> perl -e 'print "result: <",glob("*.txt"),">\n";'
result: <>
> perl -e 'print "result: <",glob("xx.txt"),">\n";'
result: <xx.txt>
> dir > x.txt
> perl -e 'print "result: <",glob("x.txt"),">\n";'
result: <x.txt>
> perl -e 'print "result: <",glob("*.txt"),">\n";'
result: <x.txt>
> perl -e 'print "result: <",glob("xx.txt"),">\n";'
result: <xx.txt>
> dir xx.txt
xx.txt: No such file or directory