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[图文]linux下查找端口号对应的服务名

2015/10/20 作者:佚名 来源: 本站原创
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  根据端口号查找对应的服务名

  1)grep -w 端口号 /etc/services

  2)grep "\b端口号\b" /etc/services

  以2049端口为例,执行grep -w 2049 /etc/services或grep "\b2049\b" /etc/services 即可查找到其对应的服务名为nfs

  grep -w 2049 /etc/services

  nfs 2049/tcp nfsd shilp # Network File System

  nfs 2049/udp nfsd shilp # Network File System

  nfs 2049/sctp nfsd shilp # Network File System

  # grep "\b2049\b" /etc/services

  nfs 2049/tcp nfsd shilp # Network File System

  nfs 2049/udp nfsd shilp # Network File System

  nfs 2049/sctp nfsd shilp # Network File System

  其中-w表示只显示全字符合的列,即精确匹配;"\b"表示匹配一个字边界,即字与空格间的位置。例如,“er\b”匹配“never”中的“er”,但不匹配“verb”中的“er”(若匹配“verb”中的“er”可使用"\B"进行非字边界匹配)。

  根据服务名查找对应的端口号

  1)grep -w 服务名 /etc/services

  2)grep "\b服务名\b" /etc/services

  以nfs服务为例,执行grep -w nfs /etc/services 或grep "\bnfs\b"/etc/services即可查找到其对应的端口号为2049

  # grep -w nfs /etc/services

  nfs 2049/tcp nfsd shilp # Network File System

  nfs 2049/udp nfsd shilp # Network File System

  nfs 2049/sctp nfsd shilp # Network File System

  # grep "\bnfs\b" /etc/services

  nfs 2049/tcp nfsd shilp # Network File System

  nfs 2049/udp nfsd shilp # Network File System

  nfs 2049/sctp nfsd shilp # Network File System

  其中-w表示只显示全字符合的列,即精确匹配;"\b"表示匹配一个字边界,即字与空格间的位置。\bnfs\b即为精确匹配nfs。