cheat sheets.

Cheat Sheet Title: [ no_spaces_alphanumeric_only ]

Cheat Sheet:
Overview ======== grep searches for lines matching a pattern. $ grep [OPTION]... PATTERN [FILE] ... PATTERN can be a normal string or a regular expression. For more on regular expressions see: $ cheat regexp Get full help: $ grep --help Basic Usage =========== $ grep index *.rb admin_controller.rb: def index store_controller.rb: def index store_controller.rb: redirect_to_index 'Invalid product' store_controller.rb: redirect_to_index "Your cart is currently empty." Useful Options ============== -h: suppress file names in output -w: restrict search to whole words only -c: displays count of matching lines in each file, not the lines themselves (note this is not the same as $ grep index *.rb | wc -l) -i: ignore case -l: list only file names containing matching lines -n: precede each line with the line number where it was found -v: display all lines NOT matching pattern -C: Display NUM lines of context either side of matches -e pattern: Search for a pattern. Can use multiple times on a line -r: Search recursively from the current or specificed directory --include=pattern: Only search in file names matching pattern --exclude=pattern: Do not search in file names matching pattern Examples ======== Recursive search, multiple patterns: $ grep -r --include=*.rb -e "TagsHelper" -e "tags_helper" . ./app/models/foo.rb: include TagsHelper ./app/models/bar.rb: include TagsHelper ./vendor/plugins/acts_as_taggable_on_steroids/lib/tags_helper.rb:module TagsHelper ./vendor/plugins/acts_as_taggable_on_steroids/test/abstract_unit.rb:require_dependency File.dirname(__FILE__) + '/../lib/tags_helper' ./vendor/plugins/acts_as_taggable_on_steroids/test/tags_helper_test.rb:class TagsHelperTest < Test::Unit::TestCase ./vendor/plugins/acts_as_taggable_on_steroids/test/tags_helper_test.rb: include TagsHelper # Count the number of functions in all JS files grep -c function *.js # Print lines that DO NOT have "function" grep -v function *.js # List processes that match "pidgin" (non-Windows) ps -ef | grep pidgin # Print a list of: function <function-name> and sort it grep -Eho "^\s*function \w+" *.js | sort # Print filenames, line #s, and lines that start with "(white space)function" grep -EHn "^\s*(function \w+|\w+ \= function)" *.js # Print only duplicate function names grep -hEo "^\s*function \w+" *.js | sort | uniq -d

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