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fedorqui
Asked: 2020-07-12 06:05:55 +0800 CST 2020-07-12 06:05:55 +0800 CST

How do I do an if else in Awk?

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It often happens to me that I have errors when doing if-else, I don't know when to put semicolons or when to use curly braces.

What is the way to write a if-elif-elsecorrect in Awk?

if

1 Answers

  1. Best Answer

    The structure of a condition ifin Awk is of the form:

    if (condicion) { se hacen unas cosas }

    If you want to put a "counterpart" in the form of if-elseyou can say:

    if (condicion) { se hacen unas cosas }
else           { se hacen otras cosas }

    Or even add some elifof the form:

    if (condicion)   { se hacen unas cosas }
elif (condicion) { se hacen ciertas cosas }
else             { se hacen otras cosas }

    As usual in Awk, if a block has only one statement, you can omit the curly braces and simply say:

    if (condicion)   una_cosa
elif (condicion) cierta_cosa
else             otra_cosa

    Of course, if you are working on a single line, remember that each line break must have its corresponding semicolon, so you would say:

    awk '{if (condicion) una_cosa; elif (condicion) cierta_cosa; else otra_cosa}'

    For example:

    $ awk 'BEGIN {var=3; if (var>2) print 1; else print 3}'
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