Shell Programming and Scripting

wait time=1
current time=$(date +'%H%M')
max-time 5
 
run time =0
while:
do
cd mydir
if [[current time < '900']]
then if [-e filename.txt]
then mv folder1  folder2
exit 0;
fi
else
exit 0;
fi
 
if [run time -ge max time] then echo "time out"
exit 0;
fi
 
sleep 60
run time=run time + wait time
done

current_time=$(date +'%H%M')
typeset -i max_time=5
typeset -i run_time=0
typeset -i wait_time=1

while : ; do
     current_time=$(date +'%H%M')
     if [ $current time -gt 900 ] ; then
          if [ -e "/mydir/filename.txt" ] ; then
               mv /mydir/folder1 /mydir/folder2
               exit 0
          fi
     else
          exit 0
     fi
 
     if [ $run_time -ge $max_time ] ; then
          echo "time out"
          exit 0
     fi
 
     sleep 60
     (( run_time += wait_time ))
done

current_time=$(date +'%H%M') [to get current time]
max_time=5 {used for how long the file would be watched with loop]
wait_time=1 (to add to runtime}

run_time=0
while :  
do
     if [ $current time < '900' ] ; then
          if [ -e "/mydir/filename.txt" ] ; then
               mv /mydir/folder1 /mydir/folder2
               exit 0
          fi
     else
          exit 0
     fi
 
     if [ $run_time -ge $max_time ] ; then
          echo "time out"
          exit 0
     fi
 
     sleep 60
     (( $run_time = $run_time+$wait_time ))
done

current_time=$(date +'%H%M')

if [ $run_time -ge $max_time ] ; then