Gfilui

I want to use the filename currently used by *. How to get the name of the file?

If you want to use the star char * usually used as a wildcard in bash to select multiple files, you need to quote the filename or escape the * with a backslash . Example:

$ touch '*.jpg'
$ touch 'mypicture.jpg'
$ ls
'*.jpg' mypicture.jpg
$ rm '*.jpg'
$ ls
mypicture.jpg

You can also use the same script with *.jpg instead of '*.jpg'.

*.jpg will expand to every .jpg file in the current directory. If you execute rm *.jpg, all of those files will be deleted. The shell expansion of the wildcard * does not store the results as separate variables, or give you a way to reference individual results within the expansion set.

If you wish to operate on each file matched by the wildcard expression, you may wish to use a for loop. Using a loop can assign the filename to a variable that you choose on each run of the loop. For example:

for file in *.jpg; do
 echo "$file"
done

Will echo each of the files matched by *.jpg. You can of course use much more complex commands inside the loop, including other conditional statements such as if statements.

To show all the files indicated by *.jpg type:

ls *.jpg

The command rm *.jpg will remove all of these files.