awk學習總結（二） How awk works and awk CMD in a file

一個測試檔案names

Tom Savage 100Molly Lee 200John Doe 300

$0 代表file的整行; $1,第一列;$2,第二列......

$ awk '/Tom/{print $0}' names

$ Tom Savage 100

樣本二：

$ awk '{print $1,$3}' names$ Tom 100$ Molly 200$ John 300

The test files  employees and awkfile as following:

$ cat employees   Tom       Jones      4424     5/12/66     543354   Mary      Adams      5346     11/4/63     28765   Sally     Chang      1654     7/22/54     650000   Billy     Black      1683     9/23/44     336500

$ cat awkfile  /^Mary/{print "Hello Mary!"} {print $1, $2, $3}

$ awk –f awkfile employees   Tom Jones 4424   Hello Mary!   Mary Adams 5346   Sally Chang 1654   Billy Black 1683

總結：學到兩點東西

1、awk匹配和print可以寫到檔案，通過-f參數調用

2、awk按照行依次從上到下匹配