Many of the Unix utility programs can accept several filenames at once on the command line. In general, if it's meaningful for a program to do so, it will have this ability. For example

$ rm afile.txt
$ rm afile.txt bfile.txt cfile.txt

Since the shell expands a wildcard sequence into a list of file names, this works nicely.

$ rm afile.txt *.bak

If you find yourself doing things like

$ rm afile.txt
$ rm bfile.txt
$ rm cfile.txt

you aren't using Unix effectively.