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  • ` Renaming: 0020_000834.png => 000834_0020.png Renaming: 0020_000835.png => 000835_0020.png Renaming: 0020_000836.png => 000836_0020.png Renaming: 00xx_000xxx_t.png => 000xxx_t_00xx.png Renaming: t_0000_000000.png => 0000_000000_t.png Renaming: t_0000_000001.png => 0000_000001_t.png Renaming: t_0000_000002.png => 0000_000002_t.png ` Commented Aug 1, 2018 at 14:16
  • so for the t files it worked, for the others not Commented Aug 1, 2018 at 14:16
  • oh yes it worked well when my assumptions would have been correct... it seems they were wrong. Is always just t_ the prefix ? Commented Aug 1, 2018 at 14:18
  • the folder contains files with t_ and files with not, so I need to perform this operation on only files with t_ ... I would say that I replace this for f in *.png; do with for f in t_*.png; do, right ? or what do you think ? Commented Aug 1, 2018 at 14:20
  • that would work, yes! Commented Aug 1, 2018 at 14:21