Reverse commands, and extensions

[Fuzzy_duck]

This might seem a stupid question, but since I'm a novice, please bear with me.
Is the fallowing command : $ rm -ri dir1 the same with $ rm -ir dir1 ? Or is there some sort of hierarchy?

Also, what are the executables extensions in Linux (the equivalents of .exe , .com and .bat .)?

Thank you.

[Irithori]

Most programs -but not all- do not care in which order the options are given.
In your rm case, it makes no difference.

In doubt, read the manual page for the command.

man rm

There are no executeable extensions.
A file can be arbitrarily named and still be executeable.

However -as a basis- it needs the x-bit set for either the desired user, desired group or others.
Filesystem permissions - Wikipedia, the free encyclopedia

If you call a ELF binary file with x-bit, the program loader will load the program ( oh really? ) into memory and jump to the program entry point.

If it is a textfile with a valid shebang, then the program given in that shebang (bash, perl, python, whatever) is started with the textfile as argument.

As a third possibilty, there is the binfmt_misc mechanism, that is more flexible compared to shebang, as it also works with non-textfiles.

[Fuzzy_duck]

Thank you very much!