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--- lwc:programming:bash [2024/09/09 10:15] – [PDF] John Harrison
+++ lwc:programming:bash [2025/11/09 20:00] (current) – John Harrison
@@ Line 181: / Line 181: @@
 <code>sudo lsof -i:8078</code>
+==== Superuser ====
+=== Execute sudo cmd without needing to type password ===
+== Staying Safe ==
+  - backup ''/etc/sudoers'' file i.e. copy to somewhere safe
+  - leave at least one terminal window open as root
+  - edit ''/etc/sudoers'' with ''visudo'' not ''sudo''. It's a wrapper for your already configured editor (not necessarily vi)
+== The Magic ==
+  * create a wrapper script that does all your magic for you. Don't add sudo to the cmds in the wrapper script
+  * using ''visudo'' add to the end of your ''/etc/sudoers'' file ''USERNAME ALL=(ALL:ALL) NOPASSWD: FULL_PATH_TO_SCRIPT'' substituting in USERNAME and FULL_PATH_TO_SCRIPT as necessary
+  * to execute the cmd without password type ''sudo FULL_PATH_TO_THE_SCRIPT''
 ===== Misc =====
    * write to dmesg: ''echo Some message > /dev/kmsg''
@@ Line 190: / Line 199: @@
    * traverse through to see what is using disk space: ''du -cha --max-depth=1 /var | grep -E "M|G"''
    * find out what app is on a particular port: ''netstat -anpe | grep "1234" | grep "LISTEN"''
+   * if ''mount -o loop ./live-cd.iso /mnt'' returns ''mount: /mnt: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.'' then
+     * ''sudo kpartx -av live-cd.iso'' and (example) ''sudo mount -o loop /dev/mapper/loop0p1 /mnt''