Linux / Unix Tips and Tricks

Here's the command that I use to synchronize a filesystem from one server to another: rsync -avx --numeric-ids --progress --delete 10.0.0.1:/mnt/sda1/ /mnt/sda1/ The -a option sets “archive mode”, which essentially turns on a number of rsync options that preserve...

Today I wanted to install a Perl module in my home directory. Here's how to do it:  (More)

Sometimes it's handy to be able to manage your Virtual Machines on the Command Line. So if you are stuck in traffic and only have an SSH login available on your mobile phone, here are the commands to manage your Virtual Machine: Listing configured Virtual Machines: $...

Here's a perl oneliner that does text search & replace over multiple files. Make sure you create a backup before using it !   (More)

I once got myself in the situation where I had no option but to retrieve a missing file from a rpm package. I didn't want to install the whole rpm, but only extract the missing file. Here's an example how to extract the original httpd.conf from the httpd package:  (More)

Last month I have migrated several physical Linux servers to VMWare using this excellent howto: Virtualize a Server with Minimal Downtime After migrating an old RedHat 9 server to VMWare, I got an error saying fsck.ext3: Filesystem has unsupported features . This is because RedHat...

Suppose you want to copy a directory structure from one machine to the other. You could create an archive (using tar or cpio), copy over the archive and extract it. But there's a better way to do it by combining tar and ssh.   (More)

Len Kranendonk
Unix System Specialist.
Broad experience in web development and open source technologies.

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• Using rsync to synchronize a filesystem
• TT Assen 2009
• Solaris 10: Enable Samba for Windows File Sharing
• Changing Veritas device owner for raw device
• Perl: how to install a Perl module locally
• VMware Server: Managing virtual machines from the command line
• Setting your X environment
• Replacing text in multiple files
• Linux: How to extract a single file from a RPM package
• Solaris: Determinate to which package a file belongs

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