Shell script to rename a virtual machine in VMware ESXi

rename_vm.sh

#!/bin/sh
# shell script to rename a virtual machine in ESXi

VOLNAME=$1
DIRNAME=$2
OLDNAME=$3
NEWNAME=$4
VM_DIRPATH="/vmfs/volumes/$VOLNAME/$DIRNAME"

f_OK() {
    if [ $? -eq 0 ]; then
        echo "OK"
    fi
}

if [ $# -ne 4 ]; then
    echo "Usage: $0 VOLNAME DIRNAME OLDNAME NEWNAME
where VOLNAME is the volume name, e.g. datastore1,
      DIRNAME is the the name of the directory of the virtual machine,
      OLDNAME is the name of the files of the virtual machine before the '.',
      NEWNAME is the new name for the directory and the files.
"
    exit 1
fi

if [ ! -d $VM_DIRPATH ]; then
    echo "The directory path $VM_DIRPATH is invalid"
    exit 1
fi

## rename the content of the files
for FILE in $(ls $VM_DIRPATH | grep -E "\.vmx[f]?|\.vmdk|\.vmsd|\.xml" | grep -v "\-flat\.vmdk"); do
    echo "changing the contents of the file $FILE"
    eval sed -i 's/$OLDNAME/$NEWNAME/g' $VM_DIRPATH/$FILE
    f_OK
done

## rename the files
for FILENAME in $(ls $VM_DIRPATH | grep $OLDNAME); do
    NEWFILENAME=$(echo $FILENAME | eval sed 's/$OLDNAME/$NEWNAME/')
    echo "renaming the file $FILENAME to $NEWFILENAME"
    mv $VM_DIRPATH/$FILENAME $VM_DIRPATH/$NEWFILENAME
    f_OK
done

## rename the directory
if [ $DIRNAME != $NEWNAME ]; then
    NEWVM_DIRPATH=$(echo $VM_DIRPATH |eval sed 's/$DIRNAME/$NEWNAME/')
    echo "renaming the directory $VM_DIRPATH to $NEWVM_DIRPATH"
    mv $VM_DIRPATH $NEWVM_DIRPATH
    f_OK
fi

Thank you for the script! Quick question, though:

I'm currently trying to execute the following:

rename-vm.sh datastore2 Windows\ Server\ 2012 Wndows\ Server\ 2012 Windows\ Server\ 2012\ R2\ \(SVN\)

I'm getting the following error:

sh: Server: unknown operand
ls: /vmfs/volumes/datastore2/Windows: No such file or directory
ls: Server: No such file or directory
ls: 2012: No such file or directory
grep: Server: No such file or directory
grep: 2012: No such file or directory
ls: /vmfs/volumes/datastore2/Windows: No such file or directory
ls: Server: No such file or directory
ls: 2012: No such file or directory
sh: Server: unknown operand

I'm also not that strong on Linux, so I'm slowly troubleshooting my issue.