sh-aglib A library of portable (POSIX/SVR4) Bourne-compatible shell functions and macros Resources https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Portable-Shell.html https://www.in-ulm.de/~mascheck/bourne/ https://www.in-ulm.de/~mascheck/various/portability/ http://code.dogmap.org./lintsh/ ...