encoding limitations and uses windows line endings that fish_clipboard_paste undoes)