Answer by Kamil Maciorowski for bash alias or bash function that adds a timestamp to the beginning of a filename when creating a file with nano?

A function like this:

# unalias nanotime first, if needednanotime() {    nano "$(date +%Y-%m-%d_%H.%M.%S)-$1"}

will do what you want, although it's limited.

• It simply glues the date string to the beginning of the first argument, so paths with / will not behave well.
• It uses just one argument. With $@ we could pass many arguments to nano, but in general the name you want to glue the date to may be any of them.

To overcome these a non-trivial logic is needed. I'm not going to create any logic because personally I would prefer the following:

bind -x '"\C-x\C-t": _nanotime'_nanotime() {    local dte    dte="$(date +%Y-%m-%d_%H.%M.%S-)"    READLINE_LINE="${READLINE_LINE:0:$READLINE_POINT}$dte${READLINE_LINE:$READLINE_POINT:${#READLINE_LINE}}"    READLINE_POINT="$((READLINE_POINT+${#dte}))";}

From now on Ctrl+x, Ctrl+t injects the current date and time when you type a command. E.g. type
nano Ctrl+x, Ctrl+tThis_is_the_description_of_my_file.txtEnter

The advantage is the method is not limited to nano. Insert the date in any command line you wish, at any cursor position you wish.

Tested in Bash 5.2.21.