Simple Awk Question: If Syntax

natdeamer · #1 (**permalink**) 09-10-2007

what is the correct syntax for an if statement:

1. {} around the code that you want to run, if the if is true
{if (($34 != "") && (NR != 1) && ($1 != "F"))
{
is_number(34,"S1002a")
less_than(34, 0, "S1002a")
}
}

2. or with no {}
{if (($34 != "") && (NR != 1) && ($1 != "F"))
is_number(34,"S1002a")
less_than(34, 0, "S1002a")
}

Thanks

Perderabo · #2 (**permalink**) 09-10-2007

Consider this following code:

Code:

$ cat data2
6 sjjs
8 akakaka
9 akakaka
$ awk '{ if ($1 == 8) print NR, $0 }' data2
2 8 akakaka
$

So the "if" statement works without "{}" around the "print NR, $0" statement. But it also works with "{}":

Code:

$ awk '{ if ($1 == 8) {print NR, $0} }' data2
2 8 akakaka
$

If this case the "{}" is pretty useless. But if we want two statements to depend on the "if" condition, then we really need those "{}" to group the statements.

Code:

$ awk '{ if ($1 == 8) print NR, $0 ; print "------" }' data2
------
2 8 akakaka
------
------
$ awk '{ if ($1 == 8) {print NR, $0 ; print "------"} }' data2
2 8 akakaka
------
$

We probably wanted the second result.

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