As you suspected, /etc is from etcetera, unhelpfully named for "where everything else goes", and /usr was for "user applications". A lot of the detail on the history of the Filesystem Hierarchy …

What is the rationale for the "unix system resources", or /usr directory, as described here, which duplicates many of the directory names under the root directory /? My purpose: I'm installing …

This is a part where the FHS is slightly self-contradictory, as /usr is defined to be read-only, but /usr/local needs to be read-write for local installation of software to succeed. The SVR4 file …

Nov 3, 2015 · 125 /usr/local/bin is for programs that a normal user may run. The /usr/local hierarchy is for use by the system administrator when installing software locally. It needs to be …

24 Some kind of "update" on this issue: Recently some Linux distributions are merging /bin into /usr/bin and relatedly /lib into /usr/lib. Sometimes also (/usr)/sbin to /usr/bin (Arch Linux). So …

Notice how /usr/local starts with backslash ? There's root directory from which you can access other directories; the image to keep in mind is the root directory is where root starts, and …

You cannot put spaces around the = sign when you do: export foo=bar Remove the spaces you have and you should be good to go. If you type: export foo = bar the shell will interpret that as …

To also come back to what you tried first, the shebang line #!/usr/bin python3 is of course wrong. It tries to execute the file /usr/bin with python3 and the filename of your script as arguments. …

Mar 12, 2010 · Major use case of env: pyenv and other version managers One major use case of why you should use #!/usr/bin/env python instead of just /usr/bin/python is that of version …

Oct 9, 2010 · No, they are not always under /usr/share/zoneinfo. NixOS has them under /etc/zoneinfo, but it sets the TZDIR environment variable to point there, following the glibc …