#!/bin/shfoo=10while [ $foo -lt 100 ]; do  cat >>dhcp-1.leases <<~lease 10.0.0.$foo {  starts 4 2001/05/01 02:19:16;  ends 5 2021/05/03 02:29:16;  binding state active;  next binding state free;  hardware ethernet 08:00:46:06:6c:23;  uid "test-$foo";}~  foo=`expr $foo + 1`  cat >>dhcp-2.leases <<~lease 10.0.0.$foo {  starts 4 2001/04/19 02:19:16;  ends 5 2021/04/21 02:29:16;  binding state active;  next binding state free;  hardware ethernet 08:00:46:06:6c:23;  uid "test-$foo";}~  foo=`expr $foo + 1`done