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  • When to use Bash, when Python/Perl/Ruby? [closed]

    - by futlib
    What's your rationale for when to write a Bash script and when to use a more powerful scripting language (Python, Perl, Ruby, ...)? I'm finding that very simple scripts are nicer with Bash, but many of those get quite fancy over time, and it never seems like a good idea to rewrite the whole thing. That's why I'm leaning towards always using Python for all scripting. But since Bash seems to be the the lingua franca of Linux scripting, is that something a responsible system administrator would do?

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  • How do you change topdir as a user in SSH?

    - by JM4
    I have read several places NEVER to build RPM's as the root user. As such, I defined a new user and have tried building out RPM structures there, however, using the rpmbuild --rebuild src.name.rpm returns an error which states the topdir cannot be accessed: Installing curl-7.20.1-1.src.rpm error: cannot write to %sourcedir /usr/src/redhat/SOURCES error: curl-7.20.1-1.src.rpm cannot be installed does anybody know how to make this change? I have a correct /src/ directory set up under the new user.

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  • file saving problem into the network

    - by santosh
    i have a problem when i save the office file in to the server through the client its show you it is read only file & also shows the disk is full or write protected what have to for this problem please give me the seggstion if have

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  • Feed aggregator with E-mail/RSS channels

    - by Toc
    Which feed aggregators, besides FriendFeed, allow RSS and e-mail as input and output channels? That is, allow to suscribe external RSS feeds and to write a post by e-mail, and allow to be notified both by RSS feed and by e-mail?

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  • Sending a UDP message to a computer inside a network

    - by Dan
    Say I have the ip and mac address of a computer inside a network and I wish to send him a UDP message. By initializing the mac and ip addresses of the sent message to the given, when the network router recives the message he should pass it to the computer with the same mac address...right? Im asking becuase a program I write dosent seem to handle this limitation. it works great when its on the same network, but otherwise ...nada. Thanks

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  • Concurrent NFS access

    - by Kristian
    Similar to Concurrent FTP access. How is concurrent file access handled for NFS? Say that one client is updating/overwriting a file on a NFS server, and a process on the server is reading that same file directly from the file system at the same time. Is there some sort of atomic handling of file read/write in NFS/Linux or do I have to work with tmp files to ensure data consistency? I'm worried that the process reading the file will get corrupt data.

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  • How do I create a bridged virtual network for libvirt+KVM+ubuntu-server the easy way?

    - by Arthur Ulfeldt
    I see lots of documentation on how to manually set up a network bridge and then manually add vm's tun devices to these bridges and then write a shell script that glues it all together. lots of work, very manual, and not impressive. On the other hand if you want to use NAT to KVM+libvirt VMs to the network you just click the new network button in the virt-manager gui and relax. Am I missing "the easy way" of causing a VM to share the physical network with the host?

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  • What is the state of ext3 support in Mac OS X 10.6? [closed]

    - by gzuki
    Possible Duplicate: Mount ext2/ext3 in Mac OS X Snow Leopard I have a 1tb hard drive, I want it to have one partition that can serve as an interchange between linux (ubuntu) and mac (snow leopard). HFS+ scares me a bit, and I can't seem to get a clear picture on whether or not something like fuse can reliably write ext3 partitions in mac. Any good advice on this topic? Should I just pick HFS+ or ext3 and hope for the best (or just deal with only getting read-only on one OS)?

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  • what's the hostname/domain when installing freebsd

    - by Omu
    I am trying to install FreeBSD using vmware workstation I get to a screen where I have to configure the DHCP (some values are set automatically cuz I've set to configure DHCP auto in options) but the hostname is empty and domainname is .localdomain, what values should I write in there

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  • more than one start statment in the same bash ?

    - by Mohammad AL-Rawabdeh
    i write the following bash file :- start D:\folder1\bin\run.bat start D:\folder2\bin\run.bat start D:\folder3\bin\run.bat start D:\folder4\bin\run.bat but it is execute the first start but give me the following error:- windows cannot find " D:\folder2\bin" Make sure you type the name correctly, and then try again. To search for a file, click the start button,and then click search *Note :- I'm sure spelling correct and i'am put start D:\folder2\bin\run.bat in other file and it is execute correctly

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  • Install SFTP on Debian Lenny use root user to login

    - by user272899
    I am new to linux. I have a server that I have successfully installed Debian Lenny on and everything else needed for a LAMP server. But I am unsure how to setup FTP. My first attempt went horribly wrong had a load of permission issues. How can I give full read/write access to my WWW folder. The more in-depth the answer the better. I feel like such a noob.

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  • Apache ignore my .htaccess 'dontlog' option

    - by Emilio
    I wrote .htaccess in file dir/subdir to don't log URI requests in this particular directory. The .htaccess is actually executed by apache (if i write deny from , it works), but if the file contains only this rule: SetEnvIf Request_URI "^dir/subdir" dontlog Don't work. AllowOverride All and mod_rewrite are enabled. What can be the problem? Sorry for my bad english.

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  • Why does writing a file to an NFS share send a COMMIT operation to the NFS server?

    - by Antonis Christofides
    I have a Debian squeeze (2.6.32-5-amd64) which is at the same time a NFS4 server and client (it mounts itself through NFS4). The local directory that leads directly to disk is /nfs4exports/mydir, whereas /nfs4mounts/mydir is the same thing mounted through NFS, using the machine's external IP address. Here is the line from fstab: 192.168.1.75:/mydir /nfs4mounts/mydir nfs4 soft 0 0 I have an application that writes many small files. If I write directly to /nfs4exports/mydir, it writes thousands of files per second; but if I write to /nfs4mounts/mydir, it writes 4 files per second or so. I can greatly increase speed if I add async to /etc/exports. (Writing a single large file to the NFS-mounted directory goes at more than 100 MB/s.) I examine the server statistics and I see that whenever a file is written, it is "committed" (this also happens with NFSv3): root@debianvboxtest:~# mount -t nfs4 192.168.1.75:/mydir /mnt root@debianvboxtest:~# nfsstat|grep -A 2 'nfs v4 operations' Server nfs v4 operations: op0-unused op1-unused op2-future access close commit 0 0% 0 0% 0 0% 10 4% 1 0% 1 0% root@debianvboxtest:~# echo 'hello' >/mnt/test1056 root@debianvboxtest:~# nfsstat|grep -A 2 'nfs v4 operations' Server nfs v4 operations: op0-unused op1-unused op2-future access close commit 0 0% 0 0% 0 0% 11 4% 2 0% 2 0% Now in the RFC, I read this: The COMMIT operation is similar in operation and semantics to the POSIX fsync(2) system call that synchronizes a file's state with the disk (file data and metadata is flushed to disk or stable storage). COMMIT performs the same operation for a client, flushing any unsynchronized data and metadata on the server to the server's disk or stable storage for the specified file. I don't understand why the client commits. I don't think that the "echo" shell built-in command runs fsync; if echo wrote to a local file and then the machine went down, the file might be lost. In contrast, the NFS client appears to be sending a COMMIT upon completion of the echo. Why? I am reluctant to use the async NFS server option, because it would apparently ignore COMMIT. I feel as if I had a local filesystem and I had to choose between syncing every file upon close and ignoring fsync altogether. What have I understood wrong?

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  • Default permission for newly-created files/folders using ACLs not respected by commands like "unzip"

    - by Ngoc Pham
    I am having trouble with setting up a system for multiple users accessing the same set of files. I've read tuts and docs around and played with ACLs but haven't succeeded yet. MY SCENARIO: Have multiple users, for example, user1 and user2, which is belong to a group called sharedusers. They must have all WRITE permission to a same set of files and directories, say underlying in /userdata/sharing/. I have the folder's group set to sharedusers and SGID to have all newly created files/dirs inside set to same group. ubuntu@home:/userdata$ ll drwxr-sr-x 2 ubuntu sharedusers 4096 Nov 24 03:51 sharing/ I set ACLs for this directory so I can have permission of sub dirs/files inheritted from its parents. ubuntu@home:/userdata$ setfacl -m group:sharedusers:rwx sharing/ ubuntu@home:/userdata$ setfacl -d -m group:sharedusers:rwx sharing/ Here's what I've got: ubuntu@home:/userdata$ getfacl sharing/ # file: sharing/ # owner: ubuntu # group: sharedusers # flags: -s- user::rwx group::r-x group:sharedusers:rwx mask::rwx other::r-x default:user::rwx default:group::r-x default:group:sharedusers:rwx default:mask::rwx default:other::r-x Seems okay as when I create new folder with new files inside and the permission is correct. ubuntu@home:/userdata/sharing$ mkdir a && cd a ubuntu@home:/userdata/sharing/a$ touch a_test ubuntu@home:/userdata/sharing/a$ getfacl a_test # file: a_test # owner: ubuntu # group: sharedusers user::rw- group::r-x #effective:r-- group:sharedusers:rwx #effective:rw- mask::rw- other::r-- As you can see, the sharedusers group has effective permission rw-. HOWEVER, if I have a zip file, and use unzip -q command to unzip the file inside the folder sharing, the extracted folders don't have group write permisison. Therefore, the users from group sharedusers cannot modify files under those extracted folders. ubuntu@home:/userdata/sharing$ unzip -q Joomla_3.0.2-Stable-Full_Package.zip ubuntu@home:/userdata/sharing$ ll drwxrwsr-x+ 2 ubuntu sharedusers 4096 Nov 24 04:00 a/ drwxr-xr-x+ 10 ubuntu sharedusers 4096 Nov 7 01:52 administrator/ drwxr-xr-x+ 13 ubuntu sharedusers 4096 Nov 7 01:52 components/ You an spot the difference in permissions between folder a (created before) and folder administrator extracted by unzip. And the ACLs of a files inside administrator: ubuntu@home:/userdata/sharing$ getfacl administrator/index.php # file: administrator/index.php # owner: ubuntu # group: ubuntu user::rw- group::r-x #effective:r-- group:sharedusers:rwx #effective:r-- mask::r-- other::r-- It also has ubuntu group, not sharedusers group as expected. Could someone please explain the problem and give me advice? Thank you in advance!

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  • Apache2 and logrotate: delaycompress needed?

    - by j0nes
    Hello, I am currently looking at the file size of my Apache logs as they became huge. In my logrotate conf, I have delaycompress enabled. Does Apache really need this (as the logrotate documentation says that some programs still write in the old file) or is it safe to disable delaycompress? Best regards, Jonas

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  • Can I "export" an alias to the SHELL that invoked a script?

    - by RonK
    I'm trying to write a utility script that defines certain aliases. My SHELL is tcsh (can't change that). I tried the following #!/bin/tcsh alias log 'less ~/logs/log.date '+%Y%m%d''' Then I run it like this: ./myscript log The output I get is: log: Command not found. Naturally if I run it like this: source myscript log Everything is fine. Any way to do it without specifying source ...?

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  • Make logwatch reports more interesting?

    - by Alexander Shcheblikin
    Is it possible to improve the quality of reports from logwatch? Like make it not just report disk usage which doesn't even change much in daily operation, but report significant changes in usage or approaching critical capacity levels? If I cannot do that with logwatch and instead have to write custom scripts to produce such reports, logwatch appears to be pretty useless, or even dangerous, as many users reportedly grow to ignore emails from it knowing they are so boring.

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  • Regarding Unix Move Command

    - by user38993
    I need to write an Unix Shell Script tran.sh that moves the csv input files from /exp/files folder to /exp/ready directory. The csv input files are written to /exp/files folder by an FTP server whose behavior I cannot trivially change. In tran.sh shell script I need to ensure before doing a move of that csv input file from /exp/files directory no longer any other process is writing to the file. How can I do it.

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  • What is the most secure way to allow a user read access to a log file?

    - by gAMBOOKa
    My application requires read access to /var/log/messages, which belongs to user and group root. What is the minimal exposure level required on /var/log/messages so my application can read it? Presently, my plan is to change the group ownership of /var/log/messages to a new group, and add root and my application user to it, but this would also give the application write privileges to /var/log/messages. OS: Centos 5.5

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  • Squid Log Rotation and Sarg

    - by beakersoft
    We have just setup squid as our proxy, and i was going to use Sarg to analyze the log files. I had initially set the Squid logs to rotate everyday so they dont get huge. The problem is i cant see an option in the squid config to read a folder full of squid log files (say *.log). Is there an easy way to do this or am i going to have to write a bash script or something to process them all into one before i get squid to read it? Cheers Luke

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