Linux 101 Hacks

10 UNIX / Linuz Size Command Examples for ObjectFiles

Ramesh — Fri, 21 Nov 2014 07:00:59 +0000

Linux size is part of GNU binutils. This utility is very helpful for programmers to analyze the data from the executable files (or object files). By default, this will provide the section size, total size for the given file name. 1. Default Size Output By default the size command displays the output which has the […]

7 Basic robots.txt File Example to Restrict Search Index

Sandeep Krishnan — Tue, 12 Aug 2014 12:55:55 +0000

Sysadmins use robots.txt file to give instructions about their site to google bots or web bots. This is called The Robots Exclusions Protocol. Crawling is the process by which Google and other search engines discovers new and updated pages to be added to the Google index. The program that does the fetching is called Googlebot […]

How to Manage Your IT Inventory with OCS Inventory NG on Linux

Vadiraj — Tue, 05 Aug 2014 12:55:13 +0000

This tool helps the System Administrators to manage their assets and software easily. Easily deployable and manageable with rich features like software deployment, reports, network scanning and more makes the life easier. I have used it on network where there are few hundreds of servers in the network. But, OCS claims that this tool can […]

8 Linux Bash Shell Readline Bind Command Examples

Ramesh — Tue, 24 Jun 2014 12:55:13 +0000

In bash shell, using bind command you can view and modify the readline keybindings. You can also set a value to a readline variable, or macro, or function. You can either put this in the .inputrc, you can add it using the bind command rom the command line. In the command line, by default it […]

5 Nagios check_ping Command Examples to Monitor Remote Host

Ramesh — Tue, 27 May 2014 12:55:02 +0000

check_ping command is a Nagios plugin that is used to check the ping output of a remote server. Based on the ping output, you can decide to set certain warning and critical threshold level, based on which Nagios can send notifications to you. If you’ve installed Nagios from source, you’ll find all the default plugins […]

How to Change RabbitMQ Log Level in rabbitmq.config from INFO to ERROR

Ramesh — Tue, 20 May 2014 12:55:10 +0000

After you’ve installed RabbitMQ server, if you don’t pay attention, depending on the usage, the log files will get filled-up very quickly. On my server, within a month, my RabbitMQ server log file reached around 5GB in size. Log files will be located under $RABBIT_HOME/var/log/rabbitmq directory. The name of the log file will be “rabbit\@dev-db.log”. […]

5 UNIX / Linux Compress Command Examples for Files and Directory

Ramesh — Tue, 13 May 2014 12:55:04 +0000

Compress is one of the compression utilities available on Linux. This command does the compression and reduces the file size using the Lempel-Ziv algorithm. The compressed file extension that is created by this utility is .Z Please note that compress command is part of ncompress package, which contains utilities for fast compression and decompression. 1. […]

6 Nagios check_ftp Command Examples for FTP Monitoring

Ramesh — Tue, 06 May 2014 12:55:07 +0000

check_ftp plugin is used to verify the status of your remote FTP server. If you’ve installed Nagios from source, check_ftp command will be located in the /usr/local/nagios/libexec directory. 1. Basic check_ftp Command Check whether FTP server is up and running. As you see in the following output, it connects to two different server, one running […]

How to Fix “java.io.FileNotFoundException Too many open files” Error

Ramesh — Tue, 29 Apr 2014 12:55:15 +0000

From your java application, under certain circumstances, you might be getting “java.io.FileNotFoundException: Too many open files” error message. There are two typical solutions to it: Check your application logic and make sure it is not opening too many files unnecessarily (for example, In a loop there is file open, but it is not getting closed […]

How to Update pci.ids PCI ID Device File using update-pciids on Linux

Ramesh — Tue, 22 Apr 2014 12:55:53 +0000

If you have not updated PCI IDs on your system in while, it is a good idea to keep it updated once in a while. If you notice that lspci command is not displaying the proper device name for any of the devices that are connected to your PCI bus, this might be because the […]