hash: add page (#15229)

pages/common/hash.md

@@ -0,0 +1,20 @@
+# hash
+
+> View cached executable locations.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-hash>.
+
+- View cached command locations for the current shell:
+
+`hash`
+
+- Clear the hash table:
+
+`hash -r`
+
+- Delete a specific command from the hash table:
+
+`hash -d {{command}}`
+
+- Print the full path of `command`:
+
+`hash -t {{command}}`