igli 1193056042 learn See "Special Parameters and Variables" in http://wooledge.org/mywiki/BashGuide or search: man bash /Special Parameters
igli 1220971467 forget
igli 1220971492 learn See: http://wooledge.org:8000/BashGuide/TheBasics/Parameters or search: man bash /Special Parameters
greycat 1269540629 forget
greycat 1269540659 learn Special Parameters are read-only pseudo-variables, such as $$ (PID), $! (bg child PID), etc. See http://mywiki.wooledge.org/BashGuide/Parameters