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--- os_cp:users_permissions [2026/03/17 13:11] – jkonczak
+++ os_cp:users_permissions [2026/03/18 20:56] (current) – [Changing permissions, group and owner of a file] jkonczak
@@ Line 334: / Line 334: @@
 The ''chmod'', <small> ''chgrp'' and ''chown'' </small> commands accept switches ''-R'' (''--recursive'') and ''--reference=//file//'' (to clone the permission/<small>group/owner</small> from the referenced file).
 //Do the exercises on the SSH server indicated during classes (''ssh user//N//@fe80::1%br0'').
 \\ To create files, you may use e.g., the // ''fortune > //file//'' //command.//
+<small>
+++++ Instructions for using your own Linux box to do the exercises |
+To do the exercises on your own computer, you may either:
+  - Use the following commands to add sample groups and users to your system:<code bash>
+groupadd even
+groupadd odd
+groupadd low
+groupadd high
+useradd -g odd  -G low  -m user1
+useradd -g even -G low  -m user2
+useradd -g odd  -G high -m user3
+useradd -g even -G high -m user4
+passwd -d user1
+passwd -d user2
+passwd -d user3
+passwd -d user4</code>
+  - Build & use {{so:users_chmod:container-for-file-permission-labs.tar.xz|a docker image}} (provided you're familiar with docker), e.g., using the commands:<code bash>
+curl -s https://www.cs.put.poznan.pl/jkonczak/_media/so:users_chmod:container-for-file-permission-labs.tar.xz | tar xJ
+docker build --tag container-for-file-permission-labs container-for-file-permission-labs
+docker run --network=none --rm -ti container-for-file-permission-labs</code>
+++++
+</small>
 ~~Exercise.#~~ Create a file. Set the file permissions so that only the user can read the file.