13
votes
1answer
4k views

Understand logging in Linux

As I understand, Linux kernel logs to /proc/kmsg file(mostly hardware-related messages) and /dev/log socket? Anywhere else? Are other applications also able to send messages to /proc/kmsg or /dev/log? ...
3
votes
3answers
364 views

Specific column level substitution

If I have a file with columnar entries, is it possible to substitute specific entries from a specific columns only and save changes to the same file?? Example a file abc.txt: SR|FRUITS|COLOR| ...
0
votes
3answers
455 views

Merge (combine) directories using rsync

I need to create deploy script to combine directories ├── LIB_COMMON │ ├── file1.php │ ├── file2.php │ ├── file3.php │ └── file4.php ├── LIB_CZ │ ├── file2.php │ ├── file3.php │ ├── ...
2
votes
2answers
136 views

Is it possible to remotely log into an FTP account without installing any software?

I'm trying to work remotely on a project that I have stored in a server, but the computer I am on belongs to the university and I don't have any keys nor permission to install anything. Could it be ...
1
vote
1answer
34 views

Pasting with vim squeezes content in between previous content and margin

I'm learning my way around the vim and got around to copy-paste. Or yank-paste. Now when I try to paste a yanked piece of text, it pushes previous content to the right and squeezes in on the left. I ...
20
votes
5answers
26k views

Viewing all iptables rules

I just wanted to ask if there's a way to view iptables rules in a bit more detail I recently added masquerade to a range of ips iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE ...
1
vote
2answers
112 views

Triggering hardware interrupts by connecting parallel port pins 9 and 10 does not work

I want to trigger hardware interrupts as described in the book Linux Device Drivers by connecting pins 9 and 10 with a wire. I tried that but apparently there's no interrupt beeing triggered: cat ...
0
votes
0answers
64 views

Arch Linux PXE call url / script after installation

I am booting an Arch Linux net install image via PXE and would like to be able to call a script or url after installation or on shutdown of the PXE image. Is there any APPEND option to do so? I tried ...
1
vote
2answers
310 views

Shell script exit code and logging

I have got following simple shell script, in which I am trying to send STDERR & STDOUT to both screen and log it in a file(test.log). Also, while exiting I am trying to exit with appropriate exit ...
3
votes
0answers
225 views

Make systemd reload only single openvpn process and not the whole group

I'm running several openvpn instances on my server with debian stable; as well some clients as a server instance. Right now, when one of these instances fails, systemd seems to kill and restart the ...
1
vote
1answer
280 views

Static IP changes to dynamic automatically after time

I have found only one discussion about my problem here, but not a solution. I have access to one Debian 7.8.0 amd64 virtual machine (under VMware) and its IP address is gained through DHCP, e.g., ...
0
votes
3answers
682 views

how to tell crontab to execute the command from now instantly

I have a command in "/etc/crontab" which runs a database program every 7 days. Now, I see that this command has been commented by another user for 2 weeks. I immediately uncommented the line, and ...
0
votes
0answers
14 views

PartImage: what is the cancelatio key?

PartImage is nice for partition image creation, but I can not find what is the key to cancel the operation when I made a mistake. For example: What key is that [* supposed to be? I have not been ...
1
vote
1answer
76 views

man page search - how can I turn off the highlighting after matches found?

When using man pages, a commonly used feature is to use / then a search term to get to a word of interest. Once found, all matches remain highlighted - this can often be distracting when I just want ...
3
votes
1answer
162 views

Linux doesn't drop FS Caches. Instead Memory starts Swapping

I'm quite confused about this behaviour of linux memory caching. total used free shared buffers cached Mem: 15953 14188 1765 64 ...
0
votes
2answers
292 views

Unable to login with SSH-RSA key

This post is following this question : Authentication refused: bad ownership or modes for file /var/git/.ssh/authorized_keys . The issue as exposed there is solved (about files modes of the ...
1
vote
0answers
108 views

Capturing screen of “perf top” or other interactive programs

I'm trying to write a script to capture output of perf top Similar to top, perf top detects the screen size and fill information to the screen. But sadly unlike top which has a batch mode, perf does ...
4
votes
3answers
7k views

Authentication refused: bad ownership or modes for file /var/git/.ssh/authorized_keys [duplicate]

EDIT The issue as exposed here is solved (about files modes of the .ssh folder. But an other issue persists so I create a new question : > Unable to login with SSH-RSA key I can no longer ...
2
votes
1answer
3k views

Can't get GUI login screen on Debian Jessie [after upgrade from Wheezy]

As the title explains. Upon boot GDM3 is correctly started but hangs at the splash screen and no GUI login box appears. The only way to log into the system and graphical interface is following these ...
1
vote
2answers
81 views

Substrings in shell script

Am trying to get a substring from a string but am getting the error: ${curr_rec:3:4}: bad substitution #!/bin/ksh get_file_totals() { if [ -e "$file_name" ] then IFS='' ...
2
votes
2answers
94 views

What allows a command to be typed while the previous command is still running in foreground?

Sometimes I have seen when one program (say A) is running in the foreground and printing its output to stdout, I can type another command (say B), and when I press Enter it is run, even though I had ...
4
votes
2answers
549 views

sshfs over mosh tunnel

I am using sshfs over ssh tunnel. The reason for this is because I do not have direct access to machine from which I want to mount file system. This command establishes me tunnel: ssh -o ...
0
votes
0answers
51 views

Remove or decrease JAVA Security openjdk AWS centos instance

How to decrease or remove java security level in CentOS openjdk? I tried removing the java security level but I didn't find any option, my OS is in an ec2 aws machine.
0
votes
0answers
163 views

busybox tab completion in vi mode

When I use busybox and switch editing mode to vi via set -o vi then tab completion stops working. When I switch back set -o emacs then tab completion starts working again. # set -o vi # ls -l ...
0
votes
1answer
296 views

systemd kill my processes before ExecStop completed

I'm trying to update my application to use it with systemd. When I have used Upstart, I've just create a /etc/init.d/myService script: #!/bin/bash #chkconfig: 2345 90 10 #description: myDescription ...
1
vote
2answers
109 views

Delete files that are not part of a bash array

Right now I backup the mysql databases using a cronjob everyday. Now that the server is getting full, I only want to keep one backup for every month, one backup from sunday every week and the last 7 ...
0
votes
1answer
268 views

Disable PAM login but keeping landscape-sysinfo y motd

Running Ubuntu Server, I have no need for PAM login, and thus disabled this service in the sshd_config file. However, oddly, there is some login info that is only displayed if you enable PAM logins ...
2
votes
3answers
2k views

How to create root user account in Debian?

I installed Debian OS today and while installation I skipped the option to create root user and chose to use sudo. Now I would like to create root user account. Is there any way to create the root ...
0
votes
1answer
132 views

Add parameter to admin file for pkgrm

I'm trying to do a pkgadd on Solaris with non-interactive. Somehow pkgadd -d /home/mypackage -n doesn't work. While reading the man page, I found out that i can disable interaction by using admin ...
2
votes
2answers
109 views

How to make ssh connection to LXC container by its name?

Is it possible to make ssh connection to lxc container by its name? I have been using IP addresses but then I though how easy it would be to use ssh test01 (here test01 being container name) instead ...
0
votes
3answers
510 views

Throw away standard output and error

I have redircted my ouput using /dev/null in bash script but it is still throwing an error. Code is following ps -p $proc | fgrep $proc> /dev/null if [ $? -ne '0' ] ; then ...... fi below is ...
1
vote
1answer
65 views

In ShellScript, how to call a function after completion of function which is already running?

My script involves three shell functions. Two running in parallel. I have to call a third function when the two parallel running function completes it's execution. How to call that third function? ...
2
votes
1answer
61 views

Suppress questions by apt-get

I need to install a package in a script. This process needs to write over some already existing configuration files. Right now even though run with DEBIAN_FRONTEND=noninteractive and --force-yes -y, ...
1
vote
1answer
45 views

X without Display Driver

If I would install xserver and a window manager without installing an display driver (xorg-video-intel for example) would the performance suffer a lot? Would I actually see or feel a difference in: ...
0
votes
3answers
1k views

DNS Issue in ubuntu 14.04

I am facing DNS resolving issue sometimes in my Ubuntu 14.04.2 LTS trusty. I have configured my system with network manager to work with static IP assignment. I have also tried by changing DNS server ...
1
vote
0answers
58 views

Clear the terminal in “vi” mode? (equivalent of “ctrl+l” from “emacs” mode) [duplicate]

I am aware of Ctrl+L on bash terminal (using it on Ubuntu) which clears the screen by applying appropriate scrolling on bash terminal. After learning that the terminal is by default set to emacs mode ...
0
votes
0answers
13 views

Changing from bash-4.3$ to [user@hostname currentfolder]# [duplicate]

I'm tring out different linux distros. I've settled on Fedora, but I'm a bit confused. On my other distros, my terminal would open up with a [user@hostname currentfolder]# before each prompt. Now I ...
3
votes
3answers
53 views

Is there a way of listing all the instances when a particular file was modified/edited?

I currently have a file abc.txt. I am curious to know if it is possible to see all the instances when this file was edited, from the date it was created? Q: How can I make it possible [if I would ...
2
votes
0answers
225 views

Letter Q stopped working on keyboard [closed]

Letter Q and q stopped working on my keyboard. (I had to find an ascii chart to copy and paste the character.) I really have no clue what's going on. xev produces the following output. ...
0
votes
1answer
35 views

.txt File from Mac not converting properly

I have a .txt file from my Mac that when I send it over to my Raspberry Pi running Raspbian and open it in nano it converts weirdly. Example: Text file in Mac OSX: ...
13
votes
3answers
464 views

Unexpected Bash completion of ~ on OS X

I pressed ~TabTab on the bash command prompt and got an unexpected set of completions. First it looked like all the folks in the /Users directory, and a lot more. Then I thought it was doing the ...
1
vote
1answer
173 views

I am attempting to write a bash script to convert hex to base64

I am attempting to do the matasano cryptopals challenges in bash. The first step is here I found this stackexchange thread with a partial solution. printf 49276d2 | xxd -r -p | base64 which ...
0
votes
2answers
160 views

How are the entries in resolv.conf automatically added?

I have installed a fresh Debian Jessie distribution today. It properly configured IP address through DHCP and also added nameserver entry in /etc/resolv.conf. Could you please explain how are those ...
0
votes
0answers
44 views

no fonts showing up in filesnames in thunar (and pcmanfm). debian 7.8

I had recently installed a debian 7.8 system. I connect to it both locally from the attached monitor , but also remotely from an nx session. "Fluxbox" is the desktop environment and "thunar" the file ...
0
votes
0answers
49 views

Use sudo as login

I've picked up the habit of using sudo and disallowing root logins. In cases, sudo is integrated with GUI configuration tools that require it. Are there any serious efforts to replace login and ...
0
votes
4answers
425 views

“emacs: standard input is not a tty”

I followed http://unix.stackexchange.com/a/43460/674: after $ locate -i linux | less I type g|$emacs - in less, but nothing is opened in Emacs, and the terminals says: emacs: standard input is not ...
1
vote
0answers
304 views

Unable to mount a partition on an SSD over USB

I'm trying to mount a 120GB SSD connected externally via USB to the new server. The SSD is full of data and I can't format it. mount /dev/sdd1 /mnt/sdd1 mount: wrong fs type, bad option, bad ...
2
votes
0answers
150 views

Will booting ubuntu in recovery mode use default keyboard layout?

I have a chromebook with Ubuntu 15.04 and I need to customize some of my keyboard keys in xkb. Unfortunately while doing so I managed to disable my keyboard and needed to boot from live USB to revert ...
2
votes
1answer
94 views

POSIX shell scripting and performance tuning [closed]

Nowadays, I'm researching for performance tuning for shell scripting , And I have been prevented to POSIX shell scripting, However it's only a standard, But I think it's rathar than standard for do ...
0
votes
1answer
321 views

WPA_Supplicant bgscan doesn't populate scan_results

I'm using WPA_Supplicant 2.1 with Wext driver, on a custom Linux 2.6.27 kernel. The issue is that bgscan fails to populate 'scan_results' other than the network that wpa_supplicant is currently ...

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