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awk Splitting strings

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# 1  
Old 11-22-2013
awk Splitting strings
Hi All,

There is a file with a data. If the line is longer than 'n', we splitting the line on the parts and print them. Each of the parts is less than or equal 'n'.

For example:

n = 2;

"ABCDEFGHIJK" -> length 11

Results:
"AB" "CD" EF" GH" "IJ" "K"

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

Code:
#!/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

Thank's
# 2  
Old 11-22-2013
[edit] Oh, I see. You cannot dump variables inside awk like that.

In awk, $ doesn't mean variable, it means column. If you set n=2, $n would mean "column 2".

To get a variable into awk, put it before the filenames like awk '{ ... }' var="$var" filename

You can also put it before with -v: awk -v var="$var" '{ ... }' filename
# 3  
Old 11-22-2013
Try :

Code:
$ echo "ABCDEFGHIJK" | awk '{for(i=1;i<=length($1);i+=2)printf substr($1,i,2) OFS;printf RS}'
AB CD EF GH IJ K

Code:
$ echo "ABCDEFGHIJK" | awk '{for(i=1;i<=length($1);i+=n)printf substr($1,i,n) OFS;printf RS}' n=2
AB CD EF GH IJ K 

$ echo "ABCDEFGHIJK" | awk '{for(i=1;i<=length($1);i+=n)printf substr($1,i,n) OFS;printf RS}' n=3
ABC DEF GHI JK 

$ echo "ABCDEFGHIJK" | awk '{for(i=1;i<=length($1);i+=n)printf substr($1,i,n) OFS;printf RS}' n=4
ABCD EFGH IJK

# 4  
Old 11-22-2013
Code:
awk: 8: unexpected character '\'
awk: 20: unexpected charakter '\'

Last edited by Scott; 11-22-2013 at 12:30 PM.. Reason: Code tags
# 5  
Old 11-22-2013
Try nawk. If that doesn't work, tell us what you changed.
# 6  
Old 11-22-2013
Quote:
Originally Posted by booyaka
Hi All,

There is a file with a data. If the line is longer than 'n', we splitting the line on the parts and print them. Each of the parts is less than or equal 'n'.

For example:

n = 2;

"ABCDEFGHIJK" -> length 11

Results:
"AB" "CD" EF" GH" "IJ" "K"

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

Code:
#!/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

Thank's
what your function is doing ? why backslash ?
This User Gave Thanks to Akshay Hegde For This Post:
booyaka
# 7  
Old 11-22-2013
He is trying to get shell variables into awk. I showed him the correct way.
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