mjhjmtu

B=$1
CHECK="$(ssh $USER@$LOGINHOST <<EOD
 . /path/loadprofile.sh
 if [[ ! -e $TXTDR/$B.txt ]]; then; echo "TXT file for this job does not exist."; exit; fi
 mv $TXTDR/$B.txt /tmp/$B
EOD)"

It is failing with exit code 1 and does not display any error message but the file that i am trying to move just vanishes. So i have two questions here.

1. Why is it failing? When I am trying same from command line, it
   
   works.


2. If it fails, why does the file that i am trying to move
   
   vanish? Is that how mv generally works?

NOTE: The script is running in bash shell and the default remote server shell is ksh.

The here-document delimiter, EOD, that is ending the document, must be on a line by itself. The EOD) string is not equal to EOD.

mv does not remove files on failures. Assuming $B does not contain whitespace characters and if the TXTDR variable is undefined by the remote shell, the command executed would be

mv /$B.txt /tmp/$B

(with $B expanded by the local shell before ssh is called), but that will definitely not delete /$B.txt if the target is not writable.

If $B contains whitespace characters, it needs to be double quoted (just like $TXTDR should be):

mv "$TXTDR/$B.txt" "/tmp/$B"

For doing the particular thing that you are using this code snippet for, I would probably have written it as

ssh "$user@$server" sh -s -- "$somepath/file.txt" <<'END_SCRIPT'
[ -e "$1" ] && mv "$1" "/new/location/$1##*/"'
END_SCRIPT

or even just

ssh "$user@$server" sh -s -- "$somepath/file.txt" "/new/location/file.txt" <<'END_SCRIPT'
mv "$1" "$2"
END_SCRIPT

(which arguably does not need a here-document at all and could be shortened to ssh "$user@$server" mv "..." "...")

... without outputting unnecessary text. If you want to test for success, look at $? after this (would be zero if everything went ok).

This would also work:

if ! ssh "$user@$server" mv "..." "..."; then
 echo 'Something went wrong with ssh or remote mv' >&2
fi