(gawk.info) Operator Summary
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Operators
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The operators in `awk', in order of decreasing precedence, are:
`(...)'
Grouping.
`$'
Field reference.
`++ --'
Increment and decrement, both prefix and postfix.
`^'
Exponentiation (`**' may also be used, and `**=' for the assignment
operator, but they are not specified in the POSIX standard).
`+ - !'
Unary plus, unary minus, and logical negation.
`* / %'
Multiplication, division, and modulus.
`+ -'
Addition and subtraction.
`SPACE'
String concatenation.
`< <= > >= != =='
The usual relational operators.
`~ !~'
Regular expression match, negated match.
`in'
Array membership.
`&&'
Logical "and".
`||'
Logical "or".
`?:'
A conditional expression. This has the form `EXPR1 ? EXPR2 :
EXPR3'. If EXPR1 is true, the value of the expression is EXPR2;
otherwise it is EXPR3. Only one of EXPR2 and EXPR3 is evaluated.
`= += -= *= /= %= ^='
Assignment. Both absolute assignment (`VAR=VALUE') and operator
assignment (the other forms) are supported.
Expressions.
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