[ALUG] Bash script error; too many arguments

Why does; if [ "$1" -ge 128 -a -lt 192 ] Error out with 'too many arguments', where have I gone wrong here? Also I have in the mean time settled with; if [ "$1" -ge 128 ] && [ $1 -lt 192 ] Is either one of these preferred over the other? -- Regards, James. http://www.jamesbensley.co.cc/ There are 10 kinds of people in the world; Those who understand Vigesimal, and J others...?