Shell Programming and Scripting

#!/bin/ksh

while true  #continuous loop (always true)
do
  if [ -f /home/username/Desktop/A.txt ]  # if file exists
  then  #execute these commands/script
    /execute_this_script.ksh  
  else  # file didn't exist, check back in 60 seconds
    sleep 60
  fi
done

#!/bin/ksh

until [ -f /home/username/Desktop/A.txt ]
do
  echo "file is not here yet"
  sleep 60
done

echo "it's here now"
execute_something.ksh

#!/bin/bash

# check to see if foo.txt exists in a particular user's desktop

checkpath="/home/username/desktop/foo.txt"

if [[ -e $checkpath ]]

   then echo "$checkpath already exists"
 
   else touch $checkpath
fi

sleep 5

/path/to/myscript.sh # make sure the script is executable
done