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"Thank you, Ken. It works very well."

You're welcome.

"Would you help me identify the problem in my script."

Happy to.

"I moved the print after unless block but it still does not work."

Unfortunately, that doesn't help me to help you. What exactly did you move? Where precisely did you move it to? What does "it still does not work" mean?

You need to provide code along with expected results, actual results, and any error or warnings messages. This is all described in more detail in the "How do I post a question effectively?" guidelines.

Here's what choroba was referring to:

$ perl -Mstrict -Mwarnings -e ' my @fasta = (">dddd\n", "abcdef\n", ">eeee\n", "bcdef\n"); for (@fasta) { unless (/^>/) { s/^/ACGAGTGCGT/; } print; } ' >dddd ACGAGTGCGTabcdef >eeee ACGAGTGCGTbcdef

That may give you your answer. If not, post the requested information so that we can provide genuine help as opposed to guesswork.

-- Ken

In reply to Re^3: add letters to the begin of the sentence by kcott
in thread add letters to the begin of the sentence by intect

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