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How to remove certain lines using sed?

 
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# 1  
Old 05-30-2013
How to remove certain lines using sed?
Hi I have the following kind of line sin my file .

print ' this is first'.

Code:
print ' this is firs and next '
  ' line continuous '. -- this is entire print line.

print ' this is first and next '
' line continuous and'
'still there now over'. -- this 3lines together a single print line.

Now i need to delete such all lines in my file in unix. Plese help me out is there any possible way to do this using sed.

Any help/idea would be a great help.

thanks in advance...
Last edited by Scott; 05-30-2013 at 12:54 PM.. Reason: Please use code tags - and post in the appropriate sub-forum (moved)
# 2  
Old 05-30-2013
Sivajee,

Check this out:
You have to use something like this to delete all the matching lines with the pattern:
Code:
sed '/this is fir/d' file





Code:
# cat -n file
     1  print ' this is firs and next '
     2    ' line continuous '. -- this is entire print line.
     3
     4    print ' this is first and next '
     5    ' line continuous and'
     6    'still there now over'. -- this 3lines together a single print line.


Code:
# cat -n file |sed '/this is fir/d'
     2    ' line continuous '. -- this is entire print line.
     3
     5    ' line continuous and'
     6    'still there now over'. -- this 3lines together a single print line.


Btw, in your code:
Code:
print ' this is first'

, entry not there.
pls provide more input.
# 3  
Old 05-30-2013
Hi,

i need to delete entire print lines... Like my file is having some printf statements. I need to remove all the printf lines in my file. These printf statements might be in a single line or it might stretch for 2 lines also( in this case these two lines have to be deleted as these two line together a printf statement). say my file is as follows:


$cat testfile.txt
1. pritnf 'this is first line ' .
2. printf ' this is second line '
'this is continuous line ' .
3. print ' this is 3rd line '
' it is still there '
' now its over ' .
4. set a = b
5. MOVE A TO B

output :
4. set a = b
5. MOVE A TO B

Please let me know how to delete those printf lines using sed in unix.

Thanks in advance..
# 4  
Old 05-30-2013
Please use code tags as required by forum rules!

What OS / shell / system is that? I'd be surprised if you could, in any tool, output 'this is continuous line ' without a print command or a line continuation char in the line before. And, the only solution I could imagine to your problem is to keep a flag for "print command started" and then check for " ' " being the first char in the next line. afaik you can't do that with sed; awk might do.
# 5  
Old 05-31-2013
HI,

the shell is bash shell and the system is windows.

i need to delete entire print lines... Like my file is having some printf statements. I need to remove all the printf lines in my file. These printf statements might be in a single line or it might stretch for 2 lines also( in this case these two lines have to be deleted as these two line together a printf statement). say my file is as follows:

Code:
$cat testfile.txt
1. pritnf 'this is first line ' .
2. printf ' this is second line '
   'this is continuous line ' .
3. print ' this is 3rd line '
  ' it is still there '
 ' now its over ' .
4. set a = b
5. MOVE A TO B

output :
4. set a = b
5. MOVE A TO B

---------- Post updated 05-31-13 at 04:02 AM ---------- Previous update was 05-30-13 at 10:23 PM ----------

And is there any way to use grep in this script to reduce the repetations to the minimum. i mean it should not the repeat the output as a result of grep.

Please help me out Smilie
# 6  
Old 05-31-2013
DUPLICATE THREAD of while loop
 
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