comment on

awk '{s += $0} END {print s}'

Also

(echo 0;sed s,$,+, inputfile;echo p)|dc
[download]

or even (with gnu sed)

sed '

G
s/^ *\([0-9]*\) *\n\([0-9]*\)$/0\1pm0\2nb0/;td;d;
:d;s/n\(\(b\).*0\|\)[^0]*$/nb98765432109876543210a0123456789\2/;
s/\(.\)\(p.*\)\(.\)\(n.*\1\).*a.*\3/\2\4\3/;
s/^0*\(.*\)p\(.*m\)0*\(.*\)\(.\).\{11\}$/0\1p\4\20\3/;
/m0*n.*0/!bd;
s/^\(.*\)p\(.*\)m.*/\1\2/;s/^0*//;
h;$!d

' inputfile
[download]

but the point of the OP was to improve his Perl skills.

Update 2007 dec 6: see also Re: Golf: Adding up array elements

In reply to Re^2: --- adding a column of integers by ambrus
in thread adding a column of integers by Anonymous Monk

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