BOOT_DIR=/usr/boot/
# get the server we are going to be contacting
-BOOT_SERVER=`cat $BOOT_DIR/boot_server`
-BOOT_SERVER_PORT=`cat $BOOT_DIR/boot_server_port`
+BOOT_SERVER=$(cat $BOOT_DIR/boot_server)
+BOOT_SERVER_PORT=$(cat $BOOT_DIR/boot_server_port)
# the file to request from the boot server
-BOOT_SERVER_PATH=`cat $BOOT_DIR/boot_server_path`
+BOOT_SERVER_PATH=$(cat $BOOT_DIR/boot_server_path)
# location of the cacert for this boot server
BOOT_SERVER_CACERT=$BOOT_DIR/cacert.pem
BOOT_SERVER_GPG_KEYRING=$BOOT_DIR/pubring.gpg
# get the backup server we are going to be contacting
-BACKUP_BOOT_SERVER=`cat $BOOT_DIR/backup/boot_server`
-BACKUP_BOOT_SERVER_PORT=`cat $BOOT_DIR/backup/boot_server_port`
+BACKUP_BOOT_SERVER=$(cat $BOOT_DIR/backup/boot_server)
+BACKUP_BOOT_SERVER_PORT=$(cat $BOOT_DIR/backup/boot_server_port)
# the file to request from the backup boot server
-BACKUP_BOOT_SERVER_PATH=`cat $BOOT_DIR/backup/boot_server_path`
+BACKUP_BOOT_SERVER_PATH=$(cat $BOOT_DIR/backup/boot_server_path)
# location of the cacert for the backup boot server
BACKUP_BOOT_SERVER_CACERT=$BOOT_DIR/backup/cacert.pem