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sed to replace <cr><cr><cr> in a line with <cr>

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# 1  
Old 06-09-2011
sed to replace <cr><cr><cr> in a line with <cr>
Hi,
Please help me with the sed command for the following scenario:

I've in abc.txt,

asdasdada<cr>aasdsad<cr><cr>asdasdfsdfs<cr><cr><cr>asdsada<cr>adasd<cr>daasdaasd<cr><cr><cr>


I want a sed command to do

asdasdada<cr>aasdsad<cr>asdasdfsdfs<cr>asdsada<cr>adasd<cr>daasdaasd<cr>


please help me
# 2  
Old 06-09-2011
Assuming your file does not contain any '@'
otherwise, choose another character that does not already appear in your file (#,µ, ...)

Code:
sed 's/<cr>/@/g;s/@@*/@/g;s/@/<cr>/g' infile

# 3  
Old 06-09-2011
something like this:

Code:
 
sed 's/<cr>[<cr>]*/<cr>/g' input_file

# 4  
Old 06-09-2011
Thanks for the reply.
If possible, could you please let me know what is wrong with

sed "s/<cr>+/<cr>/g" infile.txt

or

sed "s/\(<cr>\)+/<cr>/g" infile.txt

Thanks in advance.
# 5  
Old 06-09-2011
Please go through this link. I'm sure it will better explain than me:

Sed - An Introduction and Tutorial
# 6  
Old 06-09-2011
Caveat : for some uncommon character, you may need to force the bracket enclosing to be handled correctly :

Code:
# echo "asdasdada<cr>aasdsad<cr><cr>asdasdfsdfs<cr><cr><cr>asdsada<cr>adasd<cr>daasdaasd<cr><cr><cr>" | sed 's/<cr>/µ/g;s/µµ*/µ/g;s/µ/<cr>/g'
asdasdada<cr>aasdsad<cr>asdasdfsdfs<cr><cr>asdsada<cr>adasd<cr>daasdaasd<cr><cr>

---> Here the µ has not been handled correctly

Whereas in the 2 following case, it is handled correctly :
Code:
# echo "asdasdada<cr>aasdsad<cr><cr>asdasdfsdfs<cr><cr><cr>asdsada<cr>adasd<cr>daasdaasd<cr><cr><cr>" | sed 's/<cr>/µ/g;s/µ[µ]*/µ/g;s/µ/<cr>/g'
asdasdada<cr>aasdsad<cr>asdasdfsdfs<cr>asdsada<cr>adasd<cr>daasdaasd<cr>

Code:
# echo "asdasdada<cr>aasdsad<cr><cr>asdasdfsdfs<cr><cr><cr>asdsada<cr>adasd<cr>daasdaasd<cr><cr><cr>" | sed 's/<cr>/µ/g;s/µ[.µ.]*/µ/g;s/µ/<cr>/g'
asdasdada<cr>aasdsad<cr>asdasdfsdfs<cr>asdsada<cr>adasd<cr>daasdaasd<cr>

---------- Post updated at 02:00 PM ---------- Previous update was at 01:53 PM ----------

Quote:
Originally Posted by skpvalvekar
Thanks for the reply.
If possible, could you please let me know what is wrong with

sed "s/<cr>+/<cr>/g" infile.txt

or

sed "s/\(<cr>\)+/<cr>/g" infile.txt

Thanks in advance.
+ or * refer to the preceding character or [character list] they do NOT refer to the preceeding \(strings\)

---------- Post updated at 02:09 PM ---------- Previous update was at 02:00 PM ----------

Quote:
Originally Posted by panyam
something like this:

Code:
 
sed 's/<cr>[<cr>]*/<cr>/g' input_file

@Panyam
Your code is dangerous and may lead to unexpected loss, consider :

Code:
# echo "I<cr><cr>like<cr><cr>roasted <cr><cr>apple<cr><cr><cr>crumble<cr>."  | sed 's/<cr>[<cr>]*/<cr>/g'
I<cr>like<cr>oasted <cr>apple<cr>umble<cr>.

Where did go the 'r' of 'roasted' and 'cr' of 'crumble' ?????

Smilie
Last edited by ctsgnb; 06-09-2011 at 09:14 AM..
# 7  
Old 06-09-2011
Quote:
Originally Posted by ctsgnb
@Panyam
Your code is dangerous and may lead to unexpected loss, consider :

Code:
# echo "I<cr><cr>like<cr><cr>roasted <cr><cr>apple<cr><cr><cr>crumble<cr>."  | sed 's/<cr>[<cr>]*/<cr>/g'
I<cr>like<cr>oasted <cr>apple<cr>umble<cr>.

Where did go the 'r' of 'roasted' and 'cr' of 'crumble' ?????

Smilie
I believe below one would help to resolve
Code:
sed 's/\(<cr>\)\1*/<CR>/g' inputfile

These 2 Users Gave Thanks to michaelrozar17 For This Post:
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