I need to find max element of third number in IP address which is 25! And after that relating to max third number I need to find max fourth number which is 237 (6th line).
I tried to split up IP address in 4 parts such as A B C D... And then I work only with C and D but my code gives me C =2 which is not max ;( D does now work at all ;( Help me please to fix my little piece of code ;( thanks
Code:
max=0
sort num1 | { IFS="." read A B C D;
for i in ` wc -l `
do
if [ "${C}" > "${max}" ]
then
max="${C}"
fi
echo $max; done
for i in ` wc -l `
do
if [ $max "$D" > "$lastmax"]
then
lastmax="$D"
fi done
echo $lastmax
}
}~
There are several problems here, including, but not necessarily limited to:
Sorting a file alphanumerically using the entire input line as the only sort key doesn't serve any useful purpose when you're trying to compare numeric values in the 3rd and 4th period separated fields.
Your 1st for loop's do doesn't have a matching done.
The wc -l command in both of your for loops will hang waiting for the user to type in input (since no file operands are given on the command line).
I don't see how counting the number of lines in a file (which is what wc -l does) will be of any use in solving this problem.
In the test command [ $max "$D" > "$lastmax"] you need a space before the closing square bracket.
In both of your test commands, the > operator performs an alphanumeric comparison. You need to use the -gt operator to compare numeric comparisons. (For example the command:
Code:
if [ "7" > "100 ]
then echo "7 is greater than 100"
fi
prints:
Code:
7 is greater than 100
but the command:
Code:
if [ "7" -gt "100 ]
then echo "7 is greater than 100"
fi
produces no output.)
The scripts that RudiC and I provided before should give you alternative solutions to this problem.
We are serious about using CODE tags. Leaving out the code tags makes the above (poorly formatted single-line) command appear to be a multi-line command with syntax errors.
Last edited by Don Cragun; 10-05-2013 at 05:21 PM..
We are serious about using CODE tags. Leaving out the code tags makes the above (poorly formatted single-line) command appear to be a multi-line command with syntax errors.
No, combining bits and pieces of RudiC's suggested code, and CarloM's (or my corrected version of CarloM's) code gives you a hybrid solution that does runs slower and only considers the contents of one file.
I would still suggest my solution (slightly modified to use your new set of files):
Thank you, now its clear. One more thing... I want to have a condition statement that if fourth oct of IP is 254 then just make it 0 and increment third oct. So xxx.xxx.3.254 => next xxx.xxx.4.0
I just added condition to awk but it doesnt seem to work...
I've the following data set. I would like to look at the column 3 and only use the rows which has the max value for column 3
Can we use the awk or sed to achieve it.
10 2 10 100
11 2 20 100
12 2 30 100
13 2 30 100
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I have this userid:
# cat /etc/shadow | grep mysql
mysql:$1$O12345678901234/.:123456:0::14:::
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If it's like this below
mysql:$1$O12345678901234/.:123456:0:99999:14:::
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Hi All,
I want to choose the maximum value from a column values.
eg -
234
23
567
43
2456
5
678
8978
from thses values how to choose the max value ?
thanks.
roger. (3 Replies)
I have a file like:
<word> 5
<word> 3
<word> 5
<word> 2
<word> 6
<word> 8
<word> 12
and i need to know the max value of the second column, in this case 12.
Plz help me!
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10-05-2013
