A robots.txt file is a file used by web servers to communicate with web robots (also known as “bots” or “crawlers”) about which pages or sections of a website should or should not be crawled and indexed. The default content of a robots.txt file can vary depending on the web server and the specific configuration, … Read more
In Unix and Linux systems, the passwd command is used to change a user’s password. The basic syntax is as follows: passwd [options] [username] If you’re changing your own password, you can simply run the command without specifying a username: passwd The system will prompt you for your current password and then for … Read more
The “awk: warning: escape sequence ‘<‘ treated as plain ‘>’” error message is produced by the awk command when it encounters an escape sequence in a string that it does not recognize. In this case, the escape sequence \< is being interpreted as >, which can cause unexpected results in your script. To resolve this … Read more
The “warning: CUPSEXT could not be loaded. Please check HPLIP installation” message usually indicates that there is an issue with the HPLIP (HP Linux Imaging and Printing) package installed on your Linux system. This message can occur when trying to use the HPLIP toolbox or run a HP printer setup. To resolve this issue, you … Read more
You can blacklist a package from being installed in Debian or Ubuntu using the apt-mark command. This allows you to prevent a package from being installed, updated, or removed, even if it is specified as a dependency by another package. Here’s how to blacklist a package: sudo apt-mark hold <package_name> Replace <package_name> with the … Read more
To find out the DNS server IP addresses or names in a Unix-like operating system, you can use the nslookup command or the cat command to view the /etc/resolv.conf file. Here’s how to use nslookup: nslookup google.com This will return the IP address of the DNS server used by the system to resolve domain … Read more
The maximum length of arguments in a shell command is dependent on the underlying operating system and the system’s configuration. In most cases, the maximum length of arguments in a shell command is determined by the operating system’s shell and the maximum size of a command line buffer. In most Unix-like systems, the maximum length … Read more
To run the fsck utility to check and repair a Linux file system on a Synology NAS, you need to have access to the command line interface of the device. You can do this by using the ssh command to log into the NAS from a remote computer, or by using the built-in Terminal or … Read more
To change the hostname in CentOS 5/6, you can follow these steps: Open the /etc/sysconfig/network file in a text editor: sudo nano /etc/sysconfig/network Change the HOSTNAME value to the desired hostname: HOSTNAME=new_hostname Save the file and close the editor. Restart the network service to apply the changes: sudo /etc/init.d/network restart Verify that … Read more
To set the PATH environment variable in the TCSH/CSH shell, you can use the following syntax: set path = (dir1 dir2 dir3 …) Replace dir1, dir2, dir3, etc., with the directories you want to include in the PATH. For example, to add the /usr/local/bin directory to the PATH, you can use the following command: … Read more