Check pending mail To check how many pending mail, type the following command # mailq
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From the category archives:
Sys Admin
Deny user login by /etc/shadow Default, Linux systems use /etc/shadow to store the encrypted user passwords. The quickest way to block a user is to alter is password stored in /etc/shadow. Normally an active user account will have one line in /etc/shadow that will look like: files:$1$x52JQZle$82KTK0hbzozR3BRuwEWLF.:14970:0:99999:7:::
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How do you managing the mailbox size for users configured with the Postfix mail server ?. And how to avoid “error writing message: File too large” ?
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If you need additional swap space to improve your system performance. You have two different ways: add/upgrade a swap partition or create a swap file. But changing the size or create a new swap partition is not easy, the best solution is to create a new swap file. This articles help you add/create swap file […]
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Find files larger than a certain size This example finds all the files under /root directory which are larger than 50k [root@lifelinux ~]# find /root -size +50k Sample output /root/ioncube/ioncube_loader_lin_5.3_ts.so /root/ioncube/ioncube_loader_lin_4.1.so /root/ioncube/ioncube_loader_lin_5.1.so /root/ioncube/ioncube_loader_lin_4.2.so …
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You can apply kernel updates using “yum” command or “apt-get” command line options. After each upgrade you need to reboot the server. How to skip reboot step and apply hotfixes to kernel without rebooting the server ? What is Ksplice Uptrack? Ksplice Uptrack is a subscription service that lets you apply 100% of the important […]
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