When you need to add multiple similar records to a configuration file (IP addresses for example), you may use vi editor to do it directly:
:r! for i in $(seq 1 5); do echo "This is line \#${i}"; done
This command wil generate 5 lines:
This is line #1 This is line #2 This is line #3 This is line #4 This is line #5
Similar command used to generate Reverse DNS entries in BIND:
:r! for i in $(seq 1 5); do echo "$i PTR host${i}.domain.com"; done
1 PTR host1.domain.com 2 PTR host2.domain.com 3 PTR host3.domain.com 4 PTR host4.domain.com 5 PTR host5.domain.com
Line numbers can be changed, modifyng the $(seq 1 5); part.
