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--- tutorials:perl_quick_reference [2010/08/12 12:07] – susanbruce
+++ tutorials:perl_quick_reference [2018/12/19 10:59] (current) – chkuo
@@ Line 2: / Line 2: @@
   * ($): variable is a name for a container that holds one or more values; use $ to get the value.
   * (!): negation operator
-  * (tr///): transliterating one group of characters into another.
+  * (tr): transliterating one group of characters into another.
-  * (s///): substitution
+  * (s): substitution
   * (%): modulus operator:
-  * /s : match any character with
-  * ! : negation operator and see P35
   * \s : shortcut for whitespace
   * \s+ : match for one or more whitespace characters
-  * \S+ : match any character that their counterpart would not match
+  * /g : modifier-global
-  * /g : global replacements
+  * /d : modifier-delete found but unreplaced characters
-  * -p option : tells perl to write a program for you/file is a named pipe
-  * -e option : executable code follow / file or directory name exist
-  * /d : modifier delete found but unreplaced characters
-  * (=~): right against string on the left
   * == : equal
   * = : assignment operator
   * . : string values can be concatenated with the . operator
   * ( * ): match the preceding item 0 or more times
-  * head : output the first part of the file
+  * ( ^ ): the caret match the beginning of a line
+  * $ : match the end of a line
+===== installation =====
+  * summary of configuration
+    * ''perl -V''
+    * including the content of ''@INC''
+  * locate specific modules
+    * ''perldoc -l Module::Name''; for example, ''perldoc -l Bio::SearchIO''