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  • Network connection on Linux

    - by Kevin
    A general question about network connection on Linux : once a network connection goes into time_wait, is it still tied to the process ? Does it still use resources like say filehandle ? Reason I ask is because once it goes into time_wait, lsof does not report it anymore. I guess that means that the network connection is no longer tied to the process and hence does not count against filehandle limit. Would like to confirm though.

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  • Virtual Machine for software renting service

    - by Vilis
    I am currently trying to figure out which solution would be best for software renting service (with proper licensing and stuff). I know its kinda stupid and so on, but I just have to develop it. Long story short - user can connect to a virtual machine (with windows guest os) using vnc and use some specific software for some specific time (eg., 1 hour). I have already considered VirtualBox, Xen and some other, but maybe somebody has a better idea. Thanks.

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  • How to avoid duplicates when copying files that have been renamed at the destination

    - by Benoitt
    I have to get pictures from a folder – with subfolders which are updated automatically – with their extensions. These files have to be copied in a folder where a website based on PHP will edit them (by renaming and creating an XML file) to be downloadable and integrated in an XML feed. Because of the rename function of the script, when I perform the copy gain, all the files are duplicated, because the script has renamed the original ones already. I've tried a few things with rsync but I'm looking for something more powerful because I can't copy files with an external "history". #!/bin/bash find '/home/name/picture' -name '*.jpg' | while read FILE ; do rsync --backup --backup-dir=incremental --suffix=.old "$FILE" /var/www/media ; done wget --spider 'http://myscript.php' ; #exit 0 PS: As a little addition, I'd like to replace '.' with a 'space' just after the *.jpeg copy. My PHP script has some problem to define files with comma because of the extension. I'm finking about a command with find – like I did before – with a sed function? Is that a good idea?

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  • Persistent retrying resuming downloads with curl

    - by Svish
    I'm on a mac and have a list of files I would like to download from an ftp server. The connection is a bit buggy so I want it to retry and resume if connection is dropped. I know I can do this with wget, but unfortunately Mac OS X doesn't come with wget. I could install it, but to do that (unless I have missed something) I need to install XCode and MacPorts first, which I would like to avoid. Curl is available though it seems, but I don't know how that works or how to use it really. If I have a list of files in a text file (one full path per line, like ftp://user:pass@server/dir/file1) how can I use curl to download all those files? And can I get curl to never give up? Like, retry infinitely and resume downloads where it left off and such?

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  • Unable to sunchronize local and remote directories ("set times: Operation not permitted")

    - by Tom Auger
    I'm running into FTP errors using software like NetBeans or WinSCP: whenever I attempt to perform a synchronization or update of files from local -- server I get errors on the client saying "set times: Operation not permitted". This is clearly an issue with the way I've configured my Fedora installation. The user that I'm logging in with cannot touch -t any of these files, though he IS part of a group that has r/w access on the files. I do have root / sudo access to this server. What I would like to know is: a) is it likely that this problem would be solved by allowing my FTP user to "touch -t" these files b) how do I enable a certain user to be able to set timestamps on files without giving them ownership of the files (certain of these files need to be owned by Apache, for instance, so I don't want to chown them). Thanks in advance.

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  • Store system passwords with easy and secure access

    - by CodeShining
    I'm having to handle several VPS/services and I always set passwords to be different and random. What kind of storage do you suggest to keep these passwords safe and let me access them easily? These passwords are used for services like databases, webserver user and so on that run customers' services, so it's really important to keep them in a safe place and strong. I'm actually storing them in a google drive spreadsheet file, describing user, password, role, service. Do you know of better solutions? I'd like to keep them on a remote service to make sure I don't have to make backup copies (in case my hdd would fail somehow). I do work on *nix platforms (so windows specific solutions are not a choice here).

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  • Started an application through SSH, command line now gone, what happens next?

    - by Chris Dutrow
    Context: This is a very basic question Using Putty and SSH for the first time to do some serious server setup and run into the situation where I have started a process that I do not want to stop. The process is the gunicorn WSGI HTTP Server (running on Centos 6.3). The command I used to start the process is (as per their Quick Start): gunicorn -w 4 myapp:app At this point in the work session, I have lost the command prompt. This must be such a non-issue that it doesn't even enter into an experienced user's consciousness. But unfortunately at my level of experience, I am left with several fundamental questions: Does the fact that I have lost the command prompt mean that the process is still running? How do I get back to the command prompt without killing the process? How do I come back and monitor the process later? How do I eventually kill the process? Any help is appreciated, thanks so much!

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  • cp -u is illegal on mac. What are the alternatives?

    - by Barnabas Szabolcs
    I have a MacbookPro Lion, and I have tried to archive my files that is tried to copy and overwrite if the source is newer than the destination. I tried the following command cp -u source destination but it says, -u is illegal. I also did not find --update or -u in the man cp. Can you please help, what can I do in this situation? [I have the question moved over here from SO, so feel free to answer it once more. I hope this is the right way of dealing with this]

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  • Transfer disk image to larger/smaller disk

    - by forthrin
    I need to switch the hard drive on a 2006 iMac to a new SSD. I don't have the original installation CDs. I know I can order CDs from Apple, but this costs money. Someone told me it's possible to rip the image of the old drive and transfer to the new drive. If so, does the size of the new drive have to be exactly the same as the old? If not, my questions are: Is it possible to "stretch" the image from 120 MB disk to a 256 MB disk (numbers are examples)? If so, what is the command line for this? Likewise, is it possible to "shrink" an image from a larger disk (eg. 256 MB) to a smaller disk (eg. 120 MB), provided that the actual space used on the disk does not exceed 120 MB? How do you do this on the command line?

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  • How to copy a file to a remote server using the command line?

    - by cool_cs
    I am trying to copy a file from my desktop to my remote server using the sudo command. I am doing this from the remote machine since I know the password for this machine and I do not have a password for my local machine. sudo scp donj@localhost:/Desktop/my.cnf user@remotemachine:/app/MySQL/my.cnf This does not work however. I want to overwrite the my.cnf file in the MySQL directory. I tried the su command but I do not have the password to become a super user.

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  • Different behaviour of script locally and over ssh

    - by neorg
    I have a script on a server-A Script-A #!/bin/bash -l echo "script-A.sh" | change-environment.sh When I ssh onto server-A and execute it, it works fine. However, when I ssh user@server-A ./script-A.sh Script-A executes, but throws an undefined variable error in change-environment.sh. change-environment.sh runs in the c shell(I have no control over the script so the method I have used is about the only way I can use it), but everything else is in bash. Had found a similar question at I can run a script locally, but cannot do "ssh HOSTNAME /path/to/script.sh". However, there was no solution to the issue and it was a year old.

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  • How can I create a cron job that runs a task every three weeks?

    - by itj
    I have a task that needs to be performed on my project schedule (3 weeks). I'm able to set up cron to do this every week, or (for example) on the 3rd week of every month - but can't find a way to do this every three weeks. I could hack the script to create temporary files (or similar) so it could work out it was the third time it has been run - but this solution smells. Can it be done in a clean way?

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  • how to change the existing printed line in AWK

    - by manimaran
    Hi, when i execute the following line, its prints the words in newline. awk 'BEGIN { print "line one\nline two\nline three" }' like line one line two line three How can i print the info in the same line with flush the existing line. For example, while executing the loop, it should print 'one' then wipe out the line and prints 'two' then wipe out the line and prints 'three' etc. can you please assist me?

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  • Most effective way to change Linux command prompt for all users?

    - by incredimike
    I have several machines and the hostnames are really long.. i.e. companyname-ux-staging-web1.companyname.com. So my prompt looks something like [root@mycompany-ux-staging-web1 ~]# I'd like to shorten that up for all users on all machines with the least amount of work. From what I read I have a couple options, but they all have their drawbacks. I could change the hostname, but that would likely affect applications. Not a great choice. I could alter also $PS1 at login for all users by editing all .bashrc for existing users, and edit /etc/skel/.bashrc for potential new users. That's a lot of work across 10 machines. What's my best option or what have I overlooked?

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  • Kill all currently running cron jobs

    - by Adelphia
    For some reason my cron job scripts aren't exiting cleanly and they're backing up my server. There are currently a couple hundred processes running for one of my users. I can use the following command to kill all processes by that user, but how can I simplify this to kill only crons? pgrep -U username | while read id ; do kill -6 $id ; done It would be dangerous to run the above command as is, correct? Wouldn't that kill mysql and other important things?

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  • Solaris NFS: user permissions

    - by cjavapro
    I am very new to NFS. I would like to make sure I am clear. If the NFS server shares a directory rw,, and all the files in the directory are permissions 700 and user/group for those files is root/root,,, On the client you would have to log in as root to see it. Is this correct? I am aware that a non root user on the client could make a direct connection to override this. (as in don't use the mount, just use an NFS client hack.) It really seems like anyone who has access to the client machine should have access to the files and that the client machine should be ignoring permissions. Only the server should handle permissions. Am I correct in my understanding? Is it normal to have this type of layout? Is there a way to ignore the permissions on the client side?

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  • What do these abbreviations stand for ?

    - by Luc M
    Some directories are easy to understand the meaning /usr /bin ... But for the next ones, I have no idea. /etc /opt opt for optionnal ? etc for electronic t...... configuration (no idea for t) I would like to know what these abbreviations are meaning

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  • sudoers entries

    - by Pochi
    Is there a way to have a sudoers entry that allows executing of only a particular command, without any extra arguments? I can't seem to find a resource that describes how command matching works with sudoers. Say I want to grant sudo for /path/to/executable arg. Does an entry like the following: user ALL=(ALL) /path/to/executable arg strictly allow sudo access to a command exactly matching that? That is, it doesn't grant user sudo privileges for /path/to/executable arg arg2?

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  • Revoke directory access for a particular user in Solaris

    - by permissiontomars
    I have a need to allow directory access to a particular user on my file system. I want this user to be unable to access any other directory in my file system (initially anyway. It may need access to some directories later). For example: I have a directory called /opt/mydir. - I want my dedicated user to only be able to access this directory, and nothing else. - I want all other users to be able to access this directory as normal. I'm new to Linux and its permissions. I've read a fair bit of background material but I'm a little confused. Is there anyway to revoke permissions to /opt/mydir for a single dedicated user? A possible flawed method would be to only allow access to /opt/mydir and exclude every other user. This won't work because I want all other users to work as normal; accessing the directory. I'm working on Solaris 10. Any suggestions are appreciated.

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  • What do the "ALL"s in the line " %admin ALL=(ALL) ALL " in Ubuntu's /etc/sudoers file stand for?

    - by sri
    What does each ALL mean? I understand that the whole line indicates that the admin group members get admininstartive privileges, but would like to know more info about the position of the ALLS and if they each refer to a different set of permissions or something like that? $sudo cat /etc/sudoers ... # User privilege Information root ALL=(ALL) ALL #... %sudo ALL=(ALL) ALL # #includedir /etc/sudoers.d #Members of the admin group may gain root privileges %admin ALL=(ALL) ALL # If it matters: OS: Ubuntu : 10.4

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