# myshell
Test shell instance which supports:

-myls (same as ls);
-mycp (... cp);
-mymkdir (... mkdir);
-mycat (... cat);
-mymv (... mv);
-mygrep (... grep);
-myrm (... rm);
-mecho (... echo);
-mcd (... cd);
-mexport (... export);
-mpwd (... pwd);
-merrno (... errno);
-mexit (... exit);