Usr.php

What do the abbreviations "etc" and "usr" mean? - Ask Ubuntu

I can relate to acronyms and abbreviations much more readily when I actually know how they were derived. It is oftn pssble to wrk out wht an abrvtion means if you know the the root words behind it....

What is the rationale for the `/usr` directory? - Ask Ubuntu

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 Ora...

What is the difference between /opt and /usr/local?

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 system standard, which was the FHS' main source of inspiration, recommends avoiding /usr/local and using /opt instead to overcome this issue.

What is /usr/local/bin? - Unix & Linux Stack Exchange

124 /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 safe from being overwritten when the system software is updated. It may be used for programs and data that are shareable amongst a group of hosts, but not found in /usr.

filesystem - How to Fix "Read-only file system" error when I run ...

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filesystem - bin.usr-is-merged, lib.usr-is-merged, sbin.usr-is-merged ...

As part of this change, to work around some potential package management problems, these <x>.usr-is-merged directories are created. M4: Protective diversions for aliasing links For each of the aliasing symbolic links, we can introduce a diversion that redirects it to some unimportant location.

/usr/bin/env: ‘python3\\r’: No such file or directory

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. This must obviously fail because /usr/bin is a directory and no executable file.

login - PAM unable to dlopen (pam_lastlog.so) /usr/lib/security/pam ...

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How to add the APT key for Microsoft packages - Ask Ubuntu

I've read that it's now recommended not to trust these keys globally but just for the packages they sign. So, the signed-by makes sense to keep and rather put the key under /usr/share/keyrings

command line - What is the meaning of "usr"? - Ask Ubuntu

Note that the quote mentions the /usr directory should be read-only and not modifiable by programs, which applies to /usr/lib because it contains shared libraries which are critical for proper functionality of applications.