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There is 3 commands producing output so you would have to redirect 3 times:

echo $H > newfile; sed '1d;$d' infile| sort -t'|' -k1.15,1.17 >> newfile; echo $T >> newfile


You could...

/usr/xpg4/bin/grep -vE "^[:blank:]*$" inputfile remove blank lines
sed 's|^\([0-9]\)|:\1|;s|\([0-9]\)$|\1:|' add ":" at beginning of line starting with a number and at the end of lines ending with...

use strict;
use warnings;

undef $/;
my $file_name="unix.txt";
open (FIN, "$file_name");
my $file=<FIN>;
close (FIN);

$file=~ s{([^,]+,){3}\w+}{&clean_up($&)}ges;

open (FOUT,...

sed 's: *\\n *: :g;s: *, *:,:g' infile
This would also remove space touching coma.

or
sed 's:\\n: :g;s: *: :g' infile
s substitute
: separator
\\n pattern to replace (the \ is used to...