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    <p>So, I went through and tested/timed some of the answers that were given by other people, plus a python answer of my own. Here is what I got:</p> <p><strong>tr:</strong></p> <pre><code>&gt; time tr "\n" "," &lt; lines &gt; line real 0m1.617s user 0m0.100s sys 0m1.520s </code></pre> <p><strong>python:</strong></p> <pre><code>&gt; time python -c 'import sys; print sys.stdin.read().replace("\n",", "),' &lt; lines &gt; line real 0m1.663s user 0m0.060s sys 0m1.610s </code></pre> <p><strong>awk:</strong></p> <pre><code>&gt; time awk '{printf("%s, ", $0)}' lines &gt; line real 0m1.998s user 0m0.390s sys 0m1.600s </code></pre> <p><strong>perl:</strong></p> <pre><code>&gt; time perl -e 'while (&lt;&gt;) { chomp; print "$_, " }' lines &gt; line real 0m2.100s user 0m0.590s sys 0m1.510s </code></pre> <p><strong>sed:</strong></p> <pre><code>&gt; time sed 's/$/, /g' lines &gt; line real 0m6.673s user 0m5.050s sys 0m1.630s </code></pre> <p>Here is the file I used:</p> <pre><code>&gt; ls -lh lines -rw-r--r-- 1 some one 101M 2010-03-04 19:54 lines &gt; wc -l &lt; lines 1300000 &gt; head -n 3 &lt; lines The pretty pink puma pounced on the unsuspecting aardvark, the scientist watched. The pretty pink puma pounced on the unsuspecting aardvark, the scientist watched. The pretty pink puma pounced on the unsuspecting aardvark, the scientist watched. &gt; head -n 1 &lt; lines | wc -c 82 </code></pre> <p>Originally the timings were taken in cygwin, they have now been taken with fully updated ubuntu 9.10. Also, the text files size was increased to 100 megs, with lines 80ish characters wide. As you can see pretty much anything other than sed is a good idea.</p>
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    1. POHow to replace line-endings in VIM
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    1. COi am very suspicious of your awk results. time you commands a few times, not just once. Python should not be faster than awk, considering it takes time to import modules and stuff
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    2. COIt got ran a few times, that was about average. Just ran it about 10 more times, 1.7xx each time. Maybe it would be different if I wasn't using cygwin awk.
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    3. CO@ghostdog74 You were right to suspect my awk results, I re-ran it on a real linux box, and it was much faster.
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