Shell Programming and Scripting

sed 's/^.* //' input.txt              # Will give you just the last field, so I'm assuming you only have two.
cut -f2- -d" " input.txt              # Will give you all the columns except the first

perl -e 'foreach (<>) {
   @line=split / /;
   shift @line;
   print join (" ",@line)
}' < input.txt                        # Probably a bit long though (and I'm sure someone has a neater way, I'm new to Perl and just practising really)

while read a b
do
   echo "$b"
done < infile

awk '{$1=""}{print}' input.txt

awk '{$1=""; print}' input.txt

sed 's/[[:space:]]*[^[:space:]]\{1,\}[[:space:]]*//1' input.txt

awk 'sub("^" $1 FS, _)' file
x
y
z