I have a commercial application which I cannot install. Application output: Type your choice: [ 2 ] 4 sort: invalid option -- 3 Try `sort --help' for more information. sort: invalid option -- 3 Try `sort --help' for more information. Loading appropriate product installation information... It works if I use /bin/sort from FC4. I was not able to find exact command line which causes this.
What about if you do this first?: export _POSIX2_VERSION=199209
It works then.
Then the commercial application needs porting to POSIX-200112. See this info page: info coreutils "Standards Conformance"