Category:AWK
This programming language may be used to instruct a computer to perform a task.
Execution method: | Interpreted |
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See Also: |
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AWK is a small but powerful programming language that can process and convert text files. AWK is part of every Unix-derived system.
Each AWK program consists of pattern-action statements.
The program reads each input line, checks lines against patterns, and runs matching actions.
For programs that never read input lines, the entire program can be one BEGIN { ... }
block.
- List users who have /bin/ksh as a shell.<lang awk>$ awk -F: '$7 == "/bin/ksh" { print $1 }' /etc/passwd</lang>
AWK has only three types of variables: they are strings, floating-point numbers, and associative arrays (where every array index is a string). Conversion between strings and numbers is automatic. AWK also has regular expressions, which appear in many AWK programs. There are a few built-in functions, like cos() and sprintf().
- Find average line length.<lang awk>$ awk '{ cnt += length($0) } END { print cnt / NR }' /etc/rc</lang>
The name "AWK" comes from the initials of Alfred Aho, Peter Weinberger and Brian Kernighan: they invented AWK during the 1970s. A few decades later, Kernighan continues to maintain the reference implementation of AWK.
Links
- awk(1) manual page, short and brief
- gawk GNU awk manual
- AWK in Wikipedia
- AWK Community Portal
Online-Execution
- ideone.com - gawk, mawk (both are kept up to date)
Todo
Subcategories
This category has the following 4 subcategories, out of 4 total.
@
- AWK Implementations (8 P)
- AWK User (69 P)
- Awk User (2 P)
Pages in category "AWK"
The following 200 pages are in this category, out of 710 total.
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A
- A+B
- Abbreviations, automatic
- Abbreviations, easy
- ABC problem
- ABC words
- Abundant odd numbers
- Abundant, deficient and perfect number classifications
- Ackermann function
- Additive primes
- Air mass
- Align columns
- Aliquot sequence classifications
- Almost prime
- Alternade words
- Amicable pairs
- Anadromes
- Anagrams
- Anagrams/Deranged anagrams
- Angle difference between two bearings
- Angles (geometric), normalization and conversion
- Anti-primes
- Append a record to the end of a text file
- Append numbers at same position in strings
- Apply a callback to an array
- Approximate equality
- Archimedean spiral
- Arithmetic-geometric mean
- Arithmetic/Complex
- Arithmetic/Integer
- Array concatenation
- Array length
- Arrays
- Ascending primes
- Assertions
- Associative array/Creation
- Associative array/Iteration
- Associative array/Merging
- Attractive numbers
- Audio alarm
- Averages/Arithmetic mean
- Averages/Mean angle
- Averages/Mean time of day
- Averages/Median
- Averages/Mode
- Averages/Pythagorean means
- Averages/Root mean square
- Averages/Simple moving average
B
C
- Caesar cipher
- Calculating the value of e
- Calendar
- Call a function
- Cantor set
- Carmichael 3 strong pseudoprimes
- Case-sensitivity of identifiers
- Casting out nines
- Catalan numbers
- Catalan numbers/Pascal's triangle
- Change e letters to i in words
- Changeable words
- Character codes
- Check that file exists
- Cheryl's birthday
- Chinese remainder theorem
- Chinese zodiac
- Chowla numbers
- Circles of given radius through two points
- Circular primes
- Cistercian numerals
- Closest-pair problem
- Code Golf: Code Golf
- Collect and sort square numbers in ascending order from three lists
- Collections
- Colour bars/Display
- Combinations
- Combinations with repetitions
- Comma quibbling
- Command-line arguments
- Comments
- Common list elements
- Common sorted list
- Compare a list of strings
- Compare length of two strings
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/Simple file inclusion pre processor
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Compound data type
- Concatenate two primes is also prime
- Conditional structures
- Conjugate a Latin verb
- Convert seconds to compound duration
- Conway's Game of Life
- Coprimes
- Copy a string
- Copy stdin to stdout
- Count how many vowels and consonants occur in a string
- Count in factors
- Count in octal
- Count occurrences of a substring
- Count the coins
- Cousin primes
- Create a file
- Create a two-dimensional array at runtime
- Create an executable for a program in an interpreted language
- Create an HTML table
- CSV data manipulation
- CSV to HTML translation
- Cubic special primes
- Cullen and Woodall numbers
- Cumulative standard deviation
- Currency
- CUSIP
- Cyclops numbers
D
- Damm algorithm
- Date format
- Date manipulation
- Day of the week
- Day of the week of Christmas and New Year
- Days between dates
- Deceptive numbers
- Decision tables
- Deepcopy
- Delete a file
- Department numbers
- Descending primes
- Determine if a string has all the same characters
- Determine if a string has all unique characters
- Determine if a string is collapsible
- Determine if a string is numeric
- Determine if a string is squeezable
- Determine sentence type
- Digit fifth powers
- Digital root
- Digital root/Multiplicative digital root
- Dijkstra's algorithm
- Dinesman's multiple-dwelling problem
- Disarium numbers
- Discordian date
- Dot product
- Draw a clock
- Draw a cuboid
- Draw a sphere
- Dutch national flag problem
- Dynamic variable names
E
- Eban numbers
- Emirp primes
- Empty directory
- Empty program
- Empty string
- Entropy
- Entropy/Narcissist
- Enumerations
- Environment variables
- Equilibrium index
- Erdős-primes
- Ethiopian multiplication
- Euclid-Mullin sequence
- Euler's sum of powers conjecture
- Evaluate binomial coefficients
- Even or odd
- Evolutionary algorithm
- Exactly three adjacent 3 in lists
- Execute a system command
- Execute Brain****
- Exponentiation operator
- Exponentiation order
- Exponentiation with infix operators in (or operating on) the base
- Extra primes
- Extract file extension
- Extreme floating point values