e2fsck: add page (#4438)

pages/linux/e2fsck.md

@@ -0,0 +1,15 @@
+# e2fsck
+
+> Check a Linux ext2/ext3/ext4 filesystem. The filesystem should be unmounted at the time the command is run.
+
+- Check filesystem, reporting any damaged blocks:
+
+`e2fsck {{/dev/sdXN}}`
+
+- Check filesystem and automatically repair any damaged blocks:
+
+`e2fsck -p {{/dev/sdXN}}`
+
+- Check filesystem in read only mode:
+
+`e2fsck -c {{/dev/sdXN}}`