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awk one line, change \n to sth in a file

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# 1  
Old 06-08-2010
awk one line, change \n to sth in a file
Hi Everyone,
Code:
cat 1.txt
aaa
bbb
ccc

outout will be
Code:
cat 2.txt
,,aaa,,bbb,ccc,,

means change "\n" to ",,", and add ",," into the beginging and ending.
right now i am using perl while to open and read the file, then split \t, feel not nice. please advice.

and i hear using perl is faster than awk, when doing some replace string in a file, is it?

Thanks
Last edited by jimmy_y; 06-08-2010 at 01:18 PM..
# 2  
Old 06-08-2010
Maybe you're looking for something like this?
Code:
perl -ane '$_ =~ s/^/,,/g if $. == 1; $_ =~ s/\n/,,/g; print' 1.txt > 2.txt

This User Gave Thanks to pseudocoder For This Post:
jimmy_y
# 3  
Old 06-08-2010
Code:
awk 'BEGIN{ORS=",,"}NR==1{$0=",,"$0;print;next}1' infile

This User Gave Thanks to bartus11 For This Post:
jimmy_y
# 4  
Old 06-08-2010
Code:
awk -v ORS=",," 'BEGIN {printf ORS}1' file

This User Gave Thanks to Scott For This Post:
jimmy_y
# 5  
Old 06-08-2010
Thanks everyone, your code is working nice.

Another question, if instead of ",,", if i want to if there is a space, i want to replace it with "" (means none).
for exmaple:

Code:
cat 1.txt
 aaa
bbb 
 ccc

output
Code:
cat 2.txt
,,aaa,,bbb,ccc,,

Thanks
# 6  
Old 06-08-2010
Added gsub statement to scottn code

Code:
awk -v ORS=",," 'BEGIN {printf ORS} {gsub(" ","")} 1' file

This User Gave Thanks to anbu23 For This Post:
jimmy_y
# 7  
Old 06-08-2010
Quote:
Originally Posted by anbu23
Added gsub statement to scottn code

Code:
awk -v ORS=",," 'BEGIN {printf ORS} {gsub(" ","")} 1' file

thanks it works Smilie, just would like to know the "1" means? (1' file), the "1". thanks
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