how to make own shell command with arguments in emacs?

Question

I want to make my own shell command where i have a variable filename in the command. The filename is passed in an interactive function. I don't know how to save the filename passed as an argument to a variable and further use it to append the whole command.

legoscia · Accepted Answer · 2018-04-05 14:07:24Z

1

To ask for a file name (or any other type of value), use interactive. (interactive "fFile: ") means to ask for an existing file (that's what f stands for), prompting with File:.

Then, to concatenate a number of strings, use the concat function.

So the function would look something like this:

(defun my-cat-file (filename)
  (interactive "fFile: ")
  (shell-command (concat "cat " filename)))

answered Apr 5, 2018 at 14:07

legoscia

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Ishu Gupta Over a year ago

Thanks a lot. It really helped me. Can you just suggest any command that automatically takes the present file when i press enter (just like % in .vimrc file. basically i want that interactive command should not invoke automatically when i dont pass any argument as filename while calling the function and automatically takes the present file.

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