If you want to suppress non-complaint behavior, set the POSIXLY_CORRECT environment variable. You can also specify the version of POSIX to comply with, because

If you want to suppress non-complaint behavior, set the POSIXLY_CORRECT environment variable. You can also specify the version of POSIX to comply with, because the standards aren't always standard. https://www.gnu.org/software/coreutils/manual/html_node/Standards-conformance.html https://www.gnu.org/software/coreutils/manual/html_node/Stan... https://www.gnu.org/software/coreutils/faq/coreutils-faq.html https://www.gnu.org/software/coreutils/faq/coreutils-faq.htm... I would hope your cross-shell scripts are also conforming to a certain shell script language, and are also resetting all environment factors which change the function of various commands. Not that endianness is ever a worry with a shell script ............ (Also note that POSIX supports printf, which you can use to insert any character string you like, basically)