jani@sargeX:~/tmp/conan$ ls
tvtime-output-23:50:49.png
tvtime-output-23:51:02.png
tvtime-output-23:51:22.png
tvtime-output-23:51:32.png
tvtime-output-23:51:37.png
tvtime-output-23:52:07.png
tvtime-output-23:53:00.png
tvtime-output-23:53:11.png
tvtime-output-23:53:39.png
tvtime-output-23:53:42.png
tvtime-output-23:54:11.png
tvtime-output-23:54:27.png
tvtime-output-23:54:43.png
tvtime-output-23:55:27.png
tvtime-output-23:55:30.png
tvtime-output-23:55:33.png
tvtime-output-23:55:41.png
tvtime-output-23:55:54.png
jani@sargeX:~/tmp/conan$ for i in * ; do \
> echo mv $i `echo $i | tr [:] [_]` >> tee.sh ; done
jani@sargeX:~/tmp/conan$ cat tee.sh
mv tvtime-output-23:50:49.png tvtime-output-23_50_49.png
mv tvtime-output-23:51:02.png tvtime-output-23_51_02.png
mv tvtime-output-23:51:22.png tvtime-output-23_51_22.png
mv tvtime-output-23:51:32.png tvtime-output-23_51_32.png
mv tvtime-output-23:51:37.png tvtime-output-23_51_37.png
mv tvtime-output-23:52:07.png tvtime-output-23_52_07.png
mv tvtime-output-23:53:00.png tvtime-output-23_53_00.png
mv tvtime-output-23:53:11.png tvtime-output-23_53_11.png
mv tvtime-output-23:53:39.png tvtime-output-23_53_39.png
mv tvtime-output-23:53:42.png tvtime-output-23_53_42.png
mv tvtime-output-23:54:11.png tvtime-output-23_54_11.png
mv tvtime-output-23:54:27.png tvtime-output-23_54_27.png
mv tvtime-output-23:54:43.png tvtime-output-23_54_43.png
mv tvtime-output-23:55:27.png tvtime-output-23_55_27.png
mv tvtime-output-23:55:30.png tvtime-output-23_55_30.png
mv tvtime-output-23:55:33.png tvtime-output-23_55_33.png
mv tvtime-output-23:55:41.png tvtime-output-23_55_41.png
mv tvtime-output-23:55:54.png tvtime-output-23_55_54.png