I made this one to find binaries in NixOs and other systems

get_bin_path() {
        paths=${2:-$PATH}
        for dr in $(echo $paths | tr ':' '\n') ; do
                if [ -f "$dr/$1" ] ; then
                        echo "$dr/$1"
                        return 0
                fi
        done
        return 1
}

Then I made this one to, if I have a shell o opened inside neovim it will tell the neovim process running the shell to open a file on it, instead of starting a new process

_nvim_con() {
        abs_path=$(readlink --canonicalize "$@" | sed s'| |\\ |'g)
        $(get_bin_path nvim) --server $NVIM --remote-send "<ESC>:edit $abs_path<CR>"
        exit
}

# start host and open file
_nvim_srv() {
        $(get_bin_path nvim) --listen $HOME/.cache/nvim/$$-server.pipe $@
}

if [ -n "$NVIM" ] ; then
        export EDITOR="_nvim_con"
else
        export EDITOR="_nvim_srv"
fi

Lastly this bit: which if it detects a file and a line number split by a : it will open the file and jump to the line

_open() {
        path_parts=$(readlink --canonicalize "$@" | sed s'| |\\ |'g | sed 's/:/\t/' )
        file=$(echo "$path_parts" | awk ' { print $1 }' )
        line=$(echo "$path_parts" | awk ' { print $2 }' )

        if [ -n "$line" ] ; then
                # has line number
                if [ -n "$NVIM" ] ; then
                        $(get_bin_path nvim) --server $NVIM --remote-send "<ESC>:edit $file<CR>:+$line<CR>"
                        exit
                else
                        $(get_bin_path nvim) --listen $HOME/.cache/nvim/$$-server.pipe $file "+:$line"
                fi
        else
                $EDITOR $file
        fi
}

alias nvim="_open"

all of my bash config is here