backtick quoted execution (``, qx) ck_null t%
# glob defaults its first arg to $_
-glob glob ck_glob t@ S? S?
+glob glob ck_glob t@ S?
readline <HANDLE> ck_null t%
rcatline append I/O operator ck_null t%
link link ck_fun isT@ S S
symlink symlink ck_fun isT@ S S
readlink readlink ck_fun stu% S?
-mkdir mkdir ck_fun isT@ S S
+mkdir mkdir ck_fun isT@ S S?
rmdir rmdir ck_fun isTu% S?
# Directory calls.