Examples of awk usage

1. Count the number of occurrences of each number in the following text

[liuwei@test tmp] $cat 1.log 1 22 33 4100 1 100 100 [liuwei@test tmp] $awk'{for (iTun1) I = "20:00:00" & & $3 = "20:00:00" & & $3 / {print $5}'| awk-F:'{s [$1] + +} END {for (key in s) print key,s [key]}'# method 2, using the split function-- > you need to know what each parameter of the split function means. This method looks very high-end netstat-tan | awk'/ ^ tcp\ > / {split ($5line IP, ":") S [ip [1]] + +} END {for (key in s) print key,s [key]} 'knowledge points: the use of the split function in awk, which in this case indicates that the contents of $5 are separated by colons and stored in the ip array

7. The data in file an is required to replace the word xxx in file b in turn.

[liuwei@test tmp] $cat a

Aaa

Bbb

Ccc

Ddd

[liuwei@test tmp] $cat b

111 xxx

222 xxx

333 xxx

444 xxx

# method 1, use getline function to implement [liuwei@test tmp] $awk'{getline I