$ cat /proc/version
Linux version 2.6.11.4-21.14-default (geeko@buildhost) (gcc version 3.3.5 20050117 (prerelease) (SUSE Linux)) #1 Thu Aug 24 09:51:41 UTC 2006

$ echo /proc/vers*
/proc/version

$ cat /proc/vers*
Linux version 2.6.11.4-21.14-default (geeko@buildhost) (gcc version 3.3.5 20050117 (prerelease) (SUSE Linux)) #1 Thu Aug 24 09:51:41 UTC 2006

$ uname -a
Linux charm 2.6.11.4-21.14-default #1 Thu Aug 24 09:51:41 UTC 2006 i686 i686 i386 GNU/Linux

$ perl -e '@args=qw(cat /proc/version); system(@args)'
Linux version 2.6.11.4-21.14-default (geeko@buildhost) (gcc version 3.3.5 20050117 (prerelease) (SUSE Linux)) #1 Thu Aug 24 09:51:41 UTC 2006

$ perl -e '@args=qw(cat /proc/vers*); system(@args)'
cat: /proc/vers*: No such file or directory

$ perl -e '@args=qw(uname -a); system(@args)'
Linux charm 2.6.11.4-21.14-default #1 Thu Aug 24 09:51:41 UTC 2006 i686 i686 i386 GNU/Linux

$ perl -e '@args=qw(uname -a;echo do-something-evil); system(@args)'
uname: invalid option -- ;
Try `uname --help' for more information.

$ perl -e 'system q(uname -a;echo do-something-evil)'
Linux charm 2.6.11.4-21.14-default #1 Thu Aug 24 09:51:41 UTC 2006 i686 i686 i386 GNU/Linux
do-something-evil