Shell Programming and Scripting

awk '{ print $1}' $LOGFILE | sort  | uniq -c  | sort -nr > $DEST/a.txt

 6 1.1.1.1
 3 2.2.2.2
 2 3.3.3.3
 1 4.4.4.4

awk '{a[$1]++;next}END{for (i in a){if(a[i]>5){print a[i],i}}}' $LOGFILE

while read x y; do [ $x -gt 5 ] && echo "$x $y"; done < a.txt > b.txt

 
awk '{a[$1]++;next}END{for (i in a){if(a[i]>5){print a[i],i}}}' $LOGFILE  > b.txt

 
$ awk '{a[$1]++;next}END{for (i in a){if(a[i]>5){print a[i],i}}}' test.txt 
7 2.2.2.2
7 3.3.3.3

 
$ cat test.txt 
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
2.2.2.2
3.3.3.3
2.2.2.2
3.3.3.3
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4