Question

我有以下代码将ENV变量传递给AWK。

  awk 'function pr(sp, k, v){    # prints key-value pair with indentation
         printf "%s\047%s\047: \047%s\047,\n",sp,k,v; 
     }
    BEGIN {
    db_user = ENVIRON["DB_USER"]
    db_pass = ENVIRON["DB_PASS"]
    db_name = ENVIRON["DB_NAME"]
    }
     /sqlite/{ sub(/sqlite[0-9]*/,"mysql",$0) }
     /NAME/{ sp=substr($0,1,index($0,"\047")-1); 
             print sp$1" \047db_name\047,"; 
             pr(sp,"USER", db_user); pr(sp,"PASSWORD", db_pass); 
             pr(sp,"HOST","localhost"); pr(sp,"PORT",""); next 
     }1'

我可以用ENV变量替换db_name。

db_name = django

我的结果是：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'db_name',
        'USER': 'django',
        'PASSWORD': 'django',
        'HOST': 'localhost',
        'PORT': '',
      }
}

Answer 1

print中Awk语句的不正确使用问题。从此GNU Awk print()页面可以看出，您需要将变量移到引号之外以查看其扩展值。

print sp$1" \047db_name\047,"; 
#               ^^^^^^^ Awk does not understand db_name  within quotes

只需将其置于引号之外，如下所示。

print sp$1" \047"db_name"\047,"

（或）完全使用printf将格式说明符与变量分开，并执行以下操作

printf "%s %s \047%s\047,\n",sp,$1,db_name

AWK传递ENV变量

1 个答案: