fd, xargs, bat = quick document review

fd '.fi.md$':

fd is a program similar to the traditional find command but with a more user-friendly syntax and faster performance. '.fi.md$' is a regular expression. It matches files whose names end with .fi.md. The dollar sign $ in regular expressions signifies the end of a line or string, so this ensures that the command only finds files that exactly end with .fi.md. |:

This is a pipe. It takes the output of the command on its left (the list of files found by fd) and uses it as the input for the command on its right. xargs -I _ -- batcat --paging=always _:

xargs is a command used to build and execute command lines from standard input. -I _ tells xargs to replace occurrences of _ in the initial arguments with names read from standard input (the list of files provided by fd). -- is used to signify the end of command options, after which only positional arguments are accepted. batcat --paging=always _: Here, batcat is likely an alias or a symlink to bat, a command that provides syntax highlighting and Git integration for a variety of file types, and it's an improved version of the cat command. --paging=always ensures that bat always uses a pager (like less) to display the file content, regardless of the size of the file. _ is replaced by each file name from the output of fd. Putting it all together:

The command finds all files ending in .fi.md in the current directory and subdirectories. For each of these files, it then calls batcat (or bat) with the --paging=always option, effectively displaying their contents with syntax highlighting and paging, allowing you to scroll through the content if it's longer than the screen size.