Last modified by Yunhao Wu on 2023/07/05 16:11
From version 1.1
edited by wikibot
on 2023/02/05 20:31
Change comment: Imported from foswiki
To version 2.1
edited by Yunhao Wu
on 2023/07/05 16:11
Change comment: Renamed from xwiki:Informatik.Helpdesk.ProgrammeBeimLogoutNichtBeenden.WebHome

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1 -XWiki.wikibot
1 +XWiki.wyun
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12 12  
13 13  If a student wants to run a computer intensive program at night, this is in principle not a problem, as far as the following points are taken into consideration:
14 14  
15 - in order to connect to lxhalle via SSH you have to enter in the terminal the passphrase, that is standing below your in.tum-Login (Informatik/RBG-Login). [[Here>>https://xwiki.rbg.tum.de/bin/view/Informatik/Helpdesk/Ssh_mit_PuTTY]] is !HowTo for Windows users, who should set up !PuTTY, which enables the ssh connection via terminal. {{{
16 -ssh RBG-Kennung@lxhalle.in.tum.de
17 -}}}
15 + in order to connect to lxhalle via SSH you have to enter in the terminal the passphrase, that is standing below your cit.tum-Login (CIT/ITO-Login). [[Here>>https://xwiki.rbg.tum.de/bin/view/Informatik/Helpdesk/Ssh_mit_PuTTY]] is !HowTo for Windows users, who should set up !PuTTY, which enables the ssh connection via terminal. {{{ssh ITO-Kennung@lxhalle.in.tum.de}}}
16 +
18 18  * in order the programs to work without harming other computer users, they should be started with one of the lowest possible scheduling priorities. This happens with the command \“nice -n19\” as shown in the HowTo example.
19 19  
20 20  {{html wiki="true"}}
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29 29  %CODE{ lang=\"bash\" }% #!/bin/bash while true do sleep 1 date done >> datum.txt
30 30  
31 31  %ENDCODE%
31 +
32 32  ----
33 33  
34 -{{id name="NohupAnchor" /}}
34 +{{id name="NohupAnchor"/}}
35 +
35 35  == 3. nohup ==
36 36  
37 37  In case a program is started with the nohup command, the HUP-signal, that is send by the logout is ignored. So the program proceeds further even after the user has already logged out
38 -* the following input {{{
39 -nice -n 19 nohup ./test.sh &
40 -}}} starts the test script and the control operator (##&##) makes the command run in the background.
39 +
40 +* the following input {{{nice -n 19 nohup ./test.sh & }}}starts the test script and the control operator (##&##) makes the command run in the background.
41 41  * from now on the date is written in the file ##datum.txt##, even after the user logs out
42 42  * after running ##nohup## the PID of the process is shown. PID can be used to close a program (if it doesn’t terminate automatically), to do so you should enter the following command ##kill PID##.
43 43  * now you can continue your work in the terminal or you can close it without terminating the program
44 44  * by logging out and then once again in, you can check, whether in the file ##datum.txt## it’s still written
45 -[[image:https://xwiki.rbg.tum.de/bin/download/Informatik/Helpdesk/ProgrammeBeimLogoutNichtBeenden/WebHome/nohupTest.png|| alt=""]]
45 +[[image:https://xwiki.rbg.tum.de/bin/download/Informatik/Helpdesk/ProgrammeBeimLogoutNichtBeenden/WebHome/nohupTest.png]]
46 +
46 46  ----
47 47  
48 48  == 4. screen ==
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51 51  
52 52  
53 53   First here are some basic control commands:
54 -* start screen:
55 -** {{{
56 - nice -n 19 screen
57 -}}}
58 -** command for starting a session with customized name (in our case named sitzung1) {{{
59 - nice -n 19 screen -S sitzung1
60 -}}}
55 +
56 +* start screen:
57 +** {{{nice -n 19 screen}}}
58 +** command for starting a session with customized name (in our case named sitzung1) {{{nice -n 19 screen -S sitzung1}}}
61 61  * at the beginning some information for the program is shown and then you can click the space bar, the console will still remain unchanged – you have started the screen session and you are now in the first virtual console
62 62  * start one more virtual console:
63 63  ** ##Strg## + ##A## and then ##C##
64 -* close a virtual console:
62 +* close a virtual console:
65 65  ** ##Strg## + ##A## and then ##K##
66 -* switch between the virtual consoles:
64 +* switch between the virtual consoles:
67 67  ** ##Strg## + ##A## and then ##Leertaste##
68 68  ** ##Strg## + ##A## and then number between 0 and 9 (for the corresponding console)
69 -* detach the current session:
67 +* detach the current session:
70 70  ** ##Strg## + ##A## and then ##D##
71 -** for a certain session (in this case sitzung1) {{{
72 - screen -d sitzung1
73 -}}}
74 -* reestablish connection to a session (here sitzung1)
69 +** for a certain session (in this case sitzung1) {{{screen -d sitzung1}}}
70 +* reestablish connection to a session (here sitzung1)
75 75  ** screen -r sitzung1
76 -* end session
72 +* end session
77 77  ** ##Strg## + ##D##
78 -** {{{
79 - exit
80 -}}}
74 +** {{{exit}}}
81 81  ** close the last virtual console
82 -* list all running session with their names (example in picture be 6561) {{{
83 - screen -ls
84 -}}}
85 -[[image:https://xwiki.rbg.tum.de/bin/download/Informatik/Helpdesk/ProgrammeBeimLogoutNichtBeenden/WebHome/screen.jpg|| alt=""]]
76 +* list all running session with their names (example in picture be 6561) {{{screen -ls }}}
77 +[[image:https://xwiki.rbg.tum.de/bin/download/Informatik/Helpdesk/ProgrammeBeimLogoutNichtBeenden/WebHome/screen.jpg]]
86 86  * show all keyboard shortcuts
87 87  ** enter ##Strg## + ##A## and then ##?##
88 -* refer to the man pages for the full documentation of the screen command {{{
89 - man screen
90 -}}}
80 +* refer to the man pages for the full documentation of the screen command {{{man screen}}}
91 91  
92 -
93 93   Steps for using the screen (see the commands above):
83 +
94 94  * start programs
95 95  ** open terminal window
96 96  ** start screen – thereby automatically creating a session, that is attached
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98 98  ** start new consoles and programs if needed
99 99  ** detach the current sessions
100 100  ** close terminal window
101 -* end programs
91 +* end programs
102 102  ** open terminal window
103 103  ** list all running screen sessions
104 104  ** resume desired screen sessions
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109 109  {{html wiki="true"}}
110 110  <hr />
111 111  {{/html}}
112 -
113 -