How to disable SSH login as root user – PermitRootLogin? PermitRootLogin – is an important directive in SSH configuration file to control the ssh login as root user. You can enable / disable root login access using this directive in…
commands
Head command switches with example in Unix/Linux
7 plus head command switches with example in Unix/Linux The head command By default, the head command prints the first 10 lines from the file which is given followed by the head command. In the case of more than one…
Tail command switches with example in Unix/Linux
10+ useful tail command’s switches with example – Unix/Linux The tail command By default, the tail command prints the last 10 lines from the file which is given followed by the tail command. In the case of more than one…
Identify all open files in a directory – lsof command
How to check all opened files in a directory – lsof command? LSOF is a smart linux command-line utility for analysing the information about the files which are opened by various processes. LSOF stands for List of Open Files. This command…
Install and configure iftop (network analyser) – Unix/Linux
How to install iftop on Unix/Linux server? The command “iftop” is using for bandwidth (BW) monitoring on a server. It is simple to monitor a server BW with iftop command. You can analyse the incoming and outgoing packets using iftop…
Load monitoring in Linux servers – top, w and uptime commands’ usage for checking the load on server
Load on Linux – top, w, uptime This is a necessary thing to check the load-average on your server for its better and stable performance. In a Linux server/system we can check the load by different ways. High load on…
20+ Rsync command’s switches and common usages with examples – Unix/Linux
The “rsync” is a powerful command under the Linux environment. The rsync stands for Remote Sync. Normally rsync is used to transfer file from one server(source) to another server(destination). rsync has a lot of switches or option for managing the…
Analysing mail log details – Exim log file flags a detailed view
How to analyse the mail log details – Exim? To play with email issues we’ve a good knowledge about the log file and different log line flags. We know the basics of exim MTA and its basic commands. We already discussed…
15+ tar command usages with examples – Unix/Linux
tar command in Linux. This is one of the most commonly using Linux command. This is very similar to the ZIP concept in Windows platform, what we are using commonly to save multiple file together. The ‘tar‘ saves many files…
Exclude a directory or multiple directories while using find command
Is it possible to exclude a directory with find command? Yep, the command FIND has wide range of options to search what you actually looking for. I have already listed different switches and its usages with examples. Here we go…
10+ useful grep command options with examples – Unix/Linux
The grep command is one of the most widely using Linux command. The name GREP is the abbreviation of Global Regular Expression Pattern. Yep! it’s pattern search tool under Unix. By-default the grep command lists all matching lines from the…
How to know the MySQL uptime from commandline – 3 Methods
MySQL uptime. In some situations, we need to check the uptime for MySQL in your server. We can not afford the downtime of a database engine. As a system engineer you must know the linux command-line options to find the…
How to install GCC (GNU C / C++) compiler – Unix/Linux?
If you get errors which representing the missing of GNU C / C++ compiler on your Linux server, you can simply install it by the help of Linux package installer like YUM, Apt-get etc. Installation of GNU C / C++…
How to check spamming on server which has Exim MTA?
Electronic spamming is the use of electronic messaging systems to send unsolicited messages (spam), especially advertising, as well as sending messages repeatedly on the same site. It happens in many ways on a mail server. Spamming is one of the…
10+ commonly using find command switches with example Unix/Linux
Find command is one of the best search tool in Unix/Linux. There are a lot of options available with find command. This command is very useful in bash scripting also. We discussed one of the useful find command application to…