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  2. PATH (variable) - Wikipedia

    en.wikipedia.org/wiki/PATH_(variable)

    PATH is an environment variable on Unix-like operating systems, DOS, OS/2, and Microsoft Windows, specifying a set of directories where executable programs are located. In general, each executing process or user session has its own PATH setting.

  3. Unix filesystem - Wikipedia

    en.wikipedia.org/wiki/Unix_filesystem

    /bin: Stands for binaries and contains certain fundamental utilities, such as ls or cp, that are needed to mount /usr, when that is a separate filesystem, or to run in one-user (administrative) mode when /usr cannot be mounted. In System V.4, this is a symlink to /usr/bin. Otherwise, it needs to be on the root filesystem itself. /boot

  4. Filesystem Hierarchy Standard - Wikipedia

    en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard

    /usr: Secondary hierarchy for read-only user data; contains the majority of user utilities and applications. Should be shareable and read-only. [9] [10] /usr/bin: Non-essential command binaries (not needed in single-user mode); for all users. /usr/include: Standard include files. /usr/lib: Libraries for the binaries in /usr/bin and /usr/sbin ...

  5. cd (command) - Wikipedia

    en.wikipedia.org/wiki/Cd_(command)

    The user can use this indirection to access subdirectories too. So, from /usr/bin/tmp, they can use cd ../../local to go to /usr/local; cd - will switch the user to the previous directory. For example, if they are in /usr/bin/tmp, and go to /etc, they can type cd - to go back to /usr/bin/tmp.

  6. Sticky bit - Wikipedia

    en.wikipedia.org/wiki/Sticky_bit

    For example, to add the bit on the directory /usr/local/tmp, one would type chmod +t /usr/local/tmp. Or, to make sure that directory has standard tmp permissions, one could also type chmod 1777 /usr/local/tmp. To clear it, use chmod -t /usr/local/tmp or chmod 0777 /usr/local/tmp (the latter will also reset the tmp directory to standard ...

  7. Path (computing) - Wikipedia

    en.wikipedia.org/wiki/Path_(computing)

    A path (or filepath, file path, pathname, or similar) is a string of characters used to uniquely identify a location in a directory structure.It is composed by following the directory tree hierarchy in which components, separated by a delimiting character, represent each directory.

  8. pushd and popd - Wikipedia

    en.wikipedia.org/wiki/Pushd_and_popd

    If pushd is not provided with a path argument, in Unix it instead swaps the top two directories on the stack, which can be used to toggle between two directories. The popd command removes (or 'pops', in the stack analogy) the current path entry from the stack and returns to the path at the top of the stack as the new working directory. [4] [5]

  9. Shebang (Unix) - Wikipedia

    en.wikipedia.org/wiki/Shebang_(Unix)

    More broadly using #!/usr/bin/env for any script still has some portability issues with OpenServer 5.0.6 and Unicos 9.0.2 which have only /bin/env and no /usr/bin/env. Using #!/usr/bin/env results in run-time indirection, which has the potential to degrade system security; for this reason some commentators recommend against its use [ 17 ] in ...