$ rm 1
rm: cannot remove `1': No such file or directory

$ perl -e " stat 1; printf qq[%d %s %d\n], $!,$!,-$!;
2 No such file or directory -2

$ perl -e " $!=0; stat 1; printf qq[%d %s %d\n], $!,$!,-$!;
2 No such file or directory 0

$ perl -e " $!=2; stat 1; printf qq[%d %s %d\n], $!,$!,-$!;
2 No such file or directory -2

$ perl -e " $!=1; stat 1; printf qq[%d %s %d\n], $!,$!,-$!;
2 No such file or directory -1