Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs.

learn more… | top users | synonyms

-1
votes
1answer
13 views

Parallel data to file

this question is about catching printer data and writing it in a file. We use an old Unix system which is unfortunately crucial. This Unix system uses a matrix printer. This printer seems to get its ...
0
votes
0answers
29 views

Get growl notifications from within a unix screen which is not in focus from a remote SSH session

Using iTerm2 I have growl notifications working within a (unix) screen session on remote servers when that window has screen's focus: My server's ~/.bashrc has: growl() { local ...
0
votes
1answer
85 views

Fedora17: yum update not working

I am new to linux environment and I have been assigned the task of installing a browser in my system (which I feel a really tough work in linux as a first time user). When I am trying to run the ...
0
votes
1answer
31 views

Shell Command that Combines chmod and chgrp

Is there a combined variant for chmod and chgrp that sets both user and groups permissions in one single system call for each file? This is useful for increasing performance on slow data layers such ...
0
votes
2answers
59 views

How to delete half of the files in a directory?

A directory has files with names ending 001 to 100. How can you delete 2,4,6,8...100. And can that be written as a script. As soon as the directory becomes week old, this has to run. And after a month ...
0
votes
1answer
30 views

how to mass convert .xml files in a directory to UTF-8 while retaining the same filename

I have many .xml files that are encoded in ISO-8859-1, and I want them all in UTF-8. I figured out the code to convert them individually which is : iconv -f ISO-8859-1 -t UTF-8 filename.xml > ...
1
vote
1answer
27 views

Unix2Dos: can't stat - what does this mean, why does it happen?

I've got a txt file that has Unix newlines and needs to have Windows newlines. I try to do unix2dos filename.txt but I get Unix2Dos: Can't stat 'filename.txt'. In fact, it says Can't stat 'xxx' for ...
1
vote
0answers
25 views

Edit bootable img file on mac OSx

I have downloaded a bootable image of ubuntu (7.95Gb .img file) for a Parallella (minicomputer), but its too big to fit on my 8 Gb micro sd card (which actually is only 7.8 Gb!). I would like to ...
0
votes
2answers
65 views

Is it possible to install OS Windows 8.1, Windows 7, Windows Server 2012, Oracle Linux, Oracle Solaris, Fedora Linux?

I'm planning to have 6 operating systems in my laptop. And wanted to have more in the future. I want to install 2 versions of desktop OS in windows (7 and 8.1) and a server OS in windows (Windows ...
1
vote
0answers
37 views

In the Terminal is there a way to search for a command you previously entered? [duplicate]

In the Terminal is there a way to search for a command you previously entered? Say you typed something in just a moment ago, you can press the up arrow. But if you typed it in hours ago, or a day ...
0
votes
1answer
13 views

in Unix reading a beginning of a filename and inserting it to another file

Could anybody tell me what is the best way to copy fragment of a filename, for example axheMyfile.txt, read first 4 unique letters and copy that to a new tabdelimited file to be merged with another ...
0
votes
0answers
8 views

Unix environment variables for Unix-derived apps in Windows

My problem is that cross-platform apps initially written for Unix/GNU+Linux trash my Windows filesystem by placing files wherever they can. In most cases this can be solved by setting environment ...
0
votes
1answer
21 views

How do I make less open binary files without confirmation?

I have several log files that contain a few bytes which are not displayable characters (due to binary signatures on the requests). Every time I open them with less I get asked: $ less ...
0
votes
0answers
29 views

Installing APK's through mobile terminal ide?

I was wondering if you could manually install apks that are downloaded onto the SD card of my android tablet. I'm looking for something similar to the sideload command when connected to a computer. I ...
1
vote
2answers
47 views

Compare two files and output the differences

I am aware of diff and using loops but I just cant seem to really get what I need with diff. I'm basically looking to compare two files (file2.txt and file2.txt) and just get the output of what is ...
2
votes
2answers
41 views

How to find the common paths from a list of paths/files

Prelude: Given a sorted input of a list of paths/files, how to find their common paths? Translating into tech term, if feeding the sorted input from stdin, how to pick the shortest proper prefix ...
0
votes
1answer
29 views

including timestamp in file name

I tried to create a file like this to put a timestamp in the file name vim Customer1-$(date).txt The result was Customer1-Sat.txt, however, I wanted the full timestamp Sat 30 Aug 2014 09:41:27 PDT ...
5
votes
4answers
301 views

Why does the root directory '/' have a reference to its “parent”?

I'm currently developing a fake filesystem for a browsergame. I recently implemented ".." and "." folders so every folder has a reference to its parent. Then I checked in my terminal if "/" also has ...
0
votes
0answers
48 views

ksh script using if break statements

I have a script file that has the server details like set -A SERVERGRPS SERVERS_CA SERVERS_NY set -A CA ca126 ca546 ca 642 set -A NY ny112 ny113 ny114 now I have to write a another script which ...
0
votes
1answer
30 views

Linux bash iterating and Break

I have two server groups SERVERS_CA AND SERVERS_NY. I will have a array something like SERVERGROUP=(CA NY) CA and NY will have set of servers in arrays like CA=(ca126 ca546 ca 642) NY=(ny112 ny113 ...
0
votes
1answer
71 views

Cannot change directory into home directory, although permissions are set correct

I guess I need some help from an advanced Unix user... On a Ubuntu System I did something stupid. I typed sudo chmod 774 .* or the like, in a subfolder of my home folder and then I suddenly could not ...
0
votes
1answer
44 views

Tar withour directory structure and exclude folders

I am trying to create a tar file to exclude certain folders and then I want to have a tar file without the parent directory structure. I am able to exclude folders, but when I extract I see path from ...
1
vote
1answer
322 views

boot2docker mount windows share

I am running boot2docker on windows and I am trying to access a shared folder on my host from the VM. I have executed the following sudo mkdir /mnt/docktest sudo mount -t cifs ...
2
votes
2answers
389 views

Copying folder from one Unix server to another, updating owners IDs

I'm using the method described here to copy a directory from one Unix server to another (both Ubuntu 14.04): rsync -aruv localfolder/ user@server:destination/ I need to keep the same owners and ...
0
votes
1answer
68 views

How can I get more information from Curl regarding a FTP 425 “Cannot open data connection” error?

I am trying to upload a file with the following line: curl -3 --ftp-pasv --ftp-ssl-control -v -i -T ./mybigfile.gz ftp://lawrence@mecloud.xxxxxxx.co.uk:21/OnlineBackup/Lawrence/ --insecure -u ...
0
votes
0answers
23 views

Unix Multi-Group Permissions

I am trying to do permissions to a folder for multiple groups, each will have different permissions to the directory. Can you let me know how to do this without editing the ACL's? Group 1 RW Group 2 ...
0
votes
0answers
16 views

Message queue doesn't exists any more after reboot/shutdown of the virtual machine (Ubuntu)

I'm working on a simple multithread client/server program in C using native message queue of unix to send messages from one client to another. It works fine, but my problem is that after a reboot or ...
0
votes
1answer
47 views

Memory usage of a process in a shell script

I want to find out the memory usage of a process in a shell script.I tried to use this piece of code : while[process] do if [ -e /proc/$pidno/statm ]; then m=`awk '{OFS="\t";print ...
0
votes
0answers
17 views

UNIX command tcpdump for certain filetypes like xml

I use the unix command tcpdump with these extensions -A -s0 -ien0 port 80 I know how to add, for example a new host, that would be and \ host random.com Can i sniff for certain filetypes? I have ...
1
vote
3answers
203 views

Creating a large file of random bytes quickly

I want to create a large file ~10G filled with zeros and random values. I have tried using: dd if=/dev/urandom of=10Gfile bs=5G count=10 it creates a file of about 2Gb and exits with a exit status ...
0
votes
1answer
30 views

What is the easiest way to convert a bunch of text files from LF (Unix) to CRLF (Windows) in a single run?

There is a directory tree on a Windows7 machine containing a few hundred text files that I want to convert from LF to CRLF. I already found a Win32 version of UNIX2DOS but that one accepts only one ...
0
votes
1answer
41 views

Iostat and top show static resource usage on first value

For one of my projects, I need to obtain resource (CPU, I/O and disk-space) usage programatically. Currently I'm running shell commands (iostat) and parsing the results which works relatively well ...
7
votes
1answer
283 views

Multiple unix pipes not working

This first pipeline works fine (printing "c"): echo "a" | sed 's/a/b/' | sed 's/b/c/' This one does not do what I expect (nothing gets printed when I feed an "a" into my fifo ): mkfifo fifo; cat ...
0
votes
0answers
42 views

Why isn't the loop back interface replying to injected ICMP echo request?

I want to be able to send IP packets from a userspace program and receive responses on a TUN interface. To test, I'm injecting ICMP icho requests to the loopback interface from a user space ...
0
votes
1answer
53 views

Unix BIOS/Boot Record on USB Flash Drive

I have been trying to learn a bit more about USB drives, and am curious about their MBRs. Essentially, I open up the device file of the USB drive and give a hex dump of the first 496 bytes of the ...
0
votes
2answers
51 views

Delete Directories that Contain Specified File in Mac OS X

How do I delete a folder that contains a file or folder with a specific name? E.g. I want to delete all folders that contain the file "things.txt": /dirA/ /dirB/things.txt /dirC/ /dirD/things.txt ...
0
votes
0answers
56 views

Using Tap/Tun to intercept packets at IP level

I am working on a research project involving ARP poisoning. I would like to intercept packets on the IP level. If my machine receives a packet with an IP address not destined to it's own IP ...
66
votes
6answers
3k views

Choosing between .bashrc, .profile, .bash_profile, etc [duplicate]

This is embarrassing, but after many years of using POSIX systems full time, I still have a hard time figuring out if a shell customization should go in .bashrc, .profile, or somewhere else. Not to ...
1
vote
2answers
63 views

How do I delay tcp traffic on a socket?

I would like to test the interactions between a client program and a server program for race conditions. They connect to each other via tcp. The client does blocking calls to the server on multiple ...
0
votes
0answers
44 views

0711-317 ERROR: Undefined symbol

I am installing a C package named expat-2.1.0 in AIX 6.1 machine. While performing a gmake it popping the below output. /bin/sh ./libtool --silent --mode=compile gcc -std=gnu99 -I./lib -I. -g -O2 ...
1
vote
1answer
48 views

how to create ubuntu installable iso image from files

this might be a quite silly question but I lack linux knowlege so here it is... I have an ubuntu VPS from which I need to create a development environment under my WMWare. So I wonder if the ...
0
votes
2answers
64 views

How to ignore a specific SMART error

I get an email about the same SMART error every day. I'd like to configure the SMART daemon to ignore this specific error, but only this, since I still want to now if anything changes or gets worse. ...
0
votes
0answers
26 views

How to get the status of VGA device

Currently I am using vga2usb device for capturing output from the virtually any VGA source such as tab or any another monitor. If I connect this vga2usb device to my Ubuntu machine then we are ...
3
votes
3answers
67 views

Sed replace only in even numbered lines of a file when replace commands are written in a file

I have all the replace commands in a file (say replace.sed) and i use it with -f flag of sed (sed -f replace.sed InputFile). But now i ran into a condition where i need to apply these replace rules ...
2
votes
1answer
201 views

wc / cat command not found

I'm trying to run some simple bash script which uses wc and cat commands. The script fails with this: wc: command not found or this (after I commented string which uses wc): cat: command not found ...
0
votes
0answers
124 views

Configuring Apache with PHP-FPM, Apache failed to start

I followed this guide to configure PHP-FPM with Apache on my server but after I restart Apache successfully: [root@localhost vhost]# service httpd restart Stopping httpd: ...
0
votes
1answer
81 views

tar -czvf with no output file

Say you run tar -czvf some_folder_here and don't actually specify an output file, like tar -czvf some_output_file.tar some_folder_here. Where does the file go? I just ran this by accident, and the ...
0
votes
1answer
80 views

Solaris 11.1 x86 installing Weblogic 12.11

Ive been looking everywhere for a way to install Weblogic on Solaris. According to Oracle's documentation, all you need to install Weblogic Graphical Mode is Login on Unix Go to the directory that ...
1
vote
2answers
45 views

Retrieve secure copy in UNIX?

Is there a way to retrieve a secure copy in UNIX? Why would I need to do this? Because I can login to a remote machine from my local machine, but not the other way around. So I need to retrieve a ...
-1
votes
1answer
39 views

how to retrieve following error when i execute shell script

I have one script to log into remote server.But i tried to Execute the script some error occur. Logs: My script: #!/bin/bash S1=$(ssh -t selvam-odc-shell1 "users | wc -w ") S2=$(ssh -t ...