4
votes
2answers
121 views

Why do I see different versions of bash history for the same user

I ssh into my servers using root. Sometimes when I scroll back in my history, I see a history from an earlier session, but not the last session. Why does this happen with the same user account? Is ...
4
votes
2answers
3k views

Overwriting line in unix shell after printing

How can I modify a line after printing it in unix shell.We can delete the line and write again by using \r as shown below,but how can I overwrite on existing line and not delete it completely and get ...
3
votes
5answers
7k views

vlookup function in unix

How to make something similar to Excel's vlookup function in Unix? excerpt from office website, VLOOKUP The V in VLOOKUP stands for vertical. Use VLOOKUP instead of HLOOKUP when your comparison ...
1
vote
1answer
140 views

Unstable network on integrated Debian environment

Good afternoon, I recently installed Debian Wheezy (7.0) on a freescale board (SABRE MCIMX6Q / iMX6Q) and discovered some disturbing lags for all network communications. What I have tried so far was ...
3
votes
4answers
789 views

How to get a previous date using a reference to a file with the date command?

I'm trying to get Previous date of reference file. What I've tried : [rahul@testsrv]$ date +%F -r /tmp/ftpbkp.log 2013-08-27 [rahul@testsrv]$ date +%F -r /tmp/ftpbkp.log -d "1 day ago" date: the ...
2
votes
1answer
560 views

Solaris 11 and syslog over TLS

Does Oracle support support remote syslog over TLS/SSL on Solaris 11? I found it can be done with rsyslog, but is rsyslog default on Solaris 11 and if rsyslog is not default, does Oracle support a ...
2
votes
1answer
2k views

How enable watchdog?

I'm struggling with the watchdog timer (wdt) for a while. I can't get it working. My microcontroller is a AriaG25, based on the AT91SAM925. I have used this tutorial to compile the kernel. The ...
0
votes
2answers
798 views

Should I change SSD?

Demsg shows this EXT4-fs error (device sda1): ext4_ext_get_blocks: inode #7743113: (comm flush-8:0) bad extent address iblock: 3503, depth: 1 pblock 0 EXT4-fs (sda1): delayed block allocation failed ...
1
vote
3answers
20k views

need to move files to different folder based on the creation date [duplicate]

I have set of files created from Monday to Friday.. a -- > 08/20 a1---> 08/21 a2---> 08/21 a3---> 08/21 a4---> 08/22 a5 --> 08/23 I need to move only 08/21 file to diffrenet ...
1
vote
1answer
938 views

RHEL - permanently unmask all sub-folders and files

I'm new to RHEL, and I'm having issues unmasking a collections of directories. I have a folder where content will be generated content from a python script. The subfolders will exists for a period ...
1
vote
1answer
96 views

how to look the value of thedata by lookup index? [duplicate]

I have list of data array which I want to look the values by its index (id) and store to the index id from the data array. I can do it in spreadsheet VALUE LOOKUP function, but I still have lots of ...
2
votes
2answers
629 views

ssh reverse tunneling not working

So, I have a server and a home machine. My server can't talk to internet, but my home machine can. So, I set up a reverse tunnel through home to server using: ssh -R 9001:www.google.com:80 server ...
0
votes
1answer
554 views

How to get switch MAC address if it's a layer2 one?

arp -a doesn't show it. How can I get the MAC of it then? (on ex.: from a Linux)
2
votes
2answers
5k views

Extract substring from 'list' of strings

I have a file with lines with IDs, and I'm extracting certain substrings from each line. I've seen this answer, which is great, but I don't know how to get it to execute on each line. I figure xargs ...
2
votes
1answer
690 views

How can I custom rename podcasts after downloading them with gPodder?

I'm using Arch Linux. To download podcasts, I use gPodder 3. To listen to my podcasts, I'm using Rockbox on my iPod Classic. The thing is, the podcasts don't get sorted nicely on my iPod: ...
0
votes
1answer
110 views

Errors when booting with encrypted LVM

When I boot my computer and I have to enter the password of the encrypted lvm, there are always a bunch of annyoing messages like: "usb string descriptor 0 read error: -22". How can I fix that? my ...
12
votes
5answers
5k views

Using grep or awk

To capture a particular pattern, awk and grep can be used. Why should we use one over the other. How does this work in the background? Which is faster and why? E.g If I had a log file and I wanted ...
0
votes
1answer
100 views

init 0 process is not starting

Yesterday I have encountered one problem, when I turn on my PC it took a long time to boot. After booting it reached to command line with <initramfs> (It is unknown to me what it is) I thought ...
15
votes
1answer
12k views

How do you use output redirection in combination with here-documents and cat?

Let's say I have a script that I want to pipe to another command or redirect to a file (piping to sh for the examples). Assume that I'm using bash. I could do it using echo: echo "touch somefile ...
1
vote
2answers
612 views

how to multiply column of one file by column of anothe file?

I want your help in multiplying columns of one file by column of other another file where both files have the same number of columns and rows. I want the script to multiply the first column of the ...
20
votes
4answers
6k views

What happens if you edit a script during execution?

I have a general question, which might be a result of misunderstanding of how processes are handled in Linux. For my purposes I am going to define a 'script' as a snippet of bash code saved to a text ...
1
vote
1answer
367 views

How do I modify this Perl solution so that it will substitute embedded double quotes with single quotes?

Previously in this question: "string having doublequotes in between apart from the enclosing quotes" @BernieReiter asked a follow-up question where he wanted to take CSV entries such as the following: ...
5
votes
2answers
8k views

bash ${VAR//search/replace} and weird regex behaviour

I am trying to do some searching and replacing on a variable using the ${VAR//search/replace} parameter expansion. I have a pretty long and evil PS1, that I want to work out the size of after ...
1
vote
2answers
2k views

How do I send text to a USB device?

I'm trying to get the "Torobot" USB servo controller to work with Angstrom on a Beagle Board XM. The servo controller registers as a USB device. The device just takes simple text commands, but there ...
3
votes
1answer
3k views

Execute command supplied by function parameters

I'm trying to create a function method in a bash script that executes a command which is supplied to the method by the paramters. Meaning somethings like this: special_execute() { # Some code ...
3
votes
5answers
390 views

Comparing Indices of two strings

I have two double quoted strings of same length, that look like this: "$con" - (consists of spaces and *'s): * ****** *** ** * ** and "$...
3
votes
2answers
844 views

Enable Bash-Completion to expand Superuser executables to full path

I'm running OpenSUSE 12.3 (and have seen the behavior since 11), and have found that I can't call Superuser programs (e.g. shutdown, reboot) without using the full path. For me, many of these ...
2
votes
3answers
1k views

sed - find string and append

Suppose you have the following text file 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 ...
-1
votes
1answer
256 views

How to clear environment variables in launchd?

Currently, I have this bash script: #!/bin/bash function clear_secrets { export bob="" export john="" } clear_secrets And I want this bash script to run every 1 minute through launchd. However, ...
12
votes
3answers
55k views

Concatenating two variables with an underscore

I need to concatenate two variables to create a filename that has an underscore. Lets call my variables $FILENAME and $EXTENSION where filename is read from a file. FILENAME=Hello EXTENSION=WORLD.txt ...
4
votes
1answer
1k views

Eclipse not executable

I have just downloaded the Android SDK for Linux. I am running OpenSuse 12.3. When I try to run Eclipse, there is an error that says that there is no program to run executable files. So, I use the ...
2
votes
0answers
25 views

Route a particular process over another gateway [duplicate]

I have 2 internet connections on differnet interfaces. I have eth0 which is internal ip of 192.168.1.70 and then I have another network connection to a different network which is on wlan0 192.168.43....
1
vote
2answers
169 views

Backing up a large file

I have a test running which crashes. I need to find out how far it reached before crashing. It will restart again after crashing and wipe the log file. This wiping takes 10 minutes though. So If I'm ...
1
vote
2answers
487 views

mount tmpfs preserve current permissions

I have a directory of a web application cache and this has the permissions 755 (default), and I configured setfacl additional permissions. the problem is that when I restart the system, the ...
7
votes
5answers
21k views

Ubuntu 13.04 does not recognize USB drive

Using Ubuntu 13.04 (with Gnome 3), my new USB stick (details see dmesg/lsusb) doesn't show up automatically. Situation: The drive does not show up at fdisk -l The drive does appear when running ...
5
votes
1answer
278 views

Monitor a process in Debian

I want to create a service that monitors the existence of a certain process. I wrote the following shell script: #!/bin/sh while : do w=`ps u -A | grep -P ".+Sl.+/usr/local/MySource/endpoint" -c` ...
7
votes
1answer
292 views

Can you change a dynamic link target without recompiling?

I downloaded a program that unfortunately doesn't come as a source distribution. When I go to run it, I get the error error while loading shared libraries: libjpeg.so.62: cannot open shared object ...
0
votes
1answer
596 views

Installing VirtualBox Guest Additions on Ubuntu Server 10.04

I am trying to install Guest Additions on my Ubuntu 10.04 VM running out of Virtual Box. The problem starts when the instructions call for some menu feature that I cannot find, specifically: Go ...
1
vote
2answers
2k views

Hugepages in linux - how to make sure that java process will start using hugepages

I'm running java server on Red Hat Enterprise Linux Server release 5.9. Recently I started to use HugePages as it has some advantages I would like to use. System was configured correctly (as many ...
5
votes
2answers
3k views

Why do hard links seem to take the same space as the originals?

Thanks to some good Q&A around here and this page, I now understand links. I see hard links refer the same inode by a different name, and copies are different "nodes, with different names. Plus ...
2
votes
3answers
1k views

Color scheme is lost on shell change

My default login shell is ksh which shows my default color scheme which I set via putty. But when I change my shell to bash my color scheme is lost. Is there a way to retain the color scheme? EDIT: ...
3
votes
4answers
3k views

Scope of variables when calling function from find

In a bash script I define a function that is called from find. The problem is that the scope of variables does not extend to the function. How do I access variables from the function? Here is an ...
1
vote
2answers
401 views

Which embedded Linux platform supports Suspend to RAM?

I am trying to save maximum energy for a certain embedded Linux application. Currently I am using Raspberry Pi. But it looks like Raspberry Pi doesn't support Suspend to RAM. What alternative embedded ...
1
vote
2answers
305 views

Installer packages: .bin, -rpm.bin, tar, tar.z

Is it correct that most of Unix&Linux software supports x-copy deployment? If I download the installation package and uncompress the files into a particular directory - would that be enough to ...
6
votes
1answer
2k views

Can VirtualBox return IP address for launched VM?

I would like to start my VM from the command line and without the GUI using the following command: VBoxManage startvm <MY_VM> --type headless and the SSH into it from the next prompt. The ...
2
votes
1answer
99 views

Monitoring file reads for cache warming

After adding more memory to my Linux machine I was tempted to use the cache more agressively. The thing is: I boot up my machine, go to bathroom, come back and log in. It takes like half a minute to ...
2
votes
2answers
4k views

How to generate signal interrupt on a file descriptor in Linux?

How can I generate a signal interrupt on a file descriptor in Linux? Motivation is to generate a interrupt in userland as we have in microcontrollers. I'll have file descriptor for I/O, and want to ...
13
votes
2answers
4k views

Is there an easy way to “restart” a tmux pane?

Assume I have a tmux (1.7) window split as follows: ________________________ | 1 | | | |-----------+------------| | 2 | 3 | |___________|...
0
votes
1answer
896 views

Mobile Broadband disconnects as soon as connected - Crunchbang

For months now my mobile broadband (GSM) stick has worked with Crunchbang. Yesterday it stopped. When I plug it in, it appears in the network manager and I can connect to it, but as soon as it is ...
1
vote
2answers
171 views

Find or create kernel configuration of kernel binary

I've downloaded a kernel binary which I am using now. In order to use the watchdog on my system I must recompile the kernel with watchdog support. Is it possible to obtain the current kernel ...

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