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Regular expressions
Regular expressions

Dept. of CSE, BUAA
Dept. of CSE, BUAA

... Everything that can be a device-independent filter should be. Data streams should, if at all possible, be textual (so they can be viewed and filtered with standard tools). Database layouts should if at all possible be textual (humaneditable). Application protocols should if at all possible be te ...
C Programming conditional Statements
C Programming conditional Statements

... Output Enter name: Dennis Ritchie Your name is Dennis. Here, program will ignore Ritchie because, scanf() function takes only string before the white space. ...
PPT - Bioinformatics.ca
PPT - Bioinformatics.ca

... running the perl program and feeding it the code line by line. For perl to run, it must be on your path. Or, (better) you must specify its location in your first line of script. Use which to find where a program is located. ...
Welcome to CS 100
Welcome to CS 100

... Statements are not numbered Layout is essential for readability, but irrelevant for meaning, e.g., this code segment has the same effect: num=in.readInt();rem=num%2;if(rem==0) System.out.println("even");else ...
Lec-1-perl
Lec-1-perl

... print “String is not foo\n” unless ($string eq “foo); Unless cannot have else or else if components. ...
AdvancedUNIXDec16
AdvancedUNIXDec16

... The awk command is a programming language in its own right. It is a useful tool for data manipulation. The general form is: awk ‘/pattern/{action}’ file Awk assumes that the data file is in columns and that these are separated by a delimiter, the default is a space. The pattern and action don’t have ...
ECS10 - UC Davis Computer Science
ECS10 - UC Davis Computer Science

... anything with it that might cause a crash. P h doesn’t Python d ’ have h a function f to checks h k whether a string can be converted to a float or to an int There is a way to do this, but we haven’t learned the right parts of Python yet…. ...
14 - Villanova Computer Science
14 - Villanova Computer Science

... Scripting language More powerful than AWK More flexible than shell scripts Syntax derived from C Large language Later versions contain classes Many irregularities in design Many alternatives for syntax ...
14 - Villanova Computer Science
14 - Villanova Computer Science

... 1. Given a file of words, one per line, write an AWK script that returns the frequency count of the letters in the words. Use a template that – has one action statement in body, a for loop – has one statement for the END pattern, a for loop that controls the printing – uses one user-defined variable ...
1

AWK

AWK is an interpreted programming language designed for text processing and typically used as a data extraction and reporting tool. It is a standard feature of most Unix-like operating systems.The AWK language is a data-driven scripting language consisting of a set of actions to be taken against streams of textual data – either run directly on files or used as part of a pipeline – for purposes of extracting or transforming text, such as producing formatted reports. The language extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and regular expressions. While AWK has a limited intended application domain and was especially designed to support one-liner programs, the language is Turing-complete, and even the early Bell Labs users of AWK often wrote well-structured large AWK programs.AWK was created at Bell Labs in the 1970s, and its name is derived from the family names of its authors – Alfred Aho, Peter Weinberger, and Brian Kernighan. The acronym is pronounced the same as the name of the bird auk (which acts as an emblem of the language such as on The AWK Programming Language book cover – the book is often referred to by the abbreviation TAPL). When written in all lowercase letters, as awk, it refers to the Unix or Plan 9 program that runs scripts written in the AWK programming language.
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