Author: Linux Questions

Multiple linux questions and answers for beginners and professionals with a list of top frequently asked linux questions and answers.

Development Linux

Startx as non-root user via SSH

Post author By Linux Questions
Post date November 26, 2019
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I have a remote VM running Ubuntu 1804 and would like to run VNC. I am using x11vnc, which requires an X server to be running. Currently, I’m connected through SSH. The VM has an Nvidia card, and after generating the xorg.conf with nvidia-xconfig, I can start an X session using startx, but only as […]

Tags and after generating the xorg.conf with nvidia-xconfig, but only as root. Any subsequent connection via VNC is with root, I can start an X session using startx, I get the following: /usr/lib/xorg/Xorg.wrap: Only console users are allowed to run the X server If I change the /etc/X11/Xwrapper.config t, I get the following: Couldn't get a file descriptor referring to the console I've been reading that connecting via SSH doesn't mean that yo, I have a remote VM running Ubuntu 1804 and would like to run VNC. I am using x11vnc, I'm connected through SSH. The VM has an Nvidia card, which I want to avoid. The Device section in xorg.conf file looks like this: Section "Device" Identifier "Device0" Driver, which requires an X server to be running. Currently, which you need to run startx. Trying to change to a text console with chvt fails doesn't change anything. Is there anyway that I can launch

Development Linux

Allow the contents of a server port to be accessible to public

Post author By Linux Questions
Post date November 26, 2019
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I have a live, automatically updating plot(using Bokeh) in python being displayed in a remote Linux server(set up by my university for me) at its port 127.0.0.1:5006. Usually, I have to connect to the server through SSH with a port forwarding enabled for that address to see the plot in my local machine. My question […]

Tags 385 ServerConnection created reading new data reading new data 2019-11-26 10:54:41, 385 WebSocket connection opened 2019-11-26 10:53:23, 574 WebSocket connection closed: code=1001, 916 Starting Bokeh server version 1.4.0 (running on Tornado 6.0.3) 2019-11-26 10:53:19, 918 User authentication hooks NOT provided (default user enabled) 2019-11-26 10:53:19, 921 Bokeh app running at: http://localhost:5006/datashow 2019-11-26 10:53:19, 921 Starting Bokeh server with process id: 7116 2019-11-26 10:53:23, automatically updating plot(using Bokeh) in python being displayed in a remote Linux server(set up by my university for me) at its port 127.0, color=f[i]) # Set up widgets button = Button(label='Refresh Plot') button.on_click(update_data) inputs = column(button) curdoc().add_root(r, ColumnDataSource from bokeh.plotting import figure # Callbacks def update_data(): print("reading new data") df1 = read_pickle('weeklyd, i, I have a live, I have included them here. ''' Use the ``bokeh serve`` command to run the example by executing: bokeh serve sliders.py at your command prom, I have to connect to the server through SSH with a port forwarding enabled for that address to see the plot in my local machine. My question, legend_label=i, line_color=f[i]) p.circle('index', OAH='red') source = ColumnDataSource(df) # Set up plot p = figure(x_axis_type="datetime") for i in df.columns: p.line('index', P, reason=None Interrupted, row from bokeh.models import Button, SAT='orange', Setpoint and Humidity Variables" This generates the output 2019-11-26 10:53:19, shutting down I want to keep the server running at the above mentioned port so that anyone can only see the plot live with a choice to updat, size=10, source='source', that they can see the plot without the problem of SSH ing ? Is it at all possible? Update: Required code for details of implementation. Sinc, the ip address of my server (let's say 123.12.12.123) and the port where to look for, what do I need to do so that if I tell anyone, width=800)) curdoc().title = "Time Series of Temp.

Development Linux

Comparing two tsv files

I am trying to compare two tsv files. The file to be queried (file1) looks like: Chr Start End chr1 234738546 234738934 chr1 234792654 234793537 chr1 234908151 234908864 chr1 235097868 235098170 chr1 236080566 236081347 chr1 240307621 240308262 chr1 240308207 240308637 chr1 240308546 240308962 chr1 242627058 242627262 chr1 243923195 243923709 The second column of another file […]

Tags $2}; break; else continue}' > rohit_TSS.txt; done < file1, 242627060 where the - separated coordinates are from file1 and the comma separated from second column of file2. I have already tried using, between the numbers in column 2 and 3 in the and repeat it until condition is satisfied. eg: 242627060 lies between 242627058 & 242627262 F, col2, col3, I am trying to compare two tsv files. The file to be queried (file1) looks like: Chr Start End chr1 234738546 234738934 chr1, if lying

Development Linux

Create and use custom .profile file

Post author By Linux Questions
Post date November 26, 2019
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Our current Linux distribution doesn’t show .proflle file in the user home folder, but as we are using ksh shell, we have the .kshrd file available. However, without playing with the kshrc file, can I create my own .profile that will contain custom environment specific details required for script run, and how can I use […]

Tags and how can I use it in my scripts? Thank you., but as we are using ksh shell, can I create my own .profile that will contain custom environment specific details required for script run, Our current Linux distribution doesn't show .proflle file in the user home folder, we have the .kshrd file available. However, without playing with the kshrc file

Development Linux Python

How to process all files in a folder with python code

Post author By Linux Questions
Post date November 26, 2019
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I have the following code in python: #/usr/bin/python from Bio import SeqIO count = SeqIO.convert(“genome1.gbk”, “genbank”, “genome1.fasta”, “fasta”) print(“Converted %i records” % count) This code converts the genbank file “genome1.gbk” to a fasta file “genome1.fasta”. But now I want to convert all files in the current folder with this code. All the files in the […]

Tags “fasta”) print("Converted %i records" % count) This code converts the genbank file "genome1.gbk" to a fasta file "genome1.fasta". But now I, “genbank”, “genome1.fasta”, but I don't know exactly how to change this code. Any help is appreciated, I have the following code in python: #/usr/bin/python from Bio import SeqIO count = SeqIO.convert(“genome1.gbk”

Development Linux

Executing a Program with input

Post author By Linux Questions
Post date November 26, 2019
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I would like to be able to run a program and then feed that program some information all in one line on startup. Suppose I am in the working directory of the executable (sage), I can run ./sage -c “print(‘hi’)” and it will write hi to the terminal. It’s clearly fed sage the command to […]

Tags and in pascal the best I can do is write one line to the terminal, and then feed it a command and leave it running. Is this possible? It feels like it should be because -c is able to feed it a command. Pleas, and then grabbed the output. What I would like to do is feed it that print command, but then also keep the program running in the background until I close the terminal. Is there some way to do this? To further describe it, I can run ./sage -c "print('hi')" and it will write hi to the terminal. It's clearly fed sage the command to print, I would like linux to start ./sage, I would like to be able to run a program and then feed that program some information all in one line on startup. Suppose I am in the working, so I do not have the ability to do multiple lines., wait for it to open

Development Linux

Multicast packets being dropped at IP layer?

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Post date November 26, 2019
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External multicast data is being received by machine #1 and forwarded to machine #2. On machine #2 I can see the multicast packets being received when I use tcpdump, ethtool and netstat -i (ethernet layer). However, when I run netstat -s -u the number of UDP packets isn’t increasing, nor is InMcastPkts but InOctets is […]

Tags ethtool and netstat -i (ethernet layer). However, External multicast data is being received by machine #1 and forwarded to machine #2. On machine #2 I can see the multicast packets being rece, nor is InMcastPkts but InOctets is increasing. So my guess is packets are being dropped in the IP or UDP/TCP layer? How can I confirm this a, when I run netstat -s -u the number of UDP packets isn't increasing

Development Linux

Why would a ssh password-based login fail?

Post author By Linux Questions
Post date November 26, 2019
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I currently use ssh keys to connect to my server (Ubuntu 18.04). I would like to allow (in a specific, limited scope) the ability to login with passwords. Whenever I try, my passwords fail. below is a session where I set a password, then try to use it: ~ # id uid=0(root) gid=0(root) groups=0(root) ~ […]

Tags I currently use ssh keys to connect to my server (Ubuntu 18.04). I would like to allow (in a specific, I have no clue why the server accepts a new password, limited scope) the ability to login with passwords. Whenever I try, my passwords fail. below is a session where I set a password, please try again. I apologize if this is something obvious, then accepts a password-based login to finally reject the credentials., then try to use it: ~ # id uid=0(root) gid=0(root) groups=0(root) ~ # passwd Enter new UNIX password: Retype new UNIX password

Development Linux

Tweak to create 50+ VNC/Gnome sessions (dubs/systemctl limits)

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Post date November 26, 2019
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I am trying to create 50 VNC display session on a CentOS 7.6 machine. I created a local user. Once logged in, I could create only 9 sessions. After this VNC Server starts, immediately errors out with Sample VNC log Copyright (C) 1999-2017 TigerVNC Team and many others (see README.txt) See http://www.tigervnc.org for information on […]

Tags I am trying to create 50 VNC display session on a CentOS 7.6 machine. I created a local user. Once logged in, I could create only 9 sessions. After this VNC Server starts, immediately errors out with Sample VNC log Copyright (C) 1999-2017 TigerVNC Team and many others (see README.txt) See http://www.tigervnc.or, port 5959 vncext: created VNC server for screen 0 /localhome//iesdvnc/.vnc/xstartup: line 5: 28820 Trace/breakpoint trap /etc/X11/xin, The X.Org Foundation Mon Nov 25 12:42:38 2019 vncext: VNC extension running! vncext: Listening for VNC connections on all interf

Development Linux

how to parse multi dynamic lines while on one of the lines?

Post author By Linux Questions
Post date November 26, 2019
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I have a directory with some text files that have data like below, I read them via a loop and put each line in an array! ( first of all as a starter I don’t the correct way if you know any better way let me know ) Attack On Titan S03E20 720p WEB x264-URANiME[eztv] […]

Tags added time, and leech. So I read each line of Array with: for array_list in "${TORRENT_FILE_ARRAY[@]}" do TORRENT_NAME=`echo "$array_list" | awk '{, as torrent name, I have a directory with some text files that have data like below, I read them via a loop and put each line in an array! ( first of all as a starter I don't the correct way if you know any better way let me k, in sample data, result in fiel 20 ( EPISODE 20 ) SEASON 3 would be like this: Attack On Titan S03E20 720p WEB x264-URANiME[eztv] Attack On Titan S03E20 WEB, seeds:'', size(with MB/GB extension), we have two "EPISODE 20" in SEASON 3, we should consider which one of them we have to append to "EPISODE 20". So there are 3 Constraints with priority for sorting each torrent fi, what we have to do? We have to append torrent file names to the file "EPISODE 20" in the SEASON 3 directory but first, with some constraints. dst ├── 2 └── 19 └── 3 ├── 1 └── 20 what constraints? For example