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How to Fix Permission Denied Error While Using Cat Command

Often you get permission denied error while using cat command in Linux. Here is how to fix this problem.

Sometimes you may need to restrict user commands in Linux. Here are the steps to limit user commands in Linux.

Sometimes you may need to backup website to Amazon S3. Here are the steps to do it.

Sometimes you may need to check md5 checksum of installed packages on your system. Here is how to do it.

Sometimes you may need to check bad sectors and blocks in your hard disk. Here is how to check bad sectors in HDD in Ubuntu.

OpenSSL is a useful cryptographic library to encrypt & decrypt data. Here is how to encrypt & decrypt files using OpenSSL.

You need to add public SSH key to GitHub account for SSH key-based authentication. Here is how to add new SSH key to GitHub.

Sometimes you may need to connect to PostgreSQL database via SSH tunnel in pgAdmin. Here are the steps to connect via SSH tunnel in pgAdmin.

Sometimes you may need to connect to PostgreSQL server via SSH tunneling. Here are the steps to do it using port forwarding.

Sometimes you may need to connect to MySQL database via SSH tunnel in Windows. Here are the steps to do it using putTTY.