China DOS Union

Originally posted by bjsh at 2007-4-13 10:10 PM:
Create a 10.pdf in the C drive.

Execute the following two commands;

See what 10.pdf is renamed to in the end/

ren 10.pdf *2.c
The result is: 10.pdf2.c

ren 10.pdf *1.c
The result is 1.c

ren 10.pdf *2.c

What is the first character after *?
2

Is there this character in 10.pdf?
No. So, it is appended at the end

10.pdf
2.c

10.pdf2.c

ren 10.pdf *1.c

What is the first character after *?
1

Is there this character in 10.pdf?
Yes. Find the first one from the end, and align

10.pdf Delete after 1
1.c Append after 1
1.c

ren 10010.pdf *1.c

What is the first character after *?
1

Is there this character in 10010.pdf?
Yes. Find the first one from the end, and align

10010.pdf Delete after 1
1.c Append after 1
1001.c

Special case ren * *.
ren * "* "


FAT32

C:\TEST>cd.>123...456...789.mp3

C:\TEST>dir/b
123...456...789.mp3

C:\TEST>ren * *.

C:\TEST>dir/b
123...456...789

C:\TEST>ren * *.

C:\TEST>dir/b
123

---
C:\TEST>cd.>"123 456 789.mp3"

C:\TEST>dir/b
123 456 789.mp3

C:\TEST>ren * "* "

C:\TEST>dir/b
123

C:\TEST>for %a in (*) do @echo "%a"
"123"

NTFS

D:\TEST>cd.>123...456...789.mp3

D:\TEST>dir/b
123...456...789.mp3

D:\TEST>ren * *.

D:\TEST>dir/b
123...456...789

D:\TEST>ren * *.

D:\TEST>dir/b
123...456

D:\TEST>ren * *.

D:\TEST>dir/b
123

---
D:\TEST>cd.>"123 456 789.mp3"

D:\TEST>dir/b
123 456 789.mp3

D:\TEST>ren * "* "

D:\TEST>dir/b
123 456

D:\TEST>for %a in (*) do @echo "%a"
"123 456"

D:\TEST>ren * "* "

D:\TEST>dir/b
123

D:\TEST>for %a in (*) do @echo "%a"
"123"

[ Last edited by mkd on 2008-4-28 at 05:42 PM ]

What a wonderful thing!