Unix Standard (6)

• The GNU Bourne-Again Shell (tiswww.case.edu) tool
  GNU Bash upstream home: POSIX shell implementation, releases, patches and manual, GPLv3
  Command Line Shell Scripting #
• Shell Command Language (pubs.opengroup.org) reference
  POSIX.1-2024 normative definition of sh: token recognition, word expansion, redirection, compound commands
  Command Line Shell Scripting #
• Linux man pages online (man7.org) reference
  HTML renderings of the man-pages project plus curated pages from other free software projects
  Command Line Kernel #
• The Austin Common Standards Revision Group (opengroup.org) reference
  Joint IEEE/ISO/Open Group body drafting POSIX and Base Specifications revisions; draft status news
  Governance #
• FHS Referenced Specifications (refspecs.linuxfoundation.org) reference
  Downloadable FHS 3.0 and 2.3 texts fixing where files belong in the directory tree; 3.0 dates to 2015
  Filesystem #
• musl libc (musl.libc.org) tool
  Small standards-conformant C library over the Linux syscall API; static-friendly, with CVE advisories
  libc #