Show line numbers in vi/vim editor.
Sometimes you need to find a specific line in a file, such as one identified by an error log. vi/vim can easily display or hide line numbers.
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389 notes on Linux, tools and troubleshooting
Increase the maximum file descriptors for Squid
If Squid logs WARNING! Your cache is running out of filedescriptors in cache.log, it was compiled with a maximum of 1024 file descriptors.
Reduce a non-root LVM.
This example reduces a 10 GB LVM volume to 8 GB, assuming it is mounted at /data, by shrinking the filesystem before reducing the logical volume.
View the commented lines of text in a config file
Use grep to display configuration lines that begin with particular characters. This helps inspect comments and review configuration settings.
Configure the shell to logout automatically after a period of idle time.
On systems with many users, users who leave without logging out waste system resources. This method addresses that and also improves security…
Access a USB flash drive in Linux.
Linux normally mounts USB flash drives or thumb drives automatically when you plug them in. Sometimes it does not, which can frustrate new users…
What is a Red Hat Enterprise Linux Installation Number and where do I get it?
Resolution: The Red Hat Enterprise Linux 5 Installation Number is a 16-character hexadecimal text string used during the installation process. The installation number enables a user to install the ful
Disable some CPUs within Red Hat Enterprise Linux 5 without rebooting the system
Warning: check that your hardware supports CPU hot swapping before trying these commands; otherwise the hardware may be damaged.
Resize multiple image files using command-line tools
This article may be useful to webmasters. It covers Linux commands for resizing JPEG, TIFF, PNM, GIF, and other Photo CD image formats. The procedure is straightforward…