5
votes
4answers
2k views

Spoofed MAC address ignored by wpa_supplicant?

I'm using wpa_supplicant to power my wireless card in my Ubuntu Server (yes I know wireless in a server is bad, but this is a special case) since it has the ability to automatically roam WAPs instead ...
5
votes
7answers
14k views

tar files only, no directories

I can probably write a shell script to find files only, then pass the list to tar, but I am wondering whether there already is a built-in feature in tar that allows doing just that, in a single ...
5
votes
2answers
1k views

How to switch X windows from the command-line?

How can I create a script that automatically switches windows? I'm trying to do the same thing Alt+Tab does.
5
votes
2answers
3k views

How to get 3 minutes future date?

I want to get the date 3 minutes on the future. For example, if "now" is 01-Jan-70 00:00:00 GMT I want to get 01-Jan-80 00:03:00 GMT How should I do it? I'm working with busybox linux.
5
votes
1answer
2k views

Change the red border between windows in xmonad

Is it possible to set somewhere in configuration the color of the border between windows from red to black or remove the border completely?
5
votes
3answers
8k views

Is it possible to export env variable via Upstart?

I need to export a variable FOO=stringhere so that system processes could use it. And the place I would like to do this, is Upstart job. Unfortunately, I tried as per Upstart manual to do env ...
5
votes
3answers
11k views

Is there a way to write a script to do ftp login so I don't have to type things over and over again?

I am recently working extensively with a remote system via ftp connection, since the session time is so short that I have to re-login quite often when I finish my work on my local machine, so I need a ...
5
votes
1answer
1k views

“unix:10.0” in DISPLAY variable

We are using Oracle Secure Global desktop to provide remote access to the Solaris desktop. It sets the DISPLAY variable to unix:10.0. It seems to be working as if the DISPLAY was set to ...
5
votes
2answers
15k views

“Permission denied, try again” while transferring files with scp

I have two servers (A and B) and my local machine. I'm trying to transfer a file from server A to server B. From server A: scp ./backup.tar user@server.b:/home/public/ Permission denied, please try ...
5
votes
3answers
3k views

ACPI problem with recent kernels

In recent versions of popular Linux distributions (Ubuntu, Fedora, Mint, Debian) I always have to put acpi=off into the kernel parameter list before I want to boot the computer. This happens to both ...
5
votes
2answers
900 views

Run commands after unlocking X screen (KDE)

When I leave work, I lock my machine with ctrl + l to lock the screen. When I come back, I always forget to log into jabber. Is there a way to run a command after the screen is unlocked? This is in ...
5
votes
2answers
3k views

OpenVPN on OpenWrt

I have a step-by-step guide for OpenVPN on an OpenWRT 10.03 router: (wl500gpv2) Needed packages opkg install openvpn_2.1.1-1_brcm-2.4.ipk kmod-tun_2.4.37.9-1_brcm-2.4.ipk ...
5
votes
2answers
615 views

Run mpirun and ssh-add remotely on the same session

I am developing a program that is running on multiple machines using MPI. I have machines on Amazon EC2 where I can start mpirun from one of them (the master). Everything works as I expect if I ssh ...
5
votes
5answers
625 views

How do I remove a file I accidentally created named $file?

I was working on a shell script and I accidentally created a file with the variable as its name. Now I have $file in my ls output, and cannot remove it. What can I do?
5
votes
1answer
1k views

MediaTomb - Not showing Cover Art from music folder in the photo collection

MediaTomb adds album covers and DVD covers into the photo collection. That means, when you are going through your photos, you also get album covers intermixed in there. Is there a way of restricting ...
5
votes
4answers
7k views

Can IFS (Internal Field Separator) function as a single seperator for multiple consecutive delim chars?

Parsing an array using IFS with non-whites space values creates empty elements. Even using tr -s to shrink multiple delims to a single delim isn't enough. An example may explain the issue more ...
5
votes
1answer
4k views

Appending text to end of a textfile

How can I append a new line to a text file followed by current date and time?
5
votes
2answers
4k views

Invoking pushd in a shell script

I have a simple script that I want to invoke 'pushed' followed by another command. But the 'pushd' command inside the script doesn't seem to stick past the script. What's a way to make this execute ...
5
votes
2answers
860 views

What's up with this 'gnome' package?

I have recently grown tired of the way Rhythmbox starts up every time I plug in my MP3 player. I know I could simply disable this, but I've decided to uninstall Rhythmbox instead. It's such a ...
5
votes
2answers
1k views

ZONE_NORMAL and it's association with Kernel/User-pages?

Above is presented a case where I have only 512 MB of physical memory. What I have read up so far, is that ZONE_NORMAL is mapped to the kernel virtual address space as shown. Essentially I have a ...
5
votes
1answer
873 views

`p` key doesn't work in X

Today I had to force-shutdown my machine after it froze during resume from suspend. Since the reboot, I've found that the p key doesn't work normally in X. It does work normally in the console. ...
5
votes
2answers
2k views

Disk space on Fedora 12

I'm using Fedora 12 on my laptop. I have 10GB disk space and 2GB of them are free. After 2-3 days uptime the space ends and I must reboot. After rebooting I get 2GB free space back. How can I prevent ...
5
votes
2answers
225 views

How can I display the time when a command was executed in my bash prompt?

Currently my bash prompt looks like this $ echo $PS1 # \[\e[34m\][\t]\[\e[0m\] \[\e]0;\w\a\]\[\e[34m\]\u@\h: \[\e[34m\]\w\[\e[0m\]\n$ $ The problem is that \t will only display the time when the ...
5
votes
1answer
2k views

Printing (saving) the last bash input command

How can I get the last executed command from bash? I know that !!:p prints the last command, but it seems I can't use that anywhere except the bash prompt. I tried echo !!:p but it prints ...
5
votes
2answers
957 views

Why is my hostname different in Emacs?

So I changed the name of my computer recently, by editing /etc/hostname. The bash prompt is user@name, so I know it has worked. But in emacs, in the window bar it says emacs@name.tiscali.co.uk. ...
5
votes
4answers
3k views

How do I install GCC on a system with no compiler?

I've been messing around with my NAS which runs on Linux. I have root access, but there is no compiler. I seem to remember something about being able to compile on another system, but I'm not certain. ...
5
votes
2answers
2k views

GNU screen - Restore a session with splitted screen

When I restore a splitted session of screen, I've got only one print session and have to reconfigure the number of display session. Is there another way to have the original screen configuration?
4
votes
4answers
262 views

files greater than a average size of directory?

how could I find all the files and directories with size larger than or equal to the average file size of the current directory?
4
votes
2answers
64 views

BSD sed: Replace only the Nth occurrence of a pattern

Using BSD sed; How can I perform the following substitution?: Before: hello hello hello hello hello hello After: hello world hello hello hello hello In other words; how can I replace only the ...
4
votes
4answers
111 views

Extracting strings from between special characters

I have a large text file created from combining lots of html files. cat *.html > all_html_files.txt Inside the text file are specfic strings that I want to extract to another text file. For ...
4
votes
1answer
34 views

How to list all currently available compose key combinations?

Is there some way to inspect the state of X to get exactly and only a list of compose key shortcuts and what they map to, either as literal keys, for example: aa å 88 ∞ or as glyph names, for ...
4
votes
2answers
251 views

Set the bash display [while using GNU Screen utility] to not show the vim text after exit

Currently when I am not using screen utility, I am able to see the VIM content wiped out of the display when I quit VIM. However when I am using GNU Screen utility and opening a file in one of the ...
4
votes
1answer
93 views

NFS umount fails to find directory in /proc/mounts

When mounting an NFS share manually using mount and a path of the form <domain/ip>:<path>/<path> or <domain/ip>:/<path>/<path>, umount fails to find the path in ...
4
votes
5answers
231 views

Bash - PS1 not Updating With Proper Hostname after Hostname Change in Script

This is a copy of my post from stackoverflow; I realize I should have asked it here... I want to run a script that changes the hostname and have my bash prompt (PS1 variable) update immediately with ...
4
votes
1answer
71 views

Printing more than one field

Is there a way to print multiple fields with a single line command? I want to print $3 to $NF, I can do it like below: awk -F[:] '{print $3,$4,$5 .... $NF}' Yet it is not doable with large ...
4
votes
2answers
48 views

Tar is currently reading a 2GB file, and I deleted its only link. How do I stop it from running for an eternity?

Some more information: I was backing up a large directory with tar, only there were a couple of large files there that I didn't expect. This connection is over the network and very slow, so simply ...
4
votes
3answers
314 views

Bash - Functions in Shell Variables

I am reading this post on using functions in bash shell variables. I observe that to use shell functions, one has to export them and execute them in a child shell as follows: $ export foo='() { echo ...
4
votes
1answer
180 views

Debian stretch asks for root password in order to mount usb disks after upgrade

After apt-get upgrade && apt-get dist-upgrade, Debian Stretch started to ask for root password for external usb disks. Creating a /etc/polkit-1/localauthority/50-local.d/55-usb-mount.pkla ...
4
votes
3answers
132 views

How to append data to buffer in shell script?

I'd like to do following using shell script: (for simplicity, I use same data for INPUT. In real case, the data changes with loop label jj) #!/bin/sh for jj in `seq 100`; do cat INPUT.file ...
4
votes
0answers
128 views

allow regular users to use network namespaces

I have an architecture using network namespaces (netns). I would like to allow regular users to do some operations in these netns. I could write a script netns-exec.sh, inspired by this post, ...
4
votes
1answer
287 views

how to start a systemd service before networking starts?

I'm trying to set up a new service (under Debian Jessie) that needs to set up some mounts where the network configuration is stored and thus this service must complete before networking.service ...
4
votes
1answer
42 views

Prevent debian from hindering boot if a software-raid problem exists

I have a computer that I rarely have physical access to. All my access to that computer is done using SSH. On that computer, there's a software RAID5 using MDADM. This array contains data in one ...
4
votes
1answer
83 views

How to use awk to indent a source file based on simple rules?

How can I indent source code based on a couple of simple rules? As an example, I've used sed and ask to transform a selenium HTML source table to the following rspec like code. How could I ...
4
votes
1answer
2k views

SSE2 requirement for John The Ripper

I have a kinda problem about john in Kali x86. To make long story short, I can't allow to run john under Kali Linux 2.0 installed into LV, but as I remember I was able to run in older Kali and older ...
4
votes
2answers
212 views

How can I use Linux as a Gateway?

NOTE: If client devices (computer B in this example) want to obtain internet through the gateway computer, maybe they still need to configure nameserver resolution. This is not explained here ...
4
votes
5answers
341 views

How do I *reliably* and *simply* get the current shell interpreter name?

I'm looking for a simple and reliable way to get the name of the current shell from inside a script or a sourced file (not from the command line). I would have expected to just do $(basename ...
4
votes
1answer
233 views

Any problem assigning one variable to another in shell without using quotes? [duplicate]

This question is about assigning the entire contents of one variable to another variable. Variable is not being used (sent to echo, etc.) No parameter expansion is being done during the assignment. ...
4
votes
1answer
1k views

Scaling the desktop - kde

I've just installed OpenSuse 13.2 on my xps13. The resolution is a whopping 3200 x 1800. Which causes the text to come up tiny... Any way for me to scale this without having to lower the resolution ...
4
votes
2answers
633 views

How to permanently disable root-password prompt for recovery mode, RHEL7

Note: I asked a similar quesiton concerning version 6 of these bundles here. Note that 7 uses systemd and may have a different implementation In the rare cases that a RHEL or CentOS 7 system is ...
4
votes
1answer
268 views

“Xterm” or “xterm” in configuration file

After starting to use Arch I switched to xterm and urxvt terminal and enjoyed the flexibility of them (esp. scaleHeight resource). However, I don't understand why sometimes configs work with Xterm and ...

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