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Neither sort will work if you get more than 9 files unless the single digit numbers have a 0 before their number (01... 09, etc)

(examples)
# touch file{1,2,5,10,15,20}.log
# ls *.log| sort -u |...

Scrutinizer's is better, but tr -d '\n' is often handy to know.
# ping -c 1 google.com | grep 'PING' | cut -d'(' -f2 | cut -d')' -f1 | tr -d '\n'
74.125.65.104#

You're definitely better off learning the long way, but here's a shorty...tee file.a.b.{A,B,C,D}.r < file.a.b.c-d.rOr, same thing but slightly longer and easier to understand:
cat file.a.b.c-d.r |...