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up vote -4 down vote favorite

I have a Ad-blocking hosts file with 0.0.0.0 IPs pointing to URLs. How to replace 0.0.0.0 with 127.0.0.1 command line without any visual text editor ? Manually doing this with nano , vi etc. is impossible , the list have above 15k lines.

from this

0.0.0.0  c.one97adworks.com
0.0.0.0  0koryu0.easter.ne.jp
0.0.0.0  static.super-links.net

to this

127.0.0.1  c.one97adworks.com
127.0.0.1  0koryu0.easter.ne.jp
127.0.0.1  static.super-links.net

at once.

My shell bash 4.3.33.

UPDATE two down votes ? please leave comments.

share|improve this question
    
See this: thegeekstuff.com/2009/04/… –  nitishch Jun 23 at 9:56
4  
The question was probably downvoted, as it could have been solved by a minimal search effort (e.g. "text replacement linux"). Here a general answers to your question: unix.stackexchange.com/questions/112023/… –  jofel Jun 23 at 10:11
    
The downvote button is tagged as, "This question does not show any research effort; it is unclear or not useful". –  roaima Jun 23 at 14:23

3 Answers 3

up vote 0 down vote accepted

With the contents in file1.txt, the results will be in file2.txt with the following:

sed 's/^0\.0\.0\.0/127.0.0.1/' file1.txt > file2.txt
share|improve this answer
    
This would replace 0a0b0c0 etc. –  User112638726 Jun 23 at 10:10
1  
You need to escape the dots: sed 's/0\.0\.0\.0/127.0.0.1/' .... –  jofel Jun 23 at 10:12
    
Problem solved, what a stupid question!! 's/0\.0\.0\.0/127.0.0.1/' . Backslashes before dots are must. –  Arnab Jun 24 at 3:59
up vote 1 down vote

Note that since the file is structured in this way you can also do this in Vi, nano or any other text editor; simply use its find/replace command.

E.g. in nano, the simplest text editor around:

  1. open the file
  2. CTRLW then CTRLR
  3. enter 0.0.0.0 as search string
  4. enter 127.0.0.1 as replacement string
  5. A to replace all matches
  6. save the edited file
share|improve this answer
    
...and in vi, %s/^0\.0\.0\.0/127.0.0.1/ Enter followed by ZZ and Enter could also work. –  roaima Jun 23 at 14:26
up vote 1 down vote 
perl -lpe 's/^(0\.){3}0/127.0.0.1/' file > newfile

should do the trick.

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