Unix Definition and 41 Threads

Computation history is cluttered with variants, by-roads, successes and failures. I really like UNIX/C as an engineer and scientist but mainly use Windows for home computing. ##-## @Klystron

I'd like to rename a bunch of files in a directory based on data from a tab-delimited text file. I know how to do this in R: dir <- "~/user/folder/" fileNames <- read.table(paste0(dir,"fileNames.txt"),sep="\t",header=T) for (i in c(1:nrow(fileNames))){ oriFile <-...

Homework Statement Assignment instructions are as follows: For the purposes of this assignment, we've been provided with some skeleton code (the "myshell.c" program mentioned in the instructions). I'll post it here: #include <stdio.h> #include <sys/wait.h> #include <unistd.h> #include...

Homework Statement The assignment I'm doing involves manipulating an image stored in a 24-bit uncompressed BMP file. We were provided with two pre-written files (a header and a .c source file) that contain functions that read and write the image file, as well as a flip() function (mirrors the...

Homework Statement Write a C program to run on ocelot to find the total count of words and optionally the longest and or shortest words in a string input by the user or coming from a file. If there is no filename the user would be prompted to enter the string. You must use getopt to parse the...

Homework Statement I'm playing around in UNIX and I wanted to modify my .profile file in my home directory, but It's not there. I know you type in ls -a to view the hidden files but it's simply not there. Do I just create one? I want it to just display my name every time i log in. Homework...

Hi guys, I'm trying to use the CASTEP software for dft calculations. I have plenty of documentation on how to use it once it's all up and running, however I don't know how to get to that point :/ I'm not the best with linux but I've manually installed programs before through tarballs but here...

Homework Statement use awk to create a subset of the original data file called subset.gmt that only contains records with longitudes between -112 and -102. Hint: you can use the operator && to tell awk to look for more than one pattern at once. Homework EquationsThe Attempt at a Solution...

Warning: My terminology is horrendous in this area. Bare with me. In my Geophysics class we are being taught the very basics of Unix using 'Putting" and a program called Xming. We sign on to a server hosted by the profressor at school using designated usernames and passwords and we use...

I am using a makefile and the file is compiling without any errors. After compiling I try to execute the output file by typing ./output, but then the bash shell thing disappears and I can only type text but not give commands anymore. Anyone know what could be going on?

I have a climate modelling program that I need to somehow get to work. I have no experience with Unix whatsoever, so for me this is not a trivial task. I attached a screenshot of what I have. I need to compile the program and since there is a Makefile in my directory, I guess I have to use the...

I have an account on a Unix cluster where I log in through an SSH client (I'm using SecureCRT). I need to be able to transfer files from my windows to PC to my unix acount and vice versa, does anyone know how to go about doing that? There is a "Transfer" menu in the SecureCRT window but it...

Homework Statement Trying to find how many numbers contains 5 between 1 to 4321 Homework Equations n/a The Attempt at a Solution #!/bin/bash typeset -i current=1 typeset -i times=0 while [ $current -le 4321 ] ; do if [ ] ; then <<<<<<<<<<< stuck here, not sure what...

I would like to copy some code that I wrote in eclipse to vi text editor in unix without retyping the entire code. Is there a way to do this?

Hello guys, I am trying to query the file attributes in unix using a c program..Little help please :)

I want to basically have a dedicated machine for running scientific computation programs and be able to access it remotely anywhere using a laptop/netbook. That means I don’t care much about GUIs. I’m used to using Unix and am perfectly fine with doing everything through a command window. At the...

I am getting a confusing EOF error. I have working code which I have tested in Cygwin on Windows, but now that I am running the same code on Fedora Linux, I am getting an EOF error in a data file that I know works. Is there something I need to do in the transition from Windows to Linux to...

So, I'm majoring in Physics and I got an email from my adviser saying that "Intro to Unix" was one of the most helpful classes. They only offer them during 2 times. One is Tuesdays 5:15pm to 6:30pm while the other is online. I've dabbled in Linux distros and use them from time to time, so I'm...

How do I use a Unix-originated makefile on Windows Vista? Is there any simple guidelines for migrating the makefile such that it works?

UNIX “cat” command doubts! I’n new to UNIX so please bear with me. I wanted to know what does the cat file1.txt << file2.txt command do? it doesn’t give an error, just goes accepts the keyboard as stdinput, and on ctrl+d, contents of file1 nor file2 changes. Also one more thing in the...

hi! I am trying to create a script that will run a program, enter inputs (this program requires some inputs for it to run), and then send the output to a file. I am stuck on trying to get the script to enter in those inputs :( so far all i have is: ./program > file <input1> <input2>...

Hi, I was trying to type: mv *.txt some_other_directory but I accidentally hit 'return' after just typing: mv * Many of the .txt files in my current directory disappeared (but not all of them, strangely enough). Does anyone know what might have happened to them and how to undo the...

I'm trying to write what is basically a search and replace script. Full disclosure: This IS a homework assignment, and my attempt is below. It is supposed to have a usage statement, which I think is pretty solid so far. The problem is at the end where I do that actual searching and replacing...

Recently I've been reading up some, and in certain communities Linux and particularly Unix are very well accepted. I want to switch over to Linux or Unix or possibly have both on my system. Any suggestions on which versions to run? So far, I think I may settle on Red Hat because some of my...

Ok, I'm computer literate up to a certain limit... I was looking over the new features of os 10.5 on their website. I have no idea what UNIX is and if it goes well with tomato sauce, but it sounds important. http://www.apple.com/ca/macosx/features/300.html what does this all mean in...

I understand that you can put down UNIX as one of your skills acquired section, but can you put down LINUX as one?

I have never written a shell script, but I am trying to learn. I want to make a generic Unix shell script that will allow me to run four commands in a row... something like this... latex $filename bibtex $filename latex $filename latex $filename I would like to call the script...

So I'm using freopen to redirect output from stdout to a file... How do I redirect it back to the screen? relevant code: FILE *stream = freopen("data.txt", "w", stdout); /* print stuff */ How the heck do I get the output stream to point to the console again?

The goal would be to finally create a real competition to MS Windows. Since it can be anything, open source, closed source, do whatever on Earth you want, the competition would be great. You would get the best of both worlds, open and closed source. A company can decide to invest billions...

Hello Dudes, I m writing a C shell code in UNIX that takes a user command and executes it, my shell must support the redirection and piping too. Well i succeeded in writing the first one (takes a user command and executes it ) but i m stucked in the other parts :( Can anyone help ...

I did it the following way. The number of characters and lines are coming out fine, but the words are usually more than the actual given by wc. #include<stdio.h> int main() { FILE *fp; int words=0,chars=0,lines=0; char prev,curr; //prev variable is included to...

NEVER MIND! I finally found a good reference explaining all of this. Sorry for the wasted bandwidth! Patrick I have this makefile I am trying to understand. It goes like this: COMP = ifort FLAGS = -autodouble etc... GLOBALS = a bunch of .o files... glue...

Hi, I have a question about C programming. I am going to take a class of C programming and we are going to write the codes in a UNIX environment. Because I do not have access to a "SUN" computer, is there a possibility to have a compiler that permits me to write under Windows XP but can...

argh, this mac is making me miserable So, I want to convert some .dfont fonts to .ttf and installed fondu, which should do the work. Now, 1) how do I find out where the program got installed to, or is it supposed to disappear when it's unix based? 2) now when I type fondu in an X11 terminal...

I'm thinking about running unix as a virtual machine. What is a good distribution that I should start with? I was looking at FreeBSD. By the way I don't know if I'm confusing my terminology with unix, so is there a "unix" from the open group and are the others (FreeBSD, OpenBSD, etc.) just...

SOMEONE please tell me how to change my access to a folder to 755. I have WS-FTP Pro and I thought all you had to do was right click and select ftp commands however this is not an option for me

I just started a FORTRAN 90 programming class this quarter, and we do all our work on the school's UNIX servers, and I love it. The simplicity, no dealing with all the unnecessary crap windows comes attached with. I just felt like sharing.

Is there a way to look up the names of printers hooked up to a particular server? I'm trying to print some of my old homework assignments that I accessed using SSH. The OS is UNIX Sys. V.

I've become rather fond of MiKTeX's package management system. The last time I actually had to manually find a package on CTAN has been a long time ago, because of MiKTeX. Just wondering if anyone knows of a similar system for Unix systems?

I'm currently doing a research paper on Unix. I dotn have any experience with it or other operating systems like it. I need to find information about the following : 1. detailed description of the underlying theory and operation of the technology 2. a summary of competing technologies...

Hi guys, I have been trying to get familiar with the Unix environment.. there is just one (actually two) things that I cannot figure out. It must be a trivial question for you guys. How do I delete a file from a root directory without actually going there? How do I delete all the files...