I want to search some empty alternation with ls but nothing is working.I have a list of files: foo.txt foouubar.txt fooubbar.txt fooubar_1.txt foounix.txtI want to have only foo.txt and foouubar.txt I tried:ls foo\(*ubar\|\(\)\).txt but the result is empty. Is there a mistake in my command line?I am in tcsh
How to search empty alternation with tcsh
shell;tcsh