while loop

1. create a function to generate file with the filename start with 10 random characters

#!/bin/bash
WORK_DIR=/tmp/00
#define the function
create(){
    i=1
    while [ $i -le 5 ]
    do
       if [ ! -d $WORK_DIR ]
       then
          mkdir -p $WORK_DIR
          cd $WORK_DIR && touch `</dev/urandom tr -dc "a-z" | head -c 10`_test.txt
       else

          cd $WORK_DIR && touch `</dev/urandom tr -dc "a-z" | head -c 10`_test.txt
       fi

       i=$(( $i+1 )) 
     done
}
# invoke the function   
create