usrlocalbin

The directory /usr/local/bin is a standard subdirectory in the root of Unix-like operating systems used to store executable programs that are locally installed by the administrator rather than part of the core OS distribution. It is a key element of the Filesystem Hierarchy Standard (FHS) and is intended to be writable by root and contain architecture-specific binaries.

It commonly hosts scripts and compiled programs installed from source, binaries obtained from third-party vendors, or package manager installations that place executables in this location. Files there should be independent of the distribution's package manager to avoid conflicts during system upgrades.

The environment PATH usually includes /usr/local/bin, often ahead of /usr/bin and /bin. This means a program named foo found in /usr/local/bin will be executed in preference to a similarly named binary in the system directories. If needed, users can modify PATH.

The directory is typically owned by root with permissions such as 755; installation of new binaries should be performed with appropriate privileges. In multi-user environments, it may be prudent to maintain proper checks to avoid inadvertently overriding system utilities.

On macOS, Homebrew commonly uses /usr/local/bin for user-installed software. On some distributions, the directory may be absent or empty until created. The name often appears as "usr local bin" in documentation without slashes.