Linux awk Command Process log text and global variables example

How to use awk

awk ' {pattern + action} ' {filenames}

Although the operation can be complex, the syntax is always the same, where pattern represents what AWK looks for in the data, and the action is a series of commands that are executed when the matching content is found. Curly braces ({}) do not need to appear in the program at all times, but they are used to group a series of instructions according to a specific pattern. pattern is the regular expression to be represented, surrounded by slashes.

AWK Global variables specific methods are:

The code is as follows	Copy Code
Cat Access.log |awk ' begin{devname= ';} ...'

The ellipsis section is for awk processing code.

For example:

code is as follows	copy code
cat Tmp1.log | awk ' begin{start=0;tmp=0}{if ($ = = "Traceback") {Split ($0,b, "script  ");p rint b[2];start=1;tmp=$11;} else {if (start ==1) {if ($11 = = tmp) {split ($0,b, "script  ");p rint b[2];start=1;} else {start=0;print '}} '