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Old 06-01-2004, 05:11 AM   #1
blubbfish
LQ Newbie
 
Registered: Feb 2004
Posts: 29

Rep: Reputation: 15
Question bash Problem with "sed" command


Hi there,
i want to search and replace strings with sed and normally its no prob but now i am at a point where i dont know further perhaps u could help me.
i want to cat a file and replace certain strings with "html" code but with the special sings in html my bash doesnt take the string as i like.
here is the cat'ed file:
#-------------cat.file-------------------
70
0
0
0
0
70
70
0
0
0
70
#--------------end---------------------

i tried in this one to replace the 70's with the "<img border="0" src="Warning.gif" width="126" height="26"></p>" html code

so i took this command:
cat cat.file | sed s/70/"<img border="0" src="Warning.gif" width="126" height="26"></p>"/g

but no chance he won't replace.....

PLEASE help me



Blubbfish
 
Old 06-01-2004, 05:54 AM   #2
slano
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Registered: May 2003
Distribution: slack,gentoo
Posts: 57

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hi,

you need to to escape characters ", >, < and / so your shell will bypass them.

Code:
cat cat.file | sed s/70/"<img border=\"0\" src=\"Warning.gif\" width=\"126\" width=\"26\"><\/p>"/g

Last edited by slano; 06-01-2004 at 10:15 AM.
 
Old 06-01-2004, 06:52 AM   #3
blubbfish
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Registered: Feb 2004
Posts: 29

Original Poster
Rep: Reputation: 15
how do i escape special characters?


Sorry i just did not realize that u postet the new code there ... damn where is my brain today...need more coffee



Thanks for your help it works perfectly
But one question is still there
sed s/70/"<img border=\"0\" src=\"Warning.gif\" width=\"126\" width=\"26\"\>\<\/p\>"/g
why dont i have to uncomment the first < sign ???? doesnt this one try to pipe the word image into something? (Sorry but i'am a )

Last edited by blubbfish; 06-01-2004 at 07:11 AM.
 
Old 06-01-2004, 10:14 AM   #4
slano
Member
 
Registered: May 2003
Distribution: slack,gentoo
Posts: 57

Rep: Reputation: 16
you just need to escape special characters. I've edited the code to be "more correct"

everything between " and " is treated as one string by shell, when you want another " in the string you have to escape it.
also you have to escape / in the string because sed thinks it's the end of the search part in s/
 
  


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