[] Shell script named filter === randomName.sh

Random roll call reads the file name from the name.txt

[root @ VM_0_10_centos shellscript] # CAT randowName.sh 
# ! / bin / bash 
# random roll call is 
# need to prepare in advance name.txt file, which is written the name, each line a 
the while :
 do 
    Line = `name.txt CAT | WC - l` 
    NUM = $ [the RANDOM Line% + . 1 ] 
    Sed -n " $ {P NUM} " name.txt 
    SLEEP 0.2 
    Clear 
DONE