title: Are shell aliases POSIX compliant?
body: <p>I am writing a utility which lets you set shell aliases persistently.</p>
  
  <p>I have it in my head that unix shell aliases are POSIX compliant, but I can't remember where I heard this and my google fu has not yielded any definitive answer.</p>
  
  <p>Most of my experience is with zsh and bash.</p>
  
  <p>Is it safe to assume that if I write aliases in the format of specified by both bash and zsh, that I'll be able to port this format over to other shells?</p>