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Server Managment

Linux / UNIX – Display the permissions of a file

Q. How do I list or display the permission of a file using ssh? I don’t have GUI installed on a remote Linux computer. A.You need to use ls command with -l option. File access permissions are displayed in the first column of the output, after the character for file type. ls command List information about the FILEs. If no argument …

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Find out the spam mailing script’s location – Exim

The Exim mail server has a lot of options/commands to find out the details of spammers easily from the command line. Click this link “Spam Check” to get more ideas. We can find out the mail queue details, spam mail sender details, spam mail counts etc from the link I mentioned above. Here is a script/piped-command to find out the …

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Backup and Restore MySQL Database Using mysqldump

mysqldump is an effective tool to backup MySQL database. It creates a *.sql file withDROP table, CREATE table and INSERT intosql-statements of the source database. To restore the database,  execute the *.sql file on destination database. Using mysqldump, you can backup a local database and restore it on a remote database at the same time, using a single command. In …

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PHPMyAdmin – Unable to establish a PHP session

PHPMyAdmin error Have you ever come across the following error when you access PHPMyAdmin from cPanel. Access Denied Unable to establish a PHP session. If you believe that this is in error or inadvertent, contact your system administrator and ask them to review your server settings. Normally, you will get this error when the permission or ownership of the tmp folder …

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HowTo: Flush Contents Of a Memcached Server Using Command Line

I’ve installed memcached server under Linux but it is still showing old data. How do I flush the contents of a Memcached instance / server? You can invalidate all existing cache items using the flush_all command. This command does not pause the server, as it returns immediately. It does not free up or flush memory at all, it just causes …

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How to turn Off linux password expiration?

Question : How to turn off password expiration under Linux?   Answer: The  Encrypted password list is stored  in /etc/shadow file cat /etc/shadow   root:$1$dkk&Iw6zvgu$P3ms0o5GiXv66BzNXe0:15294:0:99999:7:: This is the explanation of the above line {userName}:{password}:{lastpasswdchanged}:{Minimum_days}:{Maximum_days}:{Warn}:{Inactive}:{Expire}: Under Linux, to turn off the password expiration  we  use a  tool   called “chage” you  can  download it via yum  or  apt-get package  managers  tools. For Debian based …

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Install Rkhunter

Overview rkhunter (Rootkit Hunter) is a Unix-based tool that scans for rootkits, backdoors and possible local exploits. It does this by comparing SHA-1 hashes of important files with known good ones in online database, searching for default directories (of rootkits), wrong permissions, hidden files, suspicious strings in kernel modules, and special tests for Linux and FreeBSD. Instructions 1. Log into your …

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