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  • Limiting memory usage and mimimizing swap thrashing on Unix / Linux

    - by camelccc
    I have a few machines that I machine that I use for running large numbers of jobs where I try to limit the number of jobs so as not to exceed the available RAM of the machine. Occasionally I mis-estimate how much memory some of the jobs will take, and the machine starts thrashing the swap file. I resolve this by sending the kill -s STOP to one of the jobs so that it can get swapped out. Does anyone know of a utility that will monitor a server for processes by a specific name, and then pause the one with the smallest memory footprint is the total memory consumption reaches a desired threshold so that the larger ones can run and complete with a minimum of swap file thrashing? Paused processes then need to be resumed once some existing processes have completed.

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  • Utility to record IO statistics (random/sequential, block sizes, read/write ratio) in Unix

    - by Michael Pearson
    As part of provisioning our new server (see other SF) I'd like to find out the following: ratio of random to sequential reads & writes amount of data read & written at a time (pref in histogram form) I can already figure out our reads/writes on a per-operation and overall data level using iostat & dstat, but I'd like to know more. For example, I'd like to know that we're mostly random 16kb reads, or a lot of sequential 64kb reads with random writes. We're (currently) on an Ubuntu 10.04 VM. Is there a utility that I can run that will record and present this information for me?

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  • Unix: Search for file contents

    - by Svish
    I find the find . -name "some-file" command very useful to list all files matching some file name in a folder. Is there anything similar I can use to list all files that contains string? If you needed to find all files in a directory that had a certain string of text in it, what would you use?

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  • Exclude all hidden directories in UNIX find

    - by xRickerlx
    I'm doing a word search using the following command: find . -exec grep -q [some_word] '{}' \; -print -o -name .svn -prune -o -name .ssh -prune -o -name .boneyard -o -name log -prune -prune -o -name tmp -prune Is it possible to use a regex to exclude all hidden directories? Note: The current command traverses the entire tree from the current location and exclude those being pruned. The exclusion needs to work for any hidden directory regardless off location.

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  • How to Practice Unix Programming in C?

    - by danben
    After five years of professional Java (and to a lesser extent, Python) programming and slowly feeling my CS education slip away, I decided I wanted to broaden my horizons / general usefulness to the world and do something that feels more (to me) like I really have an influence over the machine. I chose to learn C and Unix programming since I feel like that is where many of the most interesting problems are. My end goal is to be able to do this professionally, if for no other reason than the fact that I have to spend 40-50 hours per week on work that pays the bills, so it may as well also be the type of coding I want to get better at. Of course, you don't get hired to do things you haven't dont before, so for now I am ramping up on my own. To this end, I started with K&R, which was a great resource in part due to the exercises spread throughout each chapter. After that I moved on to Computer Systems: A Programmer's Perspective, followed by ten chapters of Advanced Programming in the Unix Environment. When I am done with this book, I will read Unix Network Programming. What I'm missing in the Stevens books is the lack of programming problems; they mainly document functionality and provide examples, with a few end-of-chapter questions following. I feel that I would benefit much more from being challenged to use the knowledge in each chapter ala K&R. I could write some test program for each function, but this is a less desirable method as (1) I would probably be less motivated than if I were rising to some external challenge, and (2) I will naturally only think to use the function in the ways that have already occurred to me. So, I'd like to get some recommendations on how to practice. Obviously, my first choice would be to find some resource that has Unix programming challenges. I have also considered finding and attempting to contribute to some open source C project, but this is a bit daunting as there would be some overhead in learning to use the software, then learning the codebase. The only open-source C project I can think of that I use regularly is Python, and I'm not sure how easy that would be to get started on. That said, I'm open to all kinds of suggestions as there are likely things I haven't even thought of.

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  • edit files in unix

    - by Niklas
    Hi, I started to work in unix for couple of weeks ago and can very little about unix. Everytime I edit a file, a temp file~ appears in the filesystem. What does this mean? Can I just remove all these files? What can I do for removing these files automaticaly everytime I close the original file? /Niklas

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  • UNIX timestamp always in GMT?

    - by bn
    UNIX timestamp always in GMT? I tried to run php function time() and when I tried to convert the unix timestamp from the time() function, the output is not similar to the computer time. Thank You

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  • Python datetime to Unix timestamp

    - by Off Rhoden
    I have to create an "Expires" value 5 minutes in the future, but I have to supply it in UNIX Timestamp format. I have this so far, but it seems like a hack. def expires(): '''return a UNIX style timestamp representing 5 minutes from now''' epoch = datetime.datetime(1970, 1, 1) seconds_in_a_day = 60 * 60 * 24 five_minutes = datetime.timedelta(seconds=5*60) five_minutes_from_now = datetime.datetime.now() + five_minutes since_epoch = five_minutes_from_now - epoch return since_epoch.days * seconds_in_a_day + since_epoch.seconds Is there a module or function that does the timestamp conversion for me?

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  • UNIX Executable File

    - by iSight
    Hi, I got some file sample.mt from client, and when i open info, it reveals as UNIX Executable file. But, actually when i replaced the extension with zip, i could extract the file content. And it appears to be folder. Can any one say what exactly UNIX Executable file means and how is it created. By the way, that is created in Windows OS it seems.

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  • Is there a java library equivalent to `file` command in unix

    - by Shervin
    Is there any java libraries that is similar to unix's command file? ie: $ file somepicture.png somepicture.png PNG image, 805 x 292, 8-bit/color RGB, non-interlaced The file command is such a nice tool. I need something that can tell me if the file is really what I want it to be. (ie a picture, document etc) I know I can run the command file, but I am looking for a java library, not running the actual unix command.

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  • PHP - Accurate Unix timestamp periods without MySql

    - by Wonka
    I'm trying to have an accurate Unix timestamp values for: today, this week, this month, this year There are a few snags however: - Today should be everything since last midnight - This week should start on the last/this monday - This month (should know if its 30/31 days or 28/29 days feb) - This should be the very beginning of the current year up til now I want to do this without mysql at all, purely in php as I need it as an accurate Unix timestamp to assign to a variable. Any Idea how these timestamps periods can be calculated?

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  • Is there a way to prevent output from backgrounded tasks from covering the command line in a shell?

    - by Chris Pick
    I would like to be able to run task(s) in the background of a shell and not have their output to stdout or stderr cover the command line at the bottom. Frequently I need to run other commands to interact with the background processes and would like to do so from the same shell without having to open up another terminal or using multiplexer to split the terminal like screen. Ideally there would be some setting that I just don't know about (I commonly use bash or ksh), but a new or different shell or a script would be fine by me. I'm open to any suggestions and appreciate any help, thanks.

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  • Send and recieve multiple ssh commands via java runtime and cygwin

    - by Moustachio
    Hey I have run into the following problem when attempting to build a program in java which executes commands on a remote linux server and returns the output for processing... Basically I have installed Cygwin with an SSH client and want to do the following: Open Cygwin, Send command "user@ip"; Return output; Send command "password"; Return output; Send multiple other commands, Return output; ...etc... So far: Process proc = Runtime.getRuntime().exec("C:/Power Apps/Cygwin/Cygwin.bat"); Works nicely except I am at a loss as to how to attempt the next steps. Any help?

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  • Commands to run programs using .NET

    - by Arjun Vasudevan
    In case I have .NET framework installed in my computer + all the necessary other language support(Perl Interpreter etc) What are the commands I should give in the console to run programs in the following languages: 1. C 2. C++ 3. Java 4. Python 5. VB 6. C# 7. Perl 8. Ruby Like we have for VB- vbc .vb, what are the commands to run other languages?

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  • remotely running find -exec options

    - by Michael Merchant
    I'm trying to setup a bash process for deploying my django project onto a linux server. Through cygwin, I'm running a script that is calling scp to copy my files over. Is there a similar command to delete *.pyc files. As of now, I've only been able to accomplish this locally after using ssh with: find . -name "*.pyc" -exec rm -rf {} \; I'm looking for some kind of command to call remotely that would be equivalent.

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  • unix career in programming

    - by mnunna
    I am currently working on a HP-UX platform and my role as a prod support team member involves mostly to write shell scripts. But I want to branch out into core systems programming in unix. A quick search on the internet threw no "unix systems programming jobs" in my area. I'm confused as what to do. I really would like to continue with unix as my core competency, but unix jobs are mostly of sys admin/ prod support type, of which I do not want a part of. Can anyone of you give me an informed advice on the career oppurtinities that await unix professionals?? Any advice would be appreciated.

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  • unix `tee` - chain of commands

    - by Mike
    In a unix environment, I want to use tee on a chain of commands like so $ echo 1; echo 2 | tee file 1 2 $ cat file 2 Why does file only end up as having the output from the final command? For the purpopses of this discussion, let's assume I can't break them apart and run the commands seperately.

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  • Track "commands" send to WPF window by touchpad (Bamboo)

    - by Christian
    Hi, I just bought a touchpad wich allows drawing and using multitouch. The api is not supported fully by windows 7, so I have to rely on the build in config dialog. The basic features are working, so if I draw something in my WPF tool, and use both fingers to do a right click, I can e.g. change the color. What I want to do now is assign other functions to special features in WPF. Does anybody know how to find out in what way the pad communicates with the app? It works e.g. in Firefox to scroll, like it should (shown on this photo). But I do not know how to hookup the scroll event, I tried a Scrollviewer (which ignores my scroll attempts) and I also hooked up an event with the keypressed, but it does not fire (I assume the pad does not "press a key" but somehow sends the "scroll" command direclty. How can I catch that command in WPF? Thanks a lot, Chris [EDIT] I got the scroll to work, but only up and down, not left and right. It was just a stupid "listbox in scrollviewer" mistake. But still not sure about commands like ZOOM in (which is working even in paint).. Which API contains such things? [EDIT2] Funny, the zoom works in Firefox, the horizontal scrolling does not. But, in paint, the horizontal scrolling works... [EDIT 3] Just asked in the wacom forum, lets see about vendor support reaction time... http://forum.wacom.eu/viewtopic.php?f=4&t=1939 Here is a picture of the config surface to get the idea what I am talking about: (Bamboo settings, I try to catch these commands in WPF)

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  • Getting the uptime of a SunOS UNIX box in seconds only

    - by JF
    How do I determine the uptime on a SunOS UNIX box in seconds only? On Linux, I could simply cat /proc/uptime & take the first argument: cat /proc/uptime | awk '{print $1}' I'm trying to do the same on a SunOS UNIX box, but there is no /proc/uptime. There is an uptime command which presents the following output: $ uptime 12:13pm up 227 day(s), 15:14, 1 user, load average: 0.05, 0.05, 0.05 I don't really want to have to write code to convert the date into seconds only & I'm sure someone must have had this requirement before but I have been unable to find anything on the internet. Can anyone tell me how to get the uptime in just seconds? TIA

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