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more和less编辑模式


今天在用less浏览/etc/services里的服务端口时无意中发现。在less查看文件的同时居然可以进入VI模式编辑原文件。经过测试,more也有相同的功能。我搜索了百度和google好像没有人发现和发表过这内容。以后我们可以先用less浏览文件再修改会不会更好呢?

希望发出来和中国的linuxer可以共享学习一下。

有什么不对之处,敬请谅解。也可以接受轻喷!



这里为方便看我显示了行号,可以看出左下角显示的是文件名‘services’处于浏览阶段。

[root@sean2 tmp]# less -N services

      1 # /etc/services:

      2 # $Id: services,v 1.48 2009/11/11 14:32:31 ovasik Exp $

      3 #

      4 # Network services, Internet style

      5 # IANA services version: last updated 2009-11-10

      6 #

      7 # Note that it is presently the policy of IANA to assign a single well-kn      7 own

      8 # port number for both TCP and UDP; hence, most entries here have two ent      8 ries

      9 # even if the protocol doesn‘t support UDP operations.

     10 # Updated from RFC 1700, ``Assigned Numbers‘‘ (October 1994).  Not all po     10 rts

     11 # are included, only the more common ones.

     12 #

     13 # The latest IANA port assignments can be gotten from

     14 #       http://www.iana.org/assignments/port-numbers

     15 # The Well Known Ports are those from 0 through 1023.

     16 # The Registered Ports are those from 1024 through 49151

     17 # The Dynamic and/or Private Ports are those from 49152 through 65535

     18 #

     19 # Each line describes one service, and is of the form:

     20 #

     21 # service-name  port/protocol  [aliases ...]   [# comment]

     22 

services 



这里按下v就进入了Vi模式,左下出现了总行数。如下:

# /etc/services:

# $Id: services,v 1.48 2009/11/11 14:32:31 ovasik Exp $

#

# Network services, Internet style

# IANA services version: last updated 2009-11-10

#

# Note that it is presently the policy of IANA to assign a single well-known

# port number for both TCP and UDP; hence, most entries here have two entries

# even if the protocol doesn‘t support UDP operations.

# Updated from RFC 1700, ``Assigned Numbers‘‘ (October 1994).  Not all ports

# are included, only the more common ones.

#

# The latest IANA port assignments can be gotten from

#       http://www.iana.org/assignments/port-numbers

# The Well Known Ports are those from 0 through 1023.

# The Registered Ports are those from 1024 through 49151

# The Dynamic and/or Private Ports are those from 49152 through 65535

#

# Each line describes one service, and is of the form:

#

# service-name  port/protocol  [aliases ...]   [# comment]


tcpmux          1/tcp                           # TCP port service multiplexer

tcpmux          1/udp                           # TCP port service multiplexer

rje             5/tcp                           # Remote Job Entry

"services" 10774L, 641020C



20行是个空行,我在这行加入字符,保存退出看源文件是否被修改。

      3 #

      4 # Network services, Internet style

      5 # IANA services version: last updated 2009-11-10

      6 #

      7 # Note that it is presently the policy of IANA to assign a single well-kn        own

      8 # port number for both TCP and UDP; hence, most entries here have two ent        ries

      9 # even if the protocol doesn‘t support UDP operations.

     10 # Updated from RFC 1700, ``Assigned Numbers‘‘ (October 1994).  Not all po        rts

     11 # are included, only the more common ones.

     12 #

     13 # The latest IANA port assignments can be gotten from

     14 #       http://www.iana.org/assignments/port-numbers

     15 # The Well Known Ports are those from 0 through 1023.

     16 # The Registered Ports are those from 1024 through 49151

     17 # The Dynamic and/or Private Ports are those from 49152 through 65535

     18 #

     19 # Each line describes one service, and is of the form:

     20 # I am here,this is a test line.

     21 # service-name  port/protocol  [aliases ...]   [# comment] 

     22         

     23 tcpmux          1/tcp                           # TCP port service multip        lexer

-- INSERT --



用vi进入文件查看。文件确实已被修改!

[root@sean2 tmp]# vim services 


    1 # /etc/services:

    2 # $Id: services,v 1.48 2009/11/11 14:32:31 ovasik Exp $

    3 #

    4 # Network services, Internet style

    5 # IANA services version: last updated 2009-11-10

    6 #

    7 # Note that it is presently the policy of IANA to assign a single well-know      n

    8 # port number for both TCP and UDP; hence, most entries here have two entri      es

    9 # even if the protocol doesn‘t support UDP operations.

   10 # Updated from RFC 1700, ``Assigned Numbers‘‘ (October 1994).  Not all port      s

   11 # are included, only the more common ones.

   12 #

   13 # The latest IANA port assignments can be gotten from

   14 #       http://www.iana.org/assignments/port-numbers

   15 # The Well Known Ports are those from 0 through 1023.

   16 # The Registered Ports are those from 1024 through 49151

   17 # The Dynamic and/or Private Ports are those from 49152 through 65535

   18 #

   19 # Each line describes one service, and is of the form:

   20 # I am here,this is a test line.          

   21 # service-name  port/protocol  [aliases ...]   [# comment]

   22           

:set nu                             



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