Linux Common topics

1. Replace the ABC in a file with all ABC-containing lines into Def, then output the first and third columns

Cat Abc.txt | GREP ABC | Sed ' s/abc/def/g ' | awk ' {print $1,$3} ' awk ' $ ~/abc/{gsub ("abc", "Def", $ A); print $, $ $} ' Abc.txt

2. Count the 2 IPs with the largest number of accesses in a log file

Cat Access.log | awk ' {print '} ' | Sort | uniq-c | Sort-nr | Head-n 2awk ' {ips[$1]++} end{for (IP in IPs) {print IP, Ips[ip]}} ' Access.log | SORT-K2NR | Head-n2

3. Generate a file that contains the date of the last 30 days

For I in $ (seq 1 30); Do d=$ (date-d "$i days Ago" +%y-%m-%d); Echo $d; Done

　

Linux Common topics