cut and awk for same job : extract fields and join them

$ cat test.txt

a:b:c:d:e

a1:b1:c1:d1:e1

Welcome@computer_1012 ~

$ cat test.txt | cut -d: -f1,5 --output-delimiter="-"

a-e

a1-e1

Welcome@computer_1012 ~

$ cat test.txt | awk -F: '{print $1 "-" $5}'

a-e

a1-e1