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Wiki source code of Linux User Consoles How-Tos

Last modified by loktevda on 2026-01-19 10:02
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1 {{toc/}}
2
3
4 **Current Operating System: Ubuntu 24.04 LTS **
5
6 This guide provides essential how-to instructions for Ubuntu 24.04 LTS users working with the Linux console FSFL.
7
8 == Access Information ==
9
10 **Need login credentials functional accounts or support?**
11
12 * **Email:** [[darya.loktev@desy.de>>mailto:darya.loktev@desy.de]]
13 * **In-person support:** Come to room 02.015
14
15 == Shared Desktop Environment ==
16
17 The Desktop will be shared -  for functional accounts, /desktop/shared is available for document sharing and collaboration.
18
19 === Desktop Folder: exchange ===
20
21 You can use the folder **/Desktop/exchange** to **exchange files between consoles** and work with them on different systems.
22
23 **Important:**
24 This folder is intended **only for short-term file exchange**.
25 Please **do not store important sensitive or long-term data** there.
26
27 Files in exchange may be **deleted or cleaned up at any time**.
28 \\\\
29
30 == Application Access Changes ==
31
32 **Application access has changed:** Applications are no longer accessed via Desktop icons. Instead, applications are now accessed through **Dashboard pins**.
33 Look for the Dashboard left (Activities overview) to find and launch your applications.
34 [[image:Screenshot from 2025-05-06 13-10-38.png||height="368" width="600"]]
35
36 == Paths of the mounts ==
37
38 Since the path's are not in the fstab anymore, one have to know the paths which are:
39
40 FLASH Core-FS:
41
42 **/asap3/flash/gpfs**
43
44 FLASH-O Core-FS:
45
46 **/asap3/fs-flash-o/gpfs**
47
48 pnfs:
49
50 **/pnfs/desy.de/flash1**
51
52
53 == How to take screenshots ==
54
55 Ubuntu 24 provides several convenient keyboard shortcuts for capturing screenshots:
56
57 === Keyboard Shortcuts ===
58
59 {{{
60 }}}
61
62 |=Shortcut|=Action
63 |FN +PrtScn|Capture entire desktop
64 |Alt + PrtScn|Capture active window only
65 |Shift + PrtScn|Capture selected area
66 |Ctrl + PrtScn|Copy screenshot to clipboard
67
68 === How to Use Area Selection ===
69
70 1. Press Shift + PrtScn
71 1. Your cursor changes to a crosshair
72 1. Click and drag to select the area you want to capture
73 1. Release to take the screenshot
74
75 [[image:attach:Screenshot from 2020-01-22 10-16-28.png||height="250"]]
76
77 Easy to take screenshots of the full Desktop, only the active window or just an area. In area mode your cursor turns into a crosshair and you have to mark the area you want to take a screen of.
78
79 In the above picture i used alt+print, for the following i used shift+print, so you see its just an area:
80
81 [[image:attach:Screenshot from 2020-01-22 10-16-02.png||height="250"]]
82
83
84 == How to change colors in terminal ==
85
86 In the Terminal click on "Edit" → "Preferences". A new window opens and there you click on the tab "Profiles". After this click on "Edit" to change the used profile:
87
88 [[image:attach:Screenshot from 2020-01-22 10-18-49.png||height="250"]]
89
90 In the tab "Colors" you can change the colors from system themed to your own favorite:
91
92 [[image:attach:Screenshot from 2020-01-22 10-19-13.png||height="250"]]
93
94 In my case on my computer i use green text and black background with a much more colored stuff [[image:http://confluence.desy.de/s/en_US/7901/4635873c8e185dc5df37b4e2487dfbef570b5e2c/_/images/icons/emoticons/smile.svg||border="0" title="(smile)" class="emoticon emoticon-smile"]]
95
96 [[image:attach:Screenshot from 2020-01-24 09-06-40.png||height="112"]]
97
98 (One can edit some coloring-the-terminal stuff in the .bashrc, too! But this isn't the topic in here [[image:http://confluence.desy.de/s/en_US/7901/4635873c8e185dc5df37b4e2487dfbef570b5e2c/_/images/icons/emoticons/smile.svg||border="0" title="(smile)" class="emoticon emoticon-smile"]])
99
100
101 == How to run the Shell as a login shell ==
102
103 In the editing Profile Windows (see picture above) click on the Tab "Command" and check the "Run command as a login shell":
104
105 [[image:attach:Screenshot from 2020-01-22 10-19-44.png||height="250"]]
106
107 To see if you are running with or without login you can use the command "echo $0":
108
109 [[image:attach:Screenshot from 2020-01-22 10-20-29.png]]
110
111 The "-" implicates that it is a login shell. At example you need the login shell to use all your own variables. If you just change user etc. without it, it may happen that - at example - you don't have permissions to geht dconf work because of some variables still got owned by the previous user.
112
113
114 == Additional Tips ==
115
116 ==== Terminal Best Practices ====
117
118 * Use Ctrl + C to cancel running commands
119 * Use Ctrl + Z to suspend processes (resume with fg)
120 * Use history to view command history
121 * Use Tab for auto-completion
122
123 ==== File System Navigation ====
124
125 * Use pwd to show current directory
126 * Use ls -la for detailed file listings
127 * Use cd - to return to previous directory
128
129 ==== Getting Help ====
130
131 * Use man <command> for manual pages
132 * Use <command> ~-~-help for quick help
133 * Use apropos <keyword> to find related commands
134
135 ==== JDDD Issues ====
136
137 * (((
138 When starting the application, please check whether another instance is already running so that it does not open multiple windows or panels at the same time, which could cause an Out-Of-Memory error.
139 If another instance is running, the new one should either close the existing instance safely or terminate the Java process **killall jddd **or via Task Manager.
140 To open the Task Manager, press **Ctrl + Shift + Esc**.
141 Alternatively, you can press **Ctrl + Alt + Delete** and select **Task Manager** from the menu or search in Apps.
142 From there, you can find the running Java process and end it if necessary.
143
144 **In case the Gnome graphic user interface is frozen, restart the X server by pressing the following 4 keys simultaneously: Ctr, Alt, SysReq, K. or Wndows taskbar**
145
146
147 The logbook printers for jddd are controlled via ab environment variable. So if you start jddd from the Terminal using the following command:
148 \\ LOGBOOKS="flash2_hhgelog:$LOGBOOKS" flash the logbook should appear in jddd.
149 )))