语法

awk [ -F re] [parameter...] ['pattern {action}' ] [-f progfile][in_file...]

• 获得普通外部变量

• [xingxing.dxx@30_28_6_20 ~]$ test='test code'
  
  [xingxing.dxx@30_28_6_20 ~]$ echo | awk '{print test}' test="$test"
  
  test code 

• BEGIN快中获取变量

• [xingxing.dxx@30_28_6_20 ~]$ test='test code'
  
  [xingxing.dxx@30_28_6_20 ~]$ echo | awk -v test="$test" 'BEGIN{print test}'
  
  test code

  [xingxing.dxx@30_28_6_20 ~]$ echo | awk -v test="$test" '{print test}' 
  test code

• 获取环境变量

• [xingxing.dxx@30_28_6_20 ~]$ awk  'BEGIN{for (i in ENVIRON) {print i"="ENVIRON[i];}}'
  
  TERM=linux
  
  G_BROKEN_FILENAMES=
  
  SHLVL=