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  • Sed: Deleting all content matching a pattern

    - by Svish
    I have some plist files on mac os x that I would like to shrink. They have a lot of <dict> with <key> and values. One of these keys is a thumbnail which has a <data> value with base64 encoded binary (I think). I would like to remove this key and value. I was thinking this could maybe be done by sed, but I don't really know how to use it and it seems like sed only works on a line-by-line basis? Either way I was hoping someone could help me out. In the file I would like to delete everything that matches the following pattern or something close to that: <key>Thumbnail<\/key>[^<]*<\/data> In the file it looks like this: // Other keys and values <key>Thumbnail</key> <data> TU0AKgAAOEi25Pqx3/ip2fak0vOdzPCVxu2RweuPv+mLu+mIt+aGtuaEtOSB ... dCBBcHBsZSBDb21wdXRlciwgSW5jLiwgMjAwNQAAAAA= </data> // Other keys and values Anyone know how I could do this? Also, if there are any better tools that I can use in the terminal to do this, I would like to know about that as well :)

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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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  • /dev/shm (shared memory) on linux

    - by Kirzilla
    Hello, Let's imagine that we have 8Gb of RAM on server. I'm mounting /dev/shm with 4Gb on board. mount -o remount,size=4G /dev/shm Will this memory be strictly reserved for shared memory or if /dev/shm is empty this memory could be used by regular applications (web server, php etc.)? PS:Sorry for my English. I'm asking it because I've just checked df -h and found tmpfs 6.0G 0 6.0G 0% /dev/shm on 8Gb RAM sever. I don't know who made this setup, but it seems to me awful. Thank you!

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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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  • How can I document and automate a system's configuration?

    - by Diomidis Spinellis
    Having a system's configuration represented by its current state is risky, inefficient, and opaque. At some point you may be left with an unsupported system and no upgrade path. Then configuring a new system compatible with the old is a process or trial and error. Furthermore, if at some point the system is damaged the only option is to go back to the most recent full backup, and try to remember what changes followed from that point. Also, the only way to create a system compatible with the original is through a complete dump/restore. Finally, in such a setup there's no way to know how you solved a particular problem; the only thing you can do is to look at the corresponding configuration files and try to guess what you changed to achieve the desired effect. Currently for each system I maintain, I keep a log file where I record all system administration activity, starting from the installation: installation options, added packages, changes in configuration files, updates, problem fixes etc. In theory this allows me to (manually) replay all changes to arrive at the current state, or to unroll an erroneous change by executing the reverse commands. However, this process is also inefficient, error-prone, and relies on human judgment. Another thing I've tried is to put /etc configuration files under version control with git. This helps me document the changes automatically and also apply them on a clean setup. But it's not without problems: git has to run under sudo, passwords and private keys may be stored in the repository, installed packages can't be meaningfully tracked, and git will have a fit if I try to extend this approach to all the system's directories. I've also thought about performing all changes through shell scripts or makefiles, but I think this process will require a lot of effort and will be fragile. Are there some better methods or tools that I'm missing?

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  • GNU Screen: one window per screen or one screen with multiple windows?

    - by yalestar
    I've inherited a few sys admin tasks recently and am trying to wrap my head around using screen. The way the previous guy left it, there are four screen sessions running, some of which have two or three windows running within. It doesn't appear that he was using any particular convention, so I ask you: Is it better to have each process in its own screen session, or better to group similar processes into a single screen? Or something different entirely?

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  • Mount a tar file - not possible?

    - by leonbloy
    It seems one cannot mount a tar file (read only), similarly as one mounts an ISO image file. At least, I have not found any implementation. It would be useful, for example to run a find command inside. Is this really (or practically) impossible to implement? Why?

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  • What do these acronyms 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 acronyms are meaning

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  • Setting a mail server without root?

    - by Legend
    Is it possible to setup a mail server on a Linux machine without root permissions? I want to be able to create two aliases for a given mail ID. But if I remember correctly, it is no possible to do this without root privileges because I need to edit the configuration file and then restart the mail server. Does anyone have a suggestion to get around this problem?

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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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  • 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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  • 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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  • 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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  • How to batch edit a list of files?

    - by user43144
    I have a list of files where I need to remove some lines that have been added yesterday by a spambot. The section I want to remove looks like this: ^M <script>[...] bunch of malware code [...]</script> That section seems to have been appended to the files, so I can be relatively sure it's the last lines of each file that contain this part. Now I know a bit of Linux, but not enough to do this via a command. How would I go about and do this?

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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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  • 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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  • Open file without specifying exact location

    - by person
    Say I have a file in some obscure directory that I want to open and edit. I don't want to do something like this... vim ~/foo/bar/blah/doh/ugh.txt I'd rather be able to say find this file and open it. I know there are commands like locate and find to find a file or directory, but I'm not sure whether these can (or even should) be utilized in what I'm trying to do. Basically, what is the simplest way to open a file with a program w/o specifying its exact location? (In cases where there isn't another file with the same name in the entire system, and cases where there are multiple).

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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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