Simple examples of Text Analysis Tool awk and text awk

Simple examples of Text Analysis Tool awk and text awk

Create a file: vim hi

 

Take 2nd fields and 3rd fields:

Awk '{print $2, $3}' hi note {}, CommaWill be converted to a space in the output.

 

Character Description:

 

Display the entire line:

 

 

Field separator:-F

 

Built-in variable: NF: number of fields. $ NF indicates the last field.

 

NR: number of rows

 

/Regular expression/: only the rows that can be matched by the pattern here are processed.

 

Backend: awk '! /^ John/{print $2} 'hi

 

The preceding statement indicates that if the third field is greater than or equal to 500, the first and third fields are used.

 

Determine whether the last field is/bin/bash. If yes, print the first and last fields.

 

Perform pattern matching

 

Cat hi

Match row range

 

Get row range:

 

If condition judgment statement: determines whether the value of the third field is greater than 500

 

Character replacement:

Echo "this is a test" | awk 'gsub ("test", "abd ")'

 

Cat hi

While loop:

 

NF indicates the number of fields in the current row. length is a function that obtains the character length of $ I.

 

Awk '/^ tom/{I = 1; while (I <= NF) {if (length ($ I)> = 4) {print $ I, length ($ I)}; I ++} 'hi

The if statement is nested in the while loop.

 

The preceding while statement can also be replaced by a for loop statement.

Awk '/tom/{for (I = 1; I <= NF; I ++) {print $ I, length ($ I)}' hi