Usage: ack [OPTION]... PATTERN [FILES] The following is the list of filetypes supported by ack. You can specify a file type with the --type=TYPE format, or the --TYPE format. For example, both --type=perl and --perl work. Note that some extensions may appear in multiple types. For example, .pod files are both Perl and Parrot. --[no]actionscript .as .mxml --[no]asm .asm .s --[no]batch .bat .cmd --[no]binary Binary files, as defined by Perl's -B op (default: off) --[no]cc .c .h .xs --[no]cfmx .cfc .cfm .cfml --[no]cpp .cpp .cc .cxx .m .hpp .hh .h .hxx --[no]csharp .cs --[no]css .css --[no]elisp .el --[no]erlang .erl --[no]fortran .f .f77 .f90 .f95 .f03 .for .ftn .fpp --[no]haskell .hs .lhs --[no]hh .h --[no]html .htm .html .shtml .xhtml --[no]java .java .properties --[no]js .js --[no]jsp .jsp .jspx .jhtm .jhtml --[no]lisp .lisp .lsp --[no]lua .lua --[no]make Makefiles --[no]mason .mas .mhtml .mpl .mtxt --[no]objc .m .h --[no]objcpp .mm .h --[no]ocaml .ml .mli --[no]parrot .pir .pasm .pmc .ops .pod .pg .tg --[no]perl .pl .pm .pod .t --[no]php .php .phpt .php3 .php4 .php5 --[no]plone .pt .cpt .metadata .cpy .py --[no]python .py --[no]ruby .rb .rhtml .rjs .rxml .erb --[no]scheme .scm --[no]shell .sh .bash .csh .tcsh .ksh .zsh --[no]skipped Files, but not directories, normally skipped by ack (default: off) --[no]smalltalk .st --[no]sql .sql .ctl --[no]tcl .tcl .itcl .itk --[no]tex .tex .cls .sty --[no]text Text files, as defined by Perl's -T op (default: off) --[no]tt .tt .tt2 .ttml --[no]vb .bas .cls .frm .ctl .vb .resx --[no]vim .vim --[no]xml .xml .dtd .xslt .ent --[no]yaml .yaml .yml