Example1:
perl -e 'while(<>) {if($_=~/^>/) {print $_;} else {$_=~tr/ATCG/TAGC/;
+print $_;}}' FILE
Use -n to replace the while loop:
perl -nle 'if($_=~/^>/) {print $_;} else {$_=~tr/ATCG/TAGC/; print $_;
+}' FILE
Do away with the unnecessary explicit references to $_:
perl -nle 'if(/^>/) {print;} else { tr/ATCG/TAGC/; print; }' FILE
Recognise that every line is being printed, so -p can replace the explicit print statements:
perl -ple 'if(/^>/) { ; } else { tr/ATCG/TAGC/; }' FILE
Rearrange to do away with the empty if body:
perl -ple 'tr/ATCG/TAGC/ unless( /^>/ );' FILE
UPDATE: a final step:
perl -ple '/^>/ or tr/ATCG/TAGC/' FILE
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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