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The other arguments to tar are either options , which change the way tar performs an operation , or file names or archive members , which specify the files or members tar is to act on . This way , using these citations to make up file names or URLs ( Uniform Resource Locators ) in the context of the Internet wo n't pose any problem with current computer systems . The specified String can be a file name or a file path . This special significance of ` $ ' is why you must write ` $ $ ' to have the effect of a single dollar sign in a file name or command . Time required for reading and marking file material can be greatly reduced if the case file name or number appears on the papers . Both mod_mime and mod_mime_magic use this phase to compare the file name or contents against the administrator 's configuration and set the content type , language , character set and request handler . The remaining arguments are interpreted either as file names or as member names , depending on the basic operation tar is performing . When you specify the ` - - exclude = pattern ' option , tar ignores files which match the pattern , which can be a single file name or a more complex expression .