3
votes
2answers
788 views

Link value is 2 by default for folders

Can anyone help me to understand the logic behind the link value being "2" for the first time when we create any folders/ directory in linux. I searched a lot , but couldn't get satisfactory logic
3
votes
3answers
3k views

Script to email all matching files in a directory

Trying to set up a bash script to automate sending data files. Desired end result is to check a specified directory once per week, make a list of all Excel files modified within the last 2 days, and ...
3
votes
4answers
590 views

How to find the packages that depend on a certain package in apt?

How can I get, not the dependencies of a package, but the packages that are depending on a certain package? I'm on debian 6.0 Squeeze-LTS (the first-time extension to squeeze for long term support!) ...
3
votes
3answers
309 views

Interactive command usage reference: do you generally have that on Unix?

The question of why some commands rely on manpages whereas others rely on something like the --help flag for providing command usage reference is not new. There is usually a difference in scope ...
3
votes
1answer
951 views

Having some trouble authenticating via proxy in order to use apt-get successfully on a corporate network

Our server is on a corporate network, which requires corporate proxy authentication (e.g. enter corporate username and password). This is not an issue on the Windows machines on that network - when a ...
3
votes
1answer
115 views

Test for a particular file format

This is a followup to Normal looking text file, detected by file as ASCII Pascal program text It seems file can't be trusted all the time. It seems possible that a particular file may be detected ...
3
votes
1answer
418 views

How to differentiate USB flash drive and CD-ROM?

I want to differentiate an USB flash drive and a CD-ROM. My requirement is when I connect to a system only the CD-ROM should work, but not the USB key.
3
votes
3answers
2k views

detect process eating cpu without: top, htop, ps?

I went thru a problem where I could only guess what process was eating the cpu. My cpu usage was about 80% for all cores at psensor. I tried htop, top and ps -A -o pcpu,pid,cmd --sort +pcpu (the ...
3
votes
0answers
259 views

Is there a more elegant way to unlink two tmux clients sharing a session from inside tmux?

This is almost a code-review question, but very *nixy and more about configuration than code. For years since I switched to tmux from screen I've had a couple of nagging issues that I could not make ...
3
votes
1answer
141 views

How to use my login password to do two things

I have a CIFS drive that I mount regularly, and it requires a password for it. Since it's annoying to type my password every time, I wrote a script that sets the PASSWD environment variable, mounts ...
3
votes
2answers
282 views

how to set and use multiple parameters in single environmental variable in fish shell

I want to use following in fish shell: $ export arm='ARCH=arm CROSS_COMPILE=arm-eabi-' $ make $arm This works fine in bash/zsh but not on fish shell. But if I execute the following in fish shell: ...
3
votes
1answer
208 views

Get device with major number 0 (btrfs subvolume)

When I stat a file on a btrfs subvolume I get a major device number of 0. Is there a reliable way to find the mount point of this device, without knowing in advance it is a btrfs subvolume? e.g. I'd ...
3
votes
1answer
823 views

How to move a window to a different workspace using its ID, in bash?

Currently I have successfully used wmctrl -r :SELECT: -t 2 but something like wmctrl -r -i 0x03e00003 -t 2 does not work. How should I write the command in order to select the window to be moved ...
3
votes
2answers
5k views

Comparison of decimal numbers in bash

My search this morning was about how could I compare two decimal numbers in bash, and I came to this answser: How to compare to floating point number in a shell script. This one, however, doesn't ...
3
votes
3answers
6k views

How to get previous year and previous month in solaris 8

How to get previous year and previous month in solaris 8? I have tried below command but none of them is correct: date +'%m' -d 'last month' date +'%Y' -d 'last year'
3
votes
2answers
3k views

How to count how many shell/terminals are running?

I´m trying to count how many shell or terminal windows are currently running. I tried ps a|grep bash; ps a|grep tty; But it can be inaccurate.
3
votes
10answers
4k views

Finding the maximum of the values in a file

I have a file which contains several numbers, as follows. 21 12 33 35 21 12 33 44 52 63 14 12 23 34 11 12 13 53 1 12 43 33 44 How can I find the maximum of these values, which is 63? I wanted to ...
3
votes
1answer
6k views

ElementaryOS Gala using more than 100% CPU constantly

I am using ElementaryOS with the default Drivers and my Gala process is constantly using tons of CPU (sometimes more than 200%). I have looked everywhere but couldnt find a solution. I tried to ...
3
votes
2answers
2k views

How to find data copies btrfs

I have deduplicated my btrfs filesystem with bedup, so now all duplicate files (above a certain size) are "reflink" copies. Is there any way to see, given a filename, what other files are the same ...
3
votes
3answers
6k views

Compare two files for matching lines and store positive results [duplicate]

I have two files. File 1: A0001 C001 B0003 C896 A0024 C234 . B1542 C231 . upto 28412 such lines File 2: A0001 A0024 B1542 . . and 12000 such lines. I want to compare File 2 against File 1 ...
3
votes
1answer
364 views

Set environment inside `nsenter /bin/bash`

I'm entering a namespace with nsenter -m -u -i -n -p -t $PID /bin/bash. However, printenv inside this namespace doesn't have everything I need. I'd like to send these variables in, but I'd like to ...
3
votes
2answers
1k views

dumpe2fs - lifetime writes - what is it

For example, if I run: sudo dumpe2fs /dev/sda1 I get detailed information about the partition. I'm confused about this part, Lifetime writes, returns the following for my boot partition: Lifetime ...
3
votes
2answers
1k views

Is pvcreate destructive? Attempting to recover an lvm2 volume group

I don't want to lose any data, so I'm asking if the solution Novell offers is safe to try. If not, are there safe alternatives? Step-by-tedious-step: I have two volume groups: main and Rand; Rand ...
3
votes
5answers
337 views

Merging Two Files columns in order

I want to merge two files. Files A.txt 001;abc;def;ghi;jkl;pqr 002;abc;def;ghi;jkl;pqr 003;abc;def;ghi;jkl;pqr 004;abc;def;ghi;jkl;pqr 005;abc;def;ghi;jkl;pqr . Second File B.txt 001;mno 002;mno ...
3
votes
5answers
531 views

How can I force a script to use more resources?

I'm running a very time-consuming script which takes many hours to end. Watching top I see that it's only taking 5% of the CPU at best, usually around 3%. Is there any way to force the script to use ...
3
votes
1answer
1k views

How to find files that contain newline in filename?

I am trying to find files that have a newline in the filename. But I can't figure out what pattern to use. The following works, but is not very useful if I want to use it in indented code. find . ...
3
votes
2answers
2k views

wget to get list of files

im using wget in a bash script to get a list of files from a website, the files are sequential and in the format http://site.com/00001.csv etc, is there a way to terminate/end the script when I hit ...
3
votes
4answers
5k views

USB keyboard doesn't work with Debian installer

I have a wired USB keyboard. I've written the latest netinstall Wheezy image on my USB pendrive (using dd). It boots but the installer doesn't recognize the keyboard! (The same pendrive works on my ...
3
votes
3answers
7k views

Mail command to send attachements

I tried the below command uuencode data.txt | mailx –s “Test Mail” “mrp@xyz.com” But I get the below error ksh: uuencode: not found. Null Message body; hope that' ok which clearly tell that ...
3
votes
1answer
6k views

How to start dbus with a fixed address?

The issue concerns the same thing which is described here and here, but I don't see a clear solution there. I mean I have the same error: Failed to connect to socket /tmp/dbus-CwQMg2RxWx: Connection ...
3
votes
4answers
2k views

Connect to the Internet on a VPN connected server without Internet

I've a remote server which is not connected to the internet, but I can connect from via SSH to it through a VPN tunnel. On this client I got internet. Is it possible 'get internet' from the client ...
3
votes
1answer
190 views

What are the purposes of the different types of XWindows fonts?

In my /usr/share/fonts/ I have four sub-directories categorizing types of fonts: cmap truetype type1 X11 The command fc-list produces a list of them. Are these different categories for specific ...
3
votes
1answer
3k views

Remove Text from Active Programs in Panel

In the panel, how can I remove the text next to the icons of my active programs? All I want to show is the icon. Specifically, in the example below, I want to get rid of where it says "Disc...", ...
3
votes
3answers
308 views

API with no system calls

The book 'Understanding Linux Kernel' says that 'for something abstract such as math functions, there may be no reason to make system calls'. Can any one please explain how is a system call not ...
3
votes
1answer
2k views

gnome-terminal unicode chars not showing - Locale is set to en_US.utf8

I've become stumped trying to get my terminal to show unicode characters. I've set the LOCALE/LANG environment variables to en_US.utf8: locale LANG=en_US.utf8 LC_CTYPE=en_US.utf8 ...
3
votes
1answer
265 views

Why starting firefox (from command line) in VM starts the firefox in the host machine and vice-versa?

I have a SLED 10 host machine and I am using a SLES 10 VM via ssh -X. When I start firefox in my VM using firefox & then it runs the firefox which is installed in the VM. So that's fine. ...
3
votes
2answers
4k views

Remove scientific notation bash script

When I convert MB to GB I'm getting below output. I want this output in normal format. When I use bc I'm getting an error. The text file contains nearly 100 such lines like this. I want to print this ...
3
votes
2answers
491 views

grub on floppy to rescue CD boot chain

I am having trouble figuring out how to have grub installed on a floppy in a way that it automatically boots a modified Ubuntu 12.04 CD on startup. I will settle for knowing some commands at the grub ...
3
votes
1answer
921 views

Ubuntu / Mint brightness 0 by default on login

Every time I boot up Ubuntu or Mint, after choosing an OS from GRUB menu, before logging in, screen brightness is set to 0. What is the reason behind that? I always end up manually turning on the ...
3
votes
1answer
411 views

Getting size of directories and exclude some folders

I have an directory structure like this: application1 application1_edit application2 application2_edit Is there any way to get the total size for every folder (including sub-directories) and ...
3
votes
1answer
259 views

Discover clients connected to a network [duplicate]

How can you discover who is connected to a wifi network near you? (you not being connected to it). I know that some tools can scan your own network, and that some tools like Wireshark can monitor ...
3
votes
1answer
724 views

Sharing serial device

I'm running Ubuntu and I need to share a serial device (/dev/ttyUSB0) using socat or something like it. Here is my diagram: /--</dev/ttyUSB01>--[Process A] ...
3
votes
1answer
230 views

What does it mean when something says that UNIX device files are static?

I've been reading up on udev. In the "overview" section, Wikipedia states that "unlike traditional Unix systems, where the device nodes in the /dev directory have been a static set of files, the Linux ...
3
votes
1answer
3k views

How to make EDID

I read the post here and I tried to make do with what I understood from the post but here are some questions: Where is the /lib/firmware located in for example /usr/src/linux/lib/firmware or ...
3
votes
4answers
1k views

List all open '.log' files in *nix

There are times as a system administrator, you might not be sure of the log file paths of a new application. Depending on the system, there may be multiple ways to find the same. Please share the ...
3
votes
3answers
1k views

Best way to benchmark different encryption solutions on my system

I want to compare different encryption solutions for encrypting my system, possibly different solutions for different parts of the system such as /usr or /home. In particular I look at dm-crypt ...
3
votes
1answer
4k views

Get all regex matches between two patterns and print them to file

I've got a file with a bunch of long lines. I'd like to grab every group between two patterns and print them to a new file, one match per line. I could manage to do this with Python, but I'd prefer ...
3
votes
4answers
651 views

How can I zero files out inside a VMware image file so that their space can be reclaimed?

is there a command on Linux to remove a file but zeroing it's contents first? so if i do, something like this: rm -rf /var/cache/pacman/pkg/* it would overwrite each file on that directory with 0 ...
3
votes
1answer
4k views

How to disable the 2.4Ghz band wireless adapter

For debugging purposes, is it possible to disable the 2.4Ghz for wireless connections on Linux (Linux Mint 13 LTS, Cinnamon). I.e. to enforce the network driver to establish connections using the 5Ghz ...
3
votes
1answer
2k views

systemd - umount device after service which depends on it finishes

I'm trying to implement a mechanism of automated backup using udev rules and systemd. The idea is to launch a backup routine upon hot-plugging a specific storage device, quite similar to this ...

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