Shell Programming and Scripting

#!/bin/ksh

while :
do
        if [[ $( ssh -n ${user}@${host} "ls filename 2> /dev/null " | wc -l ) -ne 0 ]]
        then
                echo "File found."
                break;
        else
                echo "File not found."
                sleep 10
        fi
done

./test_new.sh: line 4: ls /home/sendhabh/trial.done  2> /dev/null : No such file or directory
File not found.
-sh-3.2$ ls /home/sendhabh/trial.done
/home/sendhabh/trial.done
-sh-3.2$ wc -l ls /home/sendhabh/trial.done
wc: ls: No such file or directory
1 /home/sendhabh/trial.done
1 total

-sh-3.2$ more test_new.sh
 #!/bin/ksh
while :
do
        if [[ $( "ls /home/sendhabh/trial.done  2> /dev/null " | wc -l ) -ne 0 ]]
        then
                echo "File found."
                break;
        else
                echo "File not found."
                sleep 10
        fi
done

if [ -f /home/sendhabh/trial.done ]; then

-sh-3.2$ ./test_new.sh
File found.
-sh-3.2$ more test_new.sh
 #!/bin/bash
while :
do
        if [[ -f /home/sendhabh/trial.done ]]
        then
                echo "File found."
                break;
        else
                echo "File not found."
                sleep 10
        fi
done

-sh-3.2$ ./test_GMI_final.sh
ssh: : Name or service not known
File not found.

-sh-3.2$ more test_GMI_final.sh
#!/bin/ksh
DATEPREV=`date --date yesterday "+%d%m%Y"`
while :
do
        if [[ $( ssh -n etdmis@$xldn2218pap "ls /sbclocal/InternalSecureFileTransfer/users/ETDIT/gmi_coma/gmi_to_coma/US2COMA_
$DATEPREV.done
 2> /dev/null " | wc -l ) -ne 0 ]]
        then
                echo "File found."
                break;
        else
                echo "File not found."
                sleep 10
        fi
done

#!/bin/bash
DATEPREV=`date --date yesterday "+%d%m%Y"`
ssh xldn2218pap << MSH
while :
do
if [ -f /sbclocal/InternalSecureFileTransfer/users/ETDIT/gmi_coma/gmi_to_coma/US2COMA_$DATEPREV.done ] ;
then
 echo "File found."
 break;
else
               echo "File not found."
                sleep 300
        fi
done
MSH