Questions in Linux

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• How to get summarized sizes of folders including their subfolders?

  Well there are few ways to achieve this, here are two: du -sh /* This will spit out a summary for the
  10701 views
• How to duplicate / copy GPT partition table?

  sfdisk doesn´t do the trick on GPT tables, so this will not work.   This is also easy, we need to install aptitude
  15097 views
• How to skip or bypass fsck on reboot / system startup?

  There are a few ways to make this happen, the simplest way is to reboot the machine with this command: shutdown
  20688 views
• How to clean drives from software raid (mdadm)?

  Software raid is really great in Linux, but once you need to repurpose old drives,or lets say some other implementation
  17836 views
• How to restart network card auto-negotiation?

  This might be necessary some times, here the line to do it with ethtool: ethtool -r eth1  And here with mii-tool: mii-tool -r
  15565 views
• How to change speed / duplex setting of a network connection?

  Well, you can do this with mii-tool or ethtool, both should be working nicely. On Debian to install those, run
  31294 views
• How to display environment variables?

  This is also pretty simple:   printenv
  11605 views
• How to edit a very large file?

  I had to remove one line of a 20GB MySQL dump file and was wondering how I could do this. Actually
  16102 views
• How to fix mdadm / mdraid resync=PENDING or auto-read-only?

  This happend to me when I created a new md device and checked for the status in /proc/mdstat.The problem is
  31114 views
• How to repair GRUB with a live cd?

  There are many things that could go wrong with a GRUB installation and one way to get the system booting
  15310 views
• How to change crontab email setting ( MAILTO ) ?

  This is quite easy, just add the MAILTO line to your crontab, preferable to the top, so config parameters stay
  30422 views
• How to duplicate / copy partition table?

  In Linux there is a small helpful tool for this, called sfdisk. It is able to diplays and manipulate the
  14431 views
• How to fix "Internal error: Berkeley DB error for filesystem"?

  After working with the subversion system pretty flawlessy for years (as standalone service and within apache), I had this problem
  13678 views
• How do I upgrade from Debian Lenny to Squeeze?

  Here you go: (please do that in textmode and not in your GUI, so KDE or whatever can be restarted without
  16218 views
• How to convert an ext3 partition to ext4?

  Well, this is actually not too hard and ext4 gives better performance in various cases, so an update to ext4
  14339 views
• How to undelete removed/deleted files on an ext3 / ext4 fs?

  Here is a new tool that will help you with recovering files from an ext3 or ext4 partition:http://extundelete.sourceforge.net/ 
  14603 views
• How to install Debian Lenny from a USB stick?

  Hi there,the only hard thing here is preparing the USB stick, but actually the Debian guys took care of most
  16189 views
• How to stop ssh brute force attacks?

  well, there are a few way, the way of my choosing is to just use the recent module from iptables: iptables
  13723 views
• How do I convert an ext2 to an ext3 file system?

  first of all: check if your kernel supports ext3!(most kernels since 2006 do that anyhow, so you should be fine)  optional
  14204 views
• How to undelete removed/deleted files on an ext3 fs?

  Well, there are three ways I know and have succeeded so far: Follow this instructions: http://www.xs4all.nl/~carlo17/howto/undelete_ext3.html the other way is to scan
  13955 views

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