Useful tips for everyday
How do I change the backlight on my monitor? Open the Settings app from your Start menu or Start screen, select “System,” and select “Display.”…
How do I list security updates in Linux? You can list installed security updates for your system by using the yum utility. List all security…
Are file descriptors automatically closed? Files are automatically closed, but it’s a good practice. FILE pointer returned by fopen() is not a file descriptor. It…
What is difference between if/then and if/then else? “if/then” lets you test a condition and provide instructions for when the test is true. “if/else” lets…
How do I setup a Network between guest VM and host in Oracle VirtualBox? At the Virtualbox manager interface below, start by creating a network…
What happens when a system call is called? When a user program invokes a system call, a system call instruction is executed, which causes the…
Why does gpg error say signatures were invalid? GPG error: http://apt.postgresql.org precise-pgdg Release: The following signatures were invalid: KEYEXPIRED 1381654177 The solution is perfectly described…
How do I know if PHP script is running? Check the access logs for your web server. They’ll show you what has run, and if…
How to append a line to a file in Bash? To append the output to the file use tee with the -a (–append) option: echo…
How to grant access to sub folder when no access to parent folder? As Dinesh Lakkaraju mentioned, you may share the subfolder so that users…