To change the hostname (computer name) on a Debian Linux system permanently, you can follow these steps: Open the /etc/hostname file: sudo nano /etc/hostname Replace the existing hostname with your desired hostname. For example: mynewhostname Save and close the file. Open the /etc/hosts file: sudo nano /etc/hosts Find the line that contains your current hostname … Read more
In Korn shell (KSH), you can import variables and functions from a file using the . (dot) command. The . command reads the contents of a file and executes it as if it were part of the current shell. Here’s an example of how you can use the . command to import variables and functions … Read more
To remove a file from a tar archive in Linux or Unix, you can use the tar command with the –delete option. Here’s the basic syntax: tar –delete -f <tar archive file> <file(s) to be deleted> For example, to delete a file named file1.txt from a tar archive my_archive.tar, you can run the following command: … Read more
In Linux/Unix, there are several ways to empty a directory: Using the rm command: rm -rf <directory-name>/* This command will recursively remove all files and subdirectories in the specified directory (<directory-name>). Be cautious when using the rm command, as it can permanently delete files. Using the find command: find <directory-name> -type f -delete This command … Read more
In Linux, you can mount a disk partition using its LABEL instead of its device name. This can be useful when the device name may change (e.g. between reboots), but the LABEL remains constant. To mount a disk partition using its LABEL, you can use the -L option with the mount command, like this: mount … Read more
In bash shell, you can check if a variable is set or not using the following syntax: if [ -z “$VARNAME” ]; then echo “Variable VARNAME is not set.” else echo “Variable VARNAME is set to: $VARNAME” fi Here, the -z option is used with the [ (test) command to check if the value of … Read more
The mplayer media player can be used to play files in a random order using the -shuffle option. The -shuffle option randomly selects files from a given list of files and plays them in the order specified by the random selection. Here’s an example of how you can use the -shuffle option to play a … Read more
The error “passwd: pam_chauthtok(): conversation failure” can occur when attempting to change the password for a user on a Linux system. This error message indicates that there was a problem with the authentication token (password) change process, likely due to a misconfigured PAM (Pluggable Authentication Modules) module. To resolve this issue, you can try the … Read more
The error “memcached: Failed to set rlimit for open files” can occur when starting the memcached service on a Linux system. This error message indicates that the memcached service is unable to set the maximum number of open files (also known as file descriptors) allowed for its process. To resolve this issue, you can try … Read more
The error “network.c:483: error: ‘EC_KEY’ undeclared (first use in this function)” when compiling the lighttpd web server usually indicates that the OpenSSL library on your system is missing the elliptic curve cryptography (ECC) support that lighttpd requires. To resolve this issue, you can try the following steps: Check the version of OpenSSL installed on your … Read more