Most efficient way to insert a leading and trailing double-quote

bluwulf · #1 (**permalink**) 10-16-05, 02:13

What would be the easiest and most efficiet way to put a leading and trailing double-quote on every line in a file (that has 10 MIL lines)

I kno this works:

Code:

sed "s/^/\"/" my_10MIL_LINE_file.txt | sed "s/$/\"/" > my_10MIL_LINE_file.txt.tmp

But is there a better way of doing this ? I need to do this for several 10 MIL lines file each nite.

test · #2 (**permalink**) 10-19-05, 13:02

This would be better....

sed 's/^/"/;s/$/"/' yourFile > newFile

test · #3 (**permalink**) 10-19-05, 13:03

And if you're in an experimental mood, you could compare timings with...

sed 's/$^.*$$/"\1"/' yourFile > newFile

n_i · #4 (**permalink**) 10-19-05, 15:55

...and with

Code:

awk '{print "\"" $0 "\""}' yourFile > newFile

bluwulf · #5 (**permalink**) 10-19-05, 20:28

Hey thanx for all the suggestions.

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