Introduction to read and write operation of Perl file

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Basic Icano operation:

Output:

Print "Hello\ n"

Print "Say\" Hello\ "to NG", "\ n"

"", $outfile or dieboxes; # Open the file $outfile

# or: openOUT, "> $outfile" or diebacks!

# append to the file (the contents of the original file are retained):

Open OUT, "> > $outfile" or diebacks!

# output content to file:

Print OUT "Hello, NG\ n"; # enter content Hello NG into the file

# close the handle:

Close OUT; # output end

Use of $/ (current input record delimiter, default is newline character):

Input file test.fasta:

> Scaffold1

AAAAATCTA

GACGA

> Scaffold2

ATCTAAATAT

TTTAAC

Open IN, "; # change the input record delimiter to" > "

Open IN, "; # change the input record delimiter to" > "

; # Skip the content before the first ">"

My $line =

Chomp $line; # delete the ">" at the end

Print ">", $line

Close IN

$/ = "\ n"; # change the input record delimiter to "\ n"

# display

> Scaffold1

AAAAATCTA

GACGA

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