awk Script,

Shell Programming and Scripting
1

Hi All,

I have to do one simple script in AWK. I must to show all users in the group and the group name is called from the keyboard.

I know that I can get groups etc. from /etc/group file.

#!/bin/bash 
echo "Group name: " 
read name   
awk '{split($0,array,":")} {if(array[1] == \"$name\") {print array[3]}}' /etc/group

There is something wrong with the if instruction, but I don't have idea how to do is correctly.

Thank's

2

Define awk variable and use it:

awk -v N="$name" '{split($0,array,":");if(array[1] == N){print array[3]}}' /etc/group
3

Try

if(array[1] ~ /'$name'/)

OR

$ awk -v name=$name '{split($0,array,":");if(array[1] == name )print array[3]}' /etc/group
4

An easier way to get the group members is this:

awk -F: -v n="$name" '$1==n{print $4}' /etc/group
5 
grep -E "^$name:" /etc/group | { IFS=: read _ _ _ users ; echo $users; }
6

Thank's. Now another problem with another Script but all the time in AWK.

So, I have to write script that will split every line which is longer than 'n' on a 'k' parts, and all of the parts must be <= n

Code, but there are some errors. What's the problem?

#!/bin/bash

echo "Max length of line: "
read n

awk '
    function pomnoz(a, b){
        return 1/(1/a / b);
    };
    
    { MAX = $n };
    {
        LEN = length(\$0);
        
        if(LEN % MAX != 0){
            N = (LEN - (LEN % MAX)) / MAX + 1;
        };
        
        if(LEN % MAX == 0){
            N = LEN / MAX;
        };
        
        for(x = 0; x < N; x++){
            POS = (pomnoz(x, MAX) + 1);
            STR = substr(\$0, POS, MAX);
            {print STR};
        }
    }
' data
7

Please open a new thread for a new problem, and, while doing that, explain a bit more what you want to achieve and where you come from. Actually, I'm struggling with both your request text and your code snippet. What's the role of " 'k' parts" ? What's your function doing (other than multiplying its two parameters, without div zero checking)? Please be aware that $n in an awk script does NOT refer to a shell variable n . In your above code, n is not assigned a value and thus $n refers to the entire input string.