List

Passing variables to AWK

AWK has the -v option which is used to assign values to variables. For the next program, we have the general file:

$wget nishantmunjal.com/dataset/general
$cat general
The French nation, oppressed, degraded during many centuries
by the most insolent despotism, has finally awakened to a 
consciousness of its rights and of the power to which its 
destinies summon it.
mygrep.awk
{
    for (i=1; i<=NF; i++) {

        field = $i
        
        if (field ~ word) {
            c = index($0, field)
            print NR "," c, $0
            next
        }
    }
}

The example simulates the grep utility. It finds the provided word and prints its line and the its starting index. (The program finds only the first occurrence of the word.) The word variable is passed to the program using the -v option.

$ awk -f mygrep.awk -v word=the general
2,4 by the most insolent despotism, has finally awakened to a 
3,36 consciousness of its rights and of the power to which its 

We have looked for the “the” word in the text file.

Leave a Reply

Your email address will not be published. Required fields are marked *

  Posts

1 2 3
November 2nd, 2020

Churn Emails – Count Number Domain

Write a function count_message_from_domain which reads the file /cxldata/datasets/project/mbox-short.txt. This function builds a histogram using a dictionary to count how many messages have […]

November 2nd, 2020

Churn Emails – Count Number of Messages

Python Project – Churn Emails – Count Number of Messages From Each Email Address Write a function count_message_from_email which reads the file /datasets/project/mbox-short.txt.  […]

November 2nd, 2020

Churn Email: Day of the Week

Python Project – Churn Emails – Find Which Day of the Week the Email was sent Write a function find_email_sent_days which reads […]

October 20th, 2020

Compute the Compound Interest.py

Write a function with name compound_interest that takes three arguments: principle, rate and years in order. the rate is float […]

October 18th, 2020

String Data Type

A string is a sequence of characters. String Data Type str1=”hello” print(type(str1)) Ans: <class ‘str’> str2=’123′ print(type(str2)) Ans: <class ‘str’> […]

October 18th, 2020

String Library

String Replace str=”Hello Bob” print(str) rstr=str.replace(‘Bob’, ‘James’) print(rstr)   This will replace the Bob with James and store it in […]

October 17th, 2020

‘in’ statement in String

  fruits=’banana’ bana in fruits Ans: True Python Function to confirm he vowel in the given input. def is_vowel(l): return […]

September 24th, 2020

awk Marking keywords

Marking keywords In the following example, we mark Java keywords in a source file. $wget nishantmunjal.com/dataset/mark_keywords.awk # the program adds […]

September 24th, 2020

awk Rock-paper-scissors

Rock-paper-scissors Rock-paper-scissors is a popular hand game in which each player simultaneously forms one of three shapes with an outstretched […]

September 24th, 2020

awk Spell Checking

Spell checking We create an AWK program for spell checking. $wget nishantmunjal.com/dataset/spellcheck.awk BEGIN { count = 0 i = 0 […]