Dev {Tricks}

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How to Clean the YUM Cache in CentOS

We need to clean the YUM cache to reclaim the disk space used or to fix some errors due to corrupted metadata files.

  • Clean all the cached packages from the enabled repository cache directory. 
    yum clean packages
  • Delete package headers. 
    yum clean headers
  • Delete metadata for each enabled repository. 
    yum clean metadata
  • Clean database cache

yum clean dbcache
  • Clean expire cache

yum clean expire-cache
  • Clean all cached information. 
    yum clean all

Done!

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How to Install Zip/Unzip

How to Install Zip/Unzip in Debian/Ubuntu/Mint

apt install zip

apt install unzip

How to Install Zip/Unzip in RedHa/CentOS/Fedora

dnf install zip

dnf install unzip

How to Install Zip/Unzip in Arch/Manjaro Linux

pacman -S zip

pacman -S unzip

How to Install Zip/Unzip in OpenSUSE

zypper install zip

zypper install unzip

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Missing vmail Folders .Sent, .Trash, .Drafts, .Junk, and Other

  • Missing Sent, Trash, Drafts, Junk, and Other Folders

Solution: Check whether the dot files are hidden. Make the dot files to show.

Horde

  • Click on the Folder Actions option.
  • Choose the Rebuild Folder List option.
  • Then choose the Show All Mailboxes option.

Roundcube

  • Go to Settings.
  • Click Folders.
  • Re-subscribe to each folder by clicking the check box.

Windows Mail

  • Click IMAP Folders.
  • In the Show/Hide IMAP Folders dialog box, select a folder.
  • Click Show.

Thunderbird

  • In the Folder pane, look for IMAP mail and right-click on it.
  • Go to Settings, click on Server Settings, then select Advanced.
  • Remove the checkmark on Show only Subscribed folders.
  • Click OK.

Microsoft Outlook Express

  • Under Folders on the left side of the screen, select the inbox for your email (NOT the one under Local Folders).
  • Click the Tools menu, then select IMAP Folders.
  • Select the desired folder(s).
  • Click Show.
  • Click OK.

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Xauthority does not exist

  • /usr/bin/xauth: file /root/.Xauthority does not exist

Solution

Go into the sshd_config file

vi /etc/ssh/sshd_config

Search and remove the # sign at the beginning of the 3 lines

X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes

Then restart sshd

systemctl restart sshd

Exit and login again. You will not get the error.

 

Or

Create n new file: touch ~/.Xauthority

Log out and login in again.

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How to change the root password

  • Resetting the Root Password
  • How to Change a Password in Linux
  • How to Reset or Change the Root Password in Linux
  • How to change root password in Ubuntu Linux
  • How to Reset the root Password

1. Login to your server using existing root password.

2. After login you can change the root password with below command.

passwd root

That’s aLL!