Several of the programs we have been using as examples,
such as "grep" and "wc", have the property that when
you use file names with them, the output includes
the file names. For example, if you say
grep pattern file1 file2 file3
each line that contains "pattern" is printed out
with "file1:" or whatever in front of it.
Sometimes you would love to get rid of that file name, since
you don't care a bit where the line came from,
and the file name clutters up the output.
One thing is to use "cat" to collect the files, and
pipe into "grep"; in that case "grep" doesn't mention
any file name because there isn't one.
In this directory there are several files whose names end
in ".x". Use a pipeline of "cat" and "grep" to print all the lines
that contain the letters "ion", without any identifying filenames.
Type "ready" when you're done.
ion, but this one is in the wrong file!