how to rename files in one folder - with commandline

[Maze]

good day dear php-freaks

 

 

i need to rename files in _ one _ directory  - more than 50 files are in this..folder:

 

the files are named like so:
01
02
03
04
...
49
50

each file has got a number as a file name.

each file should get a character

- like so: r01, r02, r03, r04 and so on . .... r50

how can we do this on commandline
 

 

[benanamen]

Command line of what? Are you on Windows or Linux?

[ignace]

Right off the bat, something like:

 

for file in $(ls -A); do mv $file 'r'$file; done;