In Linux and UNIX, there are several ways to empty a directory: Using the rm command: rm -rf /path/to/directory/* This command will remove all files and subdirectories in the specified directory, but it will not remove the directory itself. Using the find command: find /path/to/directory -mindepth 1 -delete This command will recursively search the specified … Read more

In Linux, you can use the mount command to mount a disk partition by its LABEL, rather than by its device name. The LABEL is a human-readable string that is assigned to the partition, and can be used to identify it. Here is an example of how to mount a partition with the LABEL “data” … Read more

In Bash shell, you can use the ${var+x} construct to check if a variable is set or not. If the variable is set, the construct will return the value of the variable, otherwise it will return the string “x”. Here is an example of how to use this construct to check if a variable named … Read more

In MPlayer, you can use the -shuffle command line option to play files in a random order. For example, to play all the files in the current directory in a random order, you can use the following command: mplayer -shuffle * You can also use the -playlist command line option to play files from a … Read more

The “pam_chauthtok(): conversation failure” error can occur when trying to change a user’s password with the passwd command, indicating that the PAM (Pluggable Authentication Modules) module is not able to communicate with the user to verify their identity or to obtain the new password. This can happen for several reasons: The user is not logged … Read more

The “Failed to set rlimit for open files” error can occur when starting the memcached service, indicating that the service is not able to set the maximum number of open files allowed for the system. This can happen for several reasons: The system’s ulimit for open files is set too low: You can check the … Read more

In Debian and Ubuntu Linux, you can set up an NFSv4 file server to share files with other systems on the network. Here are the basic steps to set up an NFSv4 file server: Install the NFS server software by running the following command: sudo apt-get install nfs-kernel-server Create a directory that you want to … Read more

In Linux or Unix, you can use the tty command to find out what terminal you are currently using. The command will display the file name of the terminal connected to the standard input. tty If you are logged in to a terminal session, the command will return the device name of the terminal, such … Read more

In Linux or Unix, you can use the find command with the -name option to search for files that match a specific pattern. To find all files that begin with a dot, you can use the following command: find /path/to/search -name “.*” This command will search the directory specified by /path/to/search (and all its subdirectories) … Read more

In Linux, you can use the mv command to move a folder to a new location. The basic syntax is as follows: mv /path/to/original/folder /path/to/new/location For example, if you want to move a folder named “example” from the home directory to the /var/ directory, the command would be: mv ~/example /var/ Please note that the … Read more