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  • May 04 / 2017
  • 0
Linux

Reduce partition size on EXT filesystems on Linux

It is possible to modify a partition size on EXT filesystem thanks to some few commands.

We will take here a simple example:

  • We have a /dev/sda5 partition mounted on /home
  • Its size is currently 150G and we want to reduce it to 100G

Let’s check the current config (mounting point and size):

We need to first unmount the partition:

If you can’t unmount it, double check what process is using it with the lsof command:

Then proceed with a check with e2fsck command and resize the partition with resize2fs by defining the new size (M for Megabytes, G for Gigabytes, and so on…)

Mount your partition back to your system:

And check again your partition sizes :

We can see that the partition /home has now a size of 100G as expected!

  • Apr 24 / 2017
  • 0
Linux

Find ILO IP on a HP server with Linux

If you forgot what iLO IP has been defined on your linux server and you are working remotely on it, don’t worry, you can still retrieve it with a common tool called ipmitool – available on most of the distros with standard packages:

If you’re getting such an error when you are using the command:

This means you just need to enable some modules before:

  • Apr 13 / 2017
  • 0
Linux

Quit telnet – Escape character

Stuck with a telnet session that refuses to give you hand back on console?
No worries… You just have to know the correct command to sort this out!

When you are opening a telnet connection, you probably got something like:

So, if you want to quit, you just have to use the “escape character” as indicated. But this character is not designed to be typed with 2 characters like “^” and then “]” – you have to use a direct command that can be different depending on your OS:

  • Windows: Ctrl + $
  • Linux: Ctrl + Alt Gr + ]
  • Mac OS: Ctrl + $

And press Enter once you inserted this escape character so you can get the standard telnet prompt and be able to type quit to exit the prompt.

This will result in a command like:

And here you go – you’re out of telnet 🙂 !

  • Apr 07 / 2017
  • 0
Linux

Display time with history command

When you are using the history command on a UNIX system, by default, you’re only getting an action list with numbers but no date and/or time to complete this history. For that, you have to define an environment variable HISTTIMEFORMAT that will describe how you want to display the timestamp for each command.

To display the timestamp temporarily (during session), you can just export the variable before sending the command:

You will get:

If you want to keep that display for a future session, you have to add this variable to your bash profile and reload your profile:

  • Mar 24 / 2017
  • 0
Linux

Create multiple symlink by changing name with command find

Let’s imagine that we have the following directory listing:

We would like to get a copy of those files named 2016 with a new name for the 2017 year, but we need to keep same content and retro-compatibility. For that, it’s easier to create some symbolic links of all those files instead of doing copies.

You can so use this command for creating those symlinks:

We are now getting this, as expected:

  • Mar 05 / 2017
  • 0
Linux

Use wget/curl behind a proxy

If your machine is behind a proxy, you probably configured your browser for going through the proxy to reach Internet. But what about command line with curl and wget?

If you want to add the proxy temporarily for some few installations for example, just type (by replacing URL and port with yours):

If you want to make the changes globally and keep it after a restart (or a new login), you can:

  • Add those lines in ~/.wgetrc to make it available only for wget and for the current user
  • Add those lines in /etc/environment to make it work for either curl/wget or any http relevant command:

If you need authentication, you can simply include username and password in your connection string like:

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