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USR    
User. The "/usr" directory hierarchy on {Unix} systems. Once
upon a time, in the early days of Unix, this area actually
held users' home directories and files. Since these tend to
expand much faster than system files, /usr would be mounted on
the biggest disk on the system. The root directory, "/" in
contrast, contains only what is needed to {boot} the {kernel},
after which /usr and other disks could be mounted as part of
the multi-user start-up process.

/usr has been used as the "everything else" area, with many
"system" files such as compiler libraries (/usr/include,
/usr/lib), utilty programs (/usr/bin, /usr/ucb), games
(/usr/games), local additions (/usr/local), manuals
(/usr/man), temporary files and queues for various {daemons}
(/usr/spool). These optional extras have grown in size as
Unix has evolved and disks have dropped in price. Under later
versions of {SunOS}, the user files have fled /usr altogether
for a new "/home" {partition} and temporary files have moved
to "/var". This allows /usr to be mounted read-only with some
gain in security and performance since access times are not
updated for files on read-only file systems.


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英文字典中文字典相关资料:


  • 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
  • command line - What is the meaning of usr? - Ask Ubuntu
    usr nowadays stands for User System Resources This directory contains most commands and executables files, libraries and documentation In the early days of Unix, it was the directory where the users' home directories were placed (your user home directory would have been usr anatoly which now is home anatoly), so originally it stood for User See Chapter 1 Linux Filesystem Hierarchy for
  • What is usr local bin? - Unix Linux Stack Exchange
    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 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
  • 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
  • Differences between home, root and usr - Unix Linux Stack Exchange
    To help me understand the usages between home, root, usr local, usr bin and opt, I still have a question because I'm a little confused understanding the differences between each of them
  • usr bin vs usr local bin on Linux - Unix Linux Stack Exchange
    In the late 1970s, usr bin was integrated into the OS base distribution and people started to use usr local bin for the purpose of the previous open usr bin
  • 13. 04 - Where is usr local? - Ask Ubuntu
    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 everything else is branching form it How to access the folder you need:
  • What does #! usr bin . . . at the start of a file mean?
    5 If your file is hello hs, and the first line is "#! usr bin runghc", then the shell will execute: usr bin runghc hello hs That first line basically tells the shell what to use to run the script As for the java example, the first line should be the executable that runs the script, not that compiles the script
  • python - Purpose of #! usr bin python3 shebang - Stack Overflow
    418 #! usr bin python3 is a shebang line A shebang line defines where the interpreter is located In this case, the python3 interpreter is located in usr bin python3 A shebang line could also be a bash, ruby, perl or any other scripting languages' interpreter, for example: #! bin bash
  • linux - What is the difference between #! usr bin env bash and . . .
    #! usr bin env bash #lends you some flexibility on different systems #! usr bin bash #gives you explicit control on a given system of what executable is called In some situations, the first may be preferred (like running python scripts with multiple versions of python, without having to rework the executable line) But in situations where security is the focus, the latter would be preferred





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