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Shell Programming and Scripting

replacing multiple lines with single line

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# 1  
Old 05-27-2008
replacing multiple lines with single line
Can any one give me the idea on replacing multiple blank lines with a single blank line?

Please conside it for a file having more than 100 number of characters.

Regards,
Siba
# 2  
Old 05-27-2008
If you have that option with cat:
Code:
cat -s

With sed:
Code:
sed '/./,/^$/!d'

# 3  
Old 05-28-2008
In my machine cat -s do nothing. The output is same as simply cat.

Te second one is doing fine in linux machine but not in HP-UX (When the no of characters in the line is more, say 1000 ).




Quote:
Originally Posted by ripat
If you have that option with cat:
Code:
cat -s

With sed:
Code:
sed '/./,/^$/!d'

# 4  
Old 05-28-2008
I don't have a HP-UX box to test but try any of the following:
Code:
 # delete all CONSECUTIVE blank lines from file except the first; also
 # deletes all blank lines from top and end of file (emulates "cat -s")
 sed '/./,/^$/!d'          # method 1, allows 0 blanks at top, 1 at EOF
 sed '/^$/N;/\n$/D'        # method 2, allows 1 blank at top, 0 at EOF

 # delete all CONSECUTIVE blank lines from file except the first 2:
 sed '/^$/N;/\n$/N;//D'

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