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I have file named 'server.cfg'. There is string 'port 7788', 7788 can be any number ( 7799, 7711 and so on ), i need to change that number which goes after port to 7777, how can i do that? I need ssh command, using debian. Thanks.

hek2mgl
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user3822243
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  • Try `man sed` and go through some examples. You'll find it pretty easy. – jaypal singh Jul 10 '14 at 13:52
  • possible duplicate of [How do I use sed to change my configuration files, with flexible keys and values?](http://stackoverflow.com/questions/5955548/how-do-i-use-sed-to-change-my-configuration-files-with-flexible-keys-and-values) – mc110 Jul 19 '14 at 06:46

3 Answers3

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You can use sed, like this:

sed -i 's/port \([0-9]*\)/port 7777/' server.cfg
hek2mgl
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Sounds like you need sed. If you want to change one specific instance use:

$ sed -i 's/port 7788/port 7777/g' server.cfg

If you want to change an unknown number multiple times use:

$ sed -i 's/port \([0-9]*\)/port 7777/' server.cfg

If you want to change only the first instance found, use:

$ sed -i '0,/port \([0-9]*\)/{s/port \([0-9]*\)/port 7777/}' server.cfg
wbt11a
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You should use a regegex with sed :

sed -i 's/port [[:digit:]]\{4\}/port 7777/g' server.cfg

This will replace all the port number (with 4digits) by 7777

Fabien
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