测试文件names

Tom Savage 100

Molly Lee 200

John 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

演示样例二：

$ 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

总结：学到两点东西

1、awk匹配和print能够写到文件。通过-f參数调用

2、awk根据匹配的行，以便从上到下