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…
Author: Arunlal Ashok
Linux Systems Architect at Endurance International Group. Linux lover. Like to play on Linux console. I started this blog to share and discuss Linux thoughts.
Always happy for an open discussion! Write to arun (@) crybit (dot) com. Check about me for more details. About this blog and our strong members, check The team CryBit.com
Always happy for an open discussion! Write to arun (@) crybit (dot) com. Check about me for more details. About this blog and our strong members, check The team CryBit.com
Easy way to uninstall CSF from server
uninstall csf [Config Server Firewall] In our previous post, we explained the steps for installing CSF on a Linux machine. You can refer the below article. How to install and configure csf on CentOS/RHEL servers? One of the most commonly…
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…
Mongodb wont start ERROR: child process failed, exited with error number 100
Mongodb: Actual error is “Insufficient free space for journal files“. Before discussing about the error, I will give you a short information about Mongodb. Mongodb is a free and open source software for platform document-oriented database. A document-oriented database is…
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/command to block/unblock an IP address in your Linux server – IPTables command to block/unblock an IP
We have already discussed about the IPTables basics in Linux and also some common usages of it to secure your Linux server. By using iptables you can block particular IP address or a range of IP addresses on your server…
Dump Mongo DB and move it to an S3 bucket.
Requirement: Need to create a script to create Mongo DB dump and move the dump to an AWS s3 bucket. Prerequisites: SSH access to Mongo DB server, IAM user with AWS s3 full [or write] access, aws-cli on server, knowledge…
How to reset WordPress admin/users password from Linux command line?
WordPress reset password options.. We know how it can be done via PhpMyAdmin option in cPanel. We already discussed this in one of the previous post! Please check this post first, if you have a PhpMyAdmin panel and you’re comfortable with…
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…
Upload and download files using FTP (file transfer protocol) – commands
Upload and download files using FTP (file transfer protocol) – ftp command line options FTP is the abbreviation of File Transfer Protocol which is used to transfer file from one server to another. From local machine to remote server. From…
Load & Memory monitoring using SAR command – Linux
Is there any way to get my server’s load and memory usage history from commandline? Yes, it’s possible by using the command-line utility SAR. System Activity Reporter is abbreviated as SAR. It is an important tool to monitor server’s different…