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Wiki source code of Linux User Consoles How-Tos

Last modified by loktevda on 2025-12-09 15:46
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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** - please use Desktop shared folders for file storage and collaboration.
18
19
20 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
21
22
23
24 == Application Access Changes ==
25
26 **Application access has changed:** Applications are no longer accessed via Desktop icons. Instead, applications are now accessed through **Dashboard pins**.
27 Look for the Dashboard left (Activities overview) to find and launch your applications.
28 [[image:Screenshot from 2025-05-06 13-10-38.png||height="368" width="600"]]
29
30 == Paths of the mounts ==
31
32 Since the path's are not in the fstab anymore, one have to know the paths which are:
33
34 FLASH Core-FS:
35
36 **/asap3/flash/gpfs**
37
38 FLASH-O Core-FS:
39
40 **/asap3/fs-flash-o/gpfs**
41
42 pnfs:
43
44 **/pnfs/desy.de/flash1**
45
46
47 == How to take screenshots ==
48
49 Ubuntu 24 provides several convenient keyboard shortcuts for capturing screenshots:
50
51 === Keyboard Shortcuts ===
52
53 {{{
54 }}}
55
56 |=Shortcut|=Action
57 |FN +PrtScn|Capture entire desktop
58 |Alt + PrtScn|Capture active window only
59 |Shift + PrtScn|Capture selected area
60 |Ctrl + PrtScn|Copy screenshot to clipboard
61
62 === How to Use Area Selection ===
63
64 1. Press Shift + PrtScn
65 1. Your cursor changes to a crosshair
66 1. Click and drag to select the area you want to capture
67 1. Release to take the screenshot
68
69 [[image:attach:Screenshot from 2020-01-22 10-16-28.png||height="250"]]
70
71 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.
72
73 In the above picture i used alt+print, for the following i used shift+print, so you see its just an area:
74
75 [[image:attach:Screenshot from 2020-01-22 10-16-02.png||height="250"]]
76
77
78 == How to change colors in terminal ==
79
80 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:
81
82 [[image:attach:Screenshot from 2020-01-22 10-18-49.png||height="250"]]
83
84 In the tab "Colors" you can change the colors from system themed to your own favorite:
85
86 [[image:attach:Screenshot from 2020-01-22 10-19-13.png||height="250"]]
87
88 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"]]
89
90 [[image:attach:Screenshot from 2020-01-24 09-06-40.png||height="112"]]
91
92 (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"]])
93
94
95 == How to run the Shell as a login shell ==
96
97 In the editing Profile Windows (see picture above) click on the Tab "Command" and check the "Run command as a login shell":
98
99 [[image:attach:Screenshot from 2020-01-22 10-19-44.png||height="250"]]
100
101 To see if you are running with or without login you can use the command "echo $0":
102
103 [[image:attach:Screenshot from 2020-01-22 10-20-29.png]]
104
105 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.
106
107
108 == Additional Tips ==
109
110 ==== Terminal Best Practices ====
111
112 * Use Ctrl + C to cancel running commands
113 * Use Ctrl + Z to suspend processes (resume with fg)
114 * Use history to view command history
115 * Use Tab for auto-completion
116
117 ==== File System Navigation ====
118
119 * Use pwd to show current directory
120 * Use ls -la for detailed file listings
121 * Use cd - to return to previous directory
122
123 ==== Getting Help ====
124
125 * Use man <command> for manual pages
126 * Use <command> ~-~-help for quick help
127 * Use apropos <keyword> to find related commands
128
129 ==== JDDD Issues ====
130
131 * (((
132 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.
133 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.
134 To open the Task Manager, press **Ctrl + Shift + Esc**.
135 Alternatively, you can press **Ctrl + Alt + Delete** and select **Task Manager** from the menu or search in Apps.
136 From there, you can find the running Java process and end it if necessary.
137 )))