ar:tldr:2f5e2

ar: E[x]tract all members from an archive.

$ ar x ${filename-a}

try on your machine

The command "ar x ${filename-a}" is written in a shell scripting language and is used to extract files from an archive created with the "ar" command.

Here's what each part of the command means:

"ar": This is a command-line utility in Unix-like operating systems used to create, modify, and extract files from archives.
"x": This is an option of the "ar" command, which specifies that the files should be extracted from the archive.
"${filename-a}": This is a variable in the shell scripting language. The variable "filename" is being used, and the "-a" part is a default value for the variable if it is undefined or empty. This means that if the variable "filename" is not set, the default value "-a" will be used.

So, the command "ar x ${filename-a}" essentially means to extract files from an archive using the "ar" command, with the filename being specified by the variable "filename" (or defaulting to "-a" if the variable is not set).

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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