Question

I am trying to do an algorithm that recognize numbers on a String and put that numbers on a variable.
For example “abc 123” save 123 on a variable.
Thanks.

Answer 1

since a string could have more number segments, so I would go with sed:

sed 's/[^0-9]//g'

kent$  echo "foo 0 abc 123 foo 456"|sed 's/[^0-9]//g' 
0123456

I hope this is what you want.

oh, forgot the “saving to variable” part:

kent$  number=$(echo "foo 0 abc 123 foo 456"|sed 's/[^0-9]//g')


kent$  echo $number
0123456