Shell gawk (I) Basics

I. Command Format

Gawk options program file

Gawk options:

-F fs specifies the file delimiter used to describe the data fields in a row

-F file: Specifies the file name of the reader.

-V var = value defines the variables and default values used in the gawk program.

-Mf N specifies the maximum number of fields to be processed in the data file.

-Mr N specifies the maximum record size in the data file.

-W keyword: indicates the compatibility mode or warning level of gawk.

Ii. Read the program script from the command line

$ Gawk '{print "hello world "}'

(The default input file is STDIN)

3. Use data field variables

$0 full line of text

$ N data in the text line

The specified Delimiter is a space. By default <Strong? Http: www.bkjia.com kf ware vc "target =" _ blank "class =" keylink "> VcD4KCjxwPr/J0tTWuLaot9a49Lf7oaqhqs2ouf0gLUYgPC9wPgo8cD48aW1nIHNyYz0 = "" alt = "\">

4. Use multiple commands in the script

It can be used between variables and multiple commands.

5. Read program from file-f

To use multiple commands in a program, you only need to place one command in each line, without the need to use ";"

Vi. run scripts before and after Data Processing

Press ctrl + d to stop the input