awk Data Processing Tips

For data analysis or statistics, if the amount of data is small, we can quickly process with awk, here are some tips one, timestamp conversion date to timestamp: date-d "20150315" "+%s" Timestamp Date: date-d @1426565428 "+ %y-%m-%d " Two, data statistics processing random take 100 number
awk ' Begin{srand ()} {print rand () "" $2.txt | Sort-k1 | head-100
Take intersection
Cat 1.txt 2.txt | Sort | Uniq-d
Fetch and set
Cat 1.txt 2.txt | Sort | Uniq Remove Intersection
Cat 1.txt 2.txt | Sort | Uniq-u The most repeated occurrences of the number
Cat 1.txt 2.txt | Sort | uniq-c | Sort-r-k1 | head-100
Find average
awk ' {sum+=$1} end{print "average=" Sum/nr} ' 1.txt

third, file processing copy file a few lines sed-n ' 1,10p ' 1.txt > Copy.txt

awk Data Processing Tips