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Removing blank lines from comma seperated and space seperated file.

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# 8  
Old 05-08-2009
Quote:
Originally Posted by vgersh99
Code:
nawk -F'[, ]' '{a=$0; gsub(FS, "",a); if (length(a)) print }' myFile


Thanks vgersh99

I tried to understand this.
1) You are making comma or space as field seperator
2 could not understand
Code:
gsub(FS, "",a);

3) if length of $0 is greater than 0 print $0

Can you please explain
Code:
gsub(FS, "",a);

this part.

Thanks in advance!!
# 9  
Old 05-08-2009
Quote:
Originally Posted by zenith
Thanks vgersh99

I tried to understand this.
1) You are making comma or space as field seperator
2 could not understand
Code:
gsub(FS, "",a);

3) if length of $0 is greater than 0 print $0

Can you please explain
Code:
gsub(FS, "",a);

this part.

Thanks in advance!!
'man nawk' yields:
Code:
     gsub(ere,repl[,in])
           Behave like sub  (see  below),  except  that  it  will
           replace  all  occurrences  of  the  regular expression
           (like the ed utility global substitute) in  $0  or  in
           the in argument, when specified.

# 10  
Old 05-08-2009
Quote:
Originally Posted by vgersh99
'man nawk' yields:
Code:
     gsub(ere,repl[,in])
           Behave like sub  (see  below),  except  that  it  will
           replace  all  occurrences  of  the  regular expression
           (like the ed utility global substitute) in  $0  or  in
           the in argument, when specified.


I know gsub.
but i did not understood the logic.
Code:
gsub(FS, "",a);

here you are replacing comma or a space with space right ?

Then when i try this
Code:
gsub(FS," ",a);[/

It doesnt work.
Help me understand this.
# 11  
Old 05-08-2009
Quote:
Originally Posted by zenith
I know gsub.
but i did not understood the logic.
Code:
gsub(FS, "",a);

here you are replacing comma or a space with space right ?

Then when i try this
Code:
gsub(FS," ",a);[/

It doesnt work.
Help me understand this.

It is replacing the FS with nothing so that you can count the length of the recrd. Lets say you had
,,, and after replacing , with nothing, you will have nothing, so the length of the record will be zero. so it will not print the record.
if you had ,,ab,, , after replacing , with nothing, you still have ab, so the length will be 2. so it will print the record
# 12  
Old 05-08-2009
Quote:
Originally Posted by devtakh
It is replacing the FS with nothing so that you can count the length of the recrd. Lets say you had
,,, and after replacing , with nothing, you will have nothing, so the length of the record will be zero. so it will not print the record.
if you had ,,ab,, , after replacing , with nothing, you still have ab, so the length will be 2. so it will print the record

Thank you devtakh.
It makes a day better when i learn something.
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