Awk

Overview

AWK 내용 정리

Options

-F

Delimiter 설정을 바꾼다. 기본값은 ' '(공백)이다. <source lang=bash> $ cat test.txt | awk -F':' '{print $1}' </source>

Statement

if

<source lang=awk> if (conditional-expression) { action1; action2; } </source>

for

<source lang=awk> for (initialization; condition; increment)

 body

</source>

Example <source lang=awk> awk ' {

   for (i = 1; i <= 3; i++)
       print $i

}' inventory-shipped </source>

while

<source lang=awk> while (condition)

 body

</source>

Example <source lang=awk> awk ' {

   i = 1;
   while (i <= 3) {
       print $i;
       i++;
   }

}' inventory-shipped </source>

Builtin variables

NR

지정된 숫자만큼 입력된 라인을 스킵한다.

<source lang=awk> $ sudo asterisk -rx "core show taskprocessors" | awk 'NR>2 {if ($3 > 100) {print $1}}' </source>

See also

• https://www.gnu.org/software/gawk/manual/html_node/index.html - The GNU Awk User’s Guide