# Homebrew ## Identification [[iTerm2|iTerm2]], [[Homebrew|Homebrew]], Bash, Zsh, and Fish form a macOS/Linux command-line environment. `drwxr-xr-x+` denotes a directory with owner/group/other permission triples and extended ACLs (`+`). `chmod 777` grants all permission bits to everyone and is rarely an appropriate fix. ## Notebook evidence - [[Scanned_20260730-1719#PDF page 58 — Shell navigation and Unix permission bits|PDF page 58: Shell navigation and Unix permission bits]] — This is a learning page translating symbolic permissions into user/group/other roles. It supplies the user-space access-control knowledge needed before manipulating boot files or system directories. ## Relationships and overlays The source places this note in a shared evidence cluster with [[iTerm2|iTerm2]]. Within the larger collection, this evidence extends [[Vendor-Agnostic Recovery|vendor-agnostic recovery]] and [[Continuity Architecture|continuity architecture]] by showing how software, hardware, identity, and pre-OS control depend on recoverable interfaces. ## Evidentiary status and open leads Add ACLs, ownership, `umask`, safe recursive use, and least privilege. Replace “777 all” with task-specific examples. ## Source - [[Scanned_20260730-1719|Scanned_20260730-1719]]