Renamed script, and made what is being deleted conditional and based on user input for piped 'grep' command

zfs/destroy-apt-snapshots.sh

@@ -1,4 +0,0 @@
-#!/bin/bash
-set -euo pipefail
-
-zfs list -t snapshot | grep 'apt-' | sed 's| .*$||g' | head -n -5 | xargs -d '\n' -I {} sudo zfs destroy {}

zfs/zfs-selective-destroy.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -euo pipefail
+
+zfs-clean () {
+    if [ -z "$1" ]; then
+        exit 1
+    elif [ "$1" == "upgrades" ]; then
+        if [ -z "$2" ]; then
+            zfs list -t snapshot | grep 'apt-' | sed 's| .*$||g' | head -n -5 | xargs -d '\n' -I {} sudo zfs destroy {}
+        else
+            zfs list -t snapshot | grep "${2}" | sed 's| .*$||g' | head -n -5 | xargs -d '\n' -I {} sudo zfs destroy {}
+        fi
+    fi
+}