$ uname -a
Linux linux-86if.site 3.1.0-1.2-desktop #1 SMP PREEMPT Thu Nov 3 14:45:45 UTC 2011 (187dde0) x86_64 x86_64 x86_64 GNU/Linux

$ bash --version
GNU bash, version 4.2.10(1)-release (x86_64-suse-linux-gnu) 

$ awk --version
GNU Awk 4.0.0 

$ perl --version
This is perl 5, version 14, subversion 2 (v5.14.2) built for x86_64-linux-thread-multi 

$ ksh ### using ksh now
$ echo ${.sh.version}
Version JM 93t+ 2010-06-21 

$ exit ### back to bash

$ type printf
printf is a shell builtin

$ printf "%.0f\n" 4.5
4

$ printf "%.0f\n" 5.5
6

$ awk 'BEGIN{printf "%.0f\n",4.5}'
4

$ awk 'BEGIN{printf "%.0f\n",5.5}'
6

$ perl -e 'printf "%.0f\n",4.5'
4

$ perl -e 'printf "%.0f\n",5.5'
6

$ ksh ### now to ksh
$ whence -v printf
printf is a shell builtin

$ printf "%.0f\n" 4.5
5

$ printf "%.0f\n" 5.5
6