os_specific

unset HELLO=
unset  A-
export HELLO=123 A- WORLD=456
unset  HELLO A- WORLD
export UNO=1 DOS-2 TRES=3 || env | grep TRES
export | sort | grep -v SHLVL | grep -v "declare -x _" | grep -v "PS.="
exit 9223372036854775807
exit 9223372036854775808
exit -9223372036854775807
exit -9223372036854775808
exit -9223372036854775809