renaming extensions
 

i am very new in linux and hoping that i am able to get help here...can i know when we can't rename extensions by simply typing mv *.cpp *.c?

Not sure but I think you need to be more specific with that renaming. like "mv baa.cpp baa.c". I'm myself not that familiar with linux. Also, check file permissions.

No. "mv" moves a bunch of files to one destination, so if you tried to do that it would try to move all the *.cpp and all but the last of the *.c files into the last .c file, which is not what you want (and does not work). Try something like

thank you for solving the problem.
but if you don't mind can you explain how the code works? like why there are 3 arguments?

and what does this mean?

read "man rename"

So "mv" works like this: suppose you do "mv A B C D E F", it tries to move the 5 things (A B C D E) into the directory F. When you do "mv *.cpp *.c", the shell expands the wildcards, so it becomes something like "mv A.cpp B.cpp C.cpp D.c E.c F.c" for example. Then it tries to move the 5 things (A.cpp B.cpp C.cpp D.c E.c) into the directory "F.c". Which is not what you wanted.

thank you so much...i understand it clearly now..i appreciate it :)

thank you so much...i understand it clearly now..i appreciate it :)