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首页 > 解决方案 > 如何删除 awk 中的空格和换行符以进行字符串插入？

string - 如何删除 awk 中的空格和换行符以进行字符串插入？

问题描述

所以，我有这样的 apache2 配置文件：

<Proxy balancer://mycluster>
             BalancerMember "ajp://10.x.x.xxx:8009" route=node1 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60
             BalancerMember "ajp://10.x.x.xx:8009" route=node2 loadfactor=1 keepalive=on  ttl=300 max=400 timeout=300 retry=60
             BalancerMember "ajp://10.x.x.xxx:8009" route=node3 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60
             BalancerMember "ajp://10.x.x.xx:8009" route=node4 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60
             BalancerMember "ajp://10.x.x.xx:8009" route=node5 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60
             BalancerMember "ajp://10.x.x.xx:8009" route=node6 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60
             BalancerMember "ajp://10.x.x.xxx:8009" route=node7 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60
            ProxySet lbmethod=byrequests
    </Proxy>

我想要做的是在行之前插入一个带有 # 的新 BalancerMember ProxySet lbmethod=byrequests。我将使用 shell 脚本来执行此操作。

所以它应该看起来像： #BalancerMember "ajp://10.x.x.xxx:8009" route=node8 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60

我尝试过的是：

awk -v s1='"' -v ip="10.0.7.1" -v no="8" '
/ProxySet lbmethod=byrequests/{
print "\n\t\t#BalancerMember " s1 "ajp://" ip ":8009" s1 " route=node" no " loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60"
next
}
1' /tmp/000-site.conf > /tmp/000-site.conf.tmp && mv /tmp/000-site.conf.tmp /tmp/000-site.conf
}

因此，上述解决方案可以正常工作，但会留下我不想要的换行符。我试过删除 ORS。

标签： stringbashshellawknewline

解决方案

您能否尝试以下操作。（创建其中包含新行值的line变量）awk

awk -v line='#BalancerMember "ajp://10.x.x.xxx:8009" route=node8 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60' '
/ProxySet lbmethod=byrequests/{
  print "             " line ORS $0
  next
}
1'  Input_file

说明：在此处添加对上述代码的说明。

awk -v line='#BalancerMember "ajp://10.x.x.xxx:8009" route=node8 loadfactor=1 keepalive=on ttl=300 max=400 timeout=300 retry=60' ' ##Creating variable line.
/ProxySet lbmethod=byrequests/{     ##Checking condition here if a line has string ProxySet lbmethod=byrequests then do following.
  print "             " line ORS $0 ##Printing space then variable line ORS and then print currrent line value then.
  next                              ##Mentioning next out of the box keyword to skip all further statements.
}
1                                   ##Mentioning 1 will print the lines here, awk works on condition then action, making condition true here, print action will happen.
'  Input_file                       ##Mentioning Input_file name here.

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