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*? It will either result in shell wildcard expansion (if there are filenames matching the wildcard pattern), or grep will take it as 0-or-more repetition operator for the character preceding*.grep -nr MobileAppSer* .1. Assume we have 3 files in the current directory matchingMobileAppSer*wildcard pattern: namedMobileAppServlet.java,MobileAppServlet.class,MobileAppServlet.txt. Thengrepwill be invoked like this:grep -nr MobileAppServlet.class MobileAppServlet.java MobileAppServlet.txt .. It means search for text "MobileAppServlet.class" in files MobileAppServlet.java, MobileAppServlet.txt, and elsewhere in the current directory - which surely isn't what the user wants here.MobileAppSer*wildcard pattern,grepwill receive the argumentMobileAppSer*as-is and thus will take it as search for text "MobileAppSe" followed by 0 or more occurrences of "r", so it will attempt to find texts "MobileAppSe", "MobileAppSer", "MobileAppSerr", "MobileAppSerrr", etc. in current directory's files contents - not what the user wants either.grep -nr 'yourString*' .and got some files with "binary file matches". You can add--textor-ato prevent this:grep -anr 'yourString*' .