Linuxawk operator (arithmetic operator, value assignment operator, relational operator, logical operation

As one of the excellent tools for text processing, awk has its own rich operators. The following is a summary of all operators. It can be divided into arithmetic operators, value assignment operators, relational operators, logical pre-algorithms, and regular operators.

I. INTRODUCTION to operators

Operator	Description
Value assignment operator
= + =-= * =/= % = ^ = ** =	Assignment statement
Logical operators
|	Logic or
&&	Logic and
Regular operators
~ ~!	Match regular expressions and do not match regular expressions
Relational operators
<<=>>=! ===	Relational operators
Arithmetic operators
+-	Add, subtract
*/&	Multiplication, division and remainder
+ -!	Mona1 addition, subtraction, and non-logical
^ ***	Power
++ --	Increase or decrease as a prefix or suffix
Other operators
$	Field reference
Space	String connector
? :	C-condition expression
In	Whether a key value exists in the array

Note: The awk operator is basically the same as the C language. Expressions and functions are basically the same

II. instance introduction

Awk assignment operator

Copy codeThe code is as follows:
A + = 5; equivalent to: a = a + 5; other similar

Awk logical operators

Copy codeThe code is as follows:
[Chengmo @ localhost ~] $ Awk 'In in {a = 1; B = 2; print (a> 5 & B <= 2), (a> 5 | B <= 2 );}'
0 1

Awk regular operators

Copy codeThe code is as follows:
[Chengmo @ localhost ~] $ Awk 'In in {a = "100 testa"; if (~ /^ 100 */) {print "OK ";}}'
OK

Awk relational operators

Copy codeThe code is as follows:
For example:> <can be used for string comparison or numerical comparison. The key is that if the operand is a string, it is converted to string comparison. Both of them are numeric values. String comparison: Compare strings in ascii order.

[Chengmo @ localhost ~] $ Awk 'In in {a = "11"; if (a> = 9) {print "OK ";}}'

[Chengmo @ localhost ~] $ Awk 'In in {a = 11; if (a> = 9) {print "OK ";}}'
OK

Awk arithmetic operators

Copy codeThe code is as follows:
It indicates that all operations are performed as arithmetic operators, the operands are automatically converted to numerical values, and all non-numeric values are changed to 0.
[Chengmo @ localhost ~] $ Awk 'In in {a = "B"; print a ++, ++ ;}'
0 2

Other operators

Copy codeThe code is as follows:
? : Operator
[Chengmo @ localhost ~] $ Awk 'In in {a = "B"; print a = "B "? "OK": "err ";}'
OK

In operator
[Chengmo @ localhost ~] $ Awk 'In in {a = "B"; arr [0] = "B"; arr [1] = "c"; print (a in arr );}'
0
[Chengmo @ localhost ~] $ Awk 'In in {a = "B"; arr [0] = "B"; arr ["B"] = "c"; print (a in arr );}'
1
In operator to determine whether the key value exists in the array.