chmod:tldr:f46cd

The command "chmod a+rx ${filename}" is used to change the permission settings of a file or directory in a Unix-like operating system.

Here is the breakdown of the command and its various components:

• "chmod" is a command used to change the file or directory permissions.
• "a" is short for "all" and refers to all users: the owner (u), the group (g), and others (o).
• "+" is used to add the specified permissions.
• "rx" stands for "read" and "execute" permissions. It grants the permission to read and execute the file.
• "${filename}" is a placeholder which should be replaced with the actual name of the file or directory you want to modify.

So, when you run the command "chmod a+rx ${filename}", it adds the read and execute permissions for all users on the specified file or directory. This means that everyone can read the file's contents and execute it if it's a script or a binary executable.