--- a/sbin/fjail	Sun Aug 21 11:43:01 2022 +0200
+++ b/sbin/fjail	Sun Aug 21 12:08:59 2022 +0200
@@ -135,7 +135,7 @@
     # parent ZFS dataset -- child ZFS dataset name
     local _pds _cds
     # and its mount point
-    local _pmp _get _dummy
+    local _pmp _get
     # full name of the dataset
     local _ds
     # dynamic ZFS options  -- create cache for freebsd-update  -- use a more tiny layout
@@ -174,10 +174,7 @@
         echo "ERROR: no parent dataset given" >&2
         return 2
     fi
-    _get=$(zfs get -H mountpoint "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; }
-    IFS=$'\t' read _dummy _dummy _pmp _dummy <<EOF
-${_get}
-EOF
+    _pmp=$(zfs list -H -o mountpoint "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; }
     case "${_pmp}" in
         none)
             echo "ERROR: dataset \`${_pds}' has no mountpoint" >&2
@@ -198,7 +195,7 @@
     fi
     _ds="${_pds}/${_cds}"
     echo "Resulting new root dataset is \`${_ds}' at mountpoint \`${_pmp}/${_cds}'"
-    if zfs get -H mountpoint "${_ds}" >/dev/null 2>/dev/null; then
+    if zfs list -H -o mountpoint "${_ds}" >/dev/null 2>/dev/null; then
         echo "ERROR: dataset \`${_ds}' does already exist" >&2
         return 1
     fi
@@ -499,10 +496,7 @@
     _vestatus=""
     _veds="$(_get_dataset_for_varempty "${_mp}")"
     if [ $? -eq 0 ]; then
-        _get=$(zfs get -H readonly ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; }
-        IFS=$'\t' read _dummy _dummy _vestatus _dummy <<EOF
-${_get}
-EOF
+        _vestatus=$(zfs list -H -o readonly ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; }
         if [ "${_vestatus}" = "on" ]; then
             zfs set readonly=off ${_veds} 1> /dev/null || { echo "ERROR: cannot reset readonly-status of ${_mp}/var/empty" >&2; return 1; }
         fi