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remove particular line from a file using sed

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# 1  
Old 08-29-2012
remove particular line from a file using sed
Hi

i need to remove all the lines staring with 'printf("\n' from a file,

example : the file tmp.txt contains

Code:
 
printf("\n ");
printf("\n good");
  printf("\n ");
    printf("\n ");
printf("");
printf(
m_sprintf(for
printf("\n ");

i have tried with following commands but its not working, pls help.

Code:
 
sed '/^* printf/d' t
sed '/^. printf/d' t

# 2  
Old 08-29-2012
Does this meet your requirement?
Code:
sed '/^[[:blank:]]*printf("\\n/d' infile

This User Gave Thanks to elixir_sinari For This Post:
mprakasheee
# 3  
Old 08-29-2012
Code:
sed '/^ *printf/d' t

# 4  
Old 08-29-2012
Quote:
Originally Posted by elixir_sinari
Does this meet your requirement?
Code:
sed '/^[[:blank:]]*printf("\\n/d' infile

this command meet the requirement, could you explain the details of this command.
# 5  
Old 08-29-2012
^ -- beginning of line
[[:blank:]]* -- 0 or more occurrences of the blank character class (which matches a space or a tab).
printf("\\n -- your pattern. The \n has to be given as \\n. Otherwise, the sed regexp parser will "eat" the backslash before n and treat it as a literal n
# 6  
Old 08-29-2012
Quote:
Originally Posted by mprakasheee
this command meet the requirement, could you explain the details of this command.

[:blank:]Space and TAB characters only.[:blank:]* --> match Space or TAB characters
\\n ---> escape the back slash by adding one more \ ( back slash)
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