Easiest way to modify multiple filenames all at once?

[sponge]

Hi all,

I have multiple files that look like these:

ImgA.1
ImgA.2
ImgA.3
..........
ImgA. 99

Could you suggest me options to replace A by B and increase the numbering by 100 so that they end up looking like these ones?

ImgB.101
ImgB.102
ImgB.103
.........
ImgB.199

Thanks a lot!
Cheers

[atreyu]

Hello and welcome!

I've moved your post to the Programming/Scripting forum where it will hopefully get more attention.

[sponge]

sounds good, thanks!

[atreyu]

Hi all,

I have multiple files that look like these:

ImgA.1
ImgA.2
ImgA.3
..........
ImgA. 99

Could you suggest me options to replace A by B and increase the numbering by 100 so that they end up looking like these ones?

ImgB.101
ImgB.102
ImgB.103
.........
ImgB.199

Thanks a lot!
Cheers

Hi,

Is this a homework question? It appears to be so, which is against Forum Rules.

[sponge]

Nop,
it has nothing to do with homework, just wanted to ask for suggestions in the forum so I know how to deal with it the next time.

[atreyu]

well, then i guess it's okay ;)

there are many ways to do this. for example, some awk gurus could probably do it all in one-liner...but here's how I'd do it:

#!/bin/bash
files=$(ls ImgA.[0-9]*)
for file in $files; do
  num=$(echo $file|cut -f2 -d.)
  newnum=$(( $num + 100 ))
  newfile=$(echo $file|sed -e "s|^ImgA\.$num$|ImgB.$newnum|")
  echo mv $file $newfile
done

[sponge]

Thanks a lot Atreyu.Sorry for more questions, im quite a newbie. Is it [0-9] in the second line required?
Wouldnt it be enough just ImgA.*?

[atreyu]

Thanks a lot Atreyu.Sorry for more questions, im quite a newbie. Is it [0-9] in the second line required?
Wouldnt it be enough just ImgA.*?

As long as you only had files with "ImgA." followed by a number in the directory. The point of the [0-9] regex is to match the number extension explicitly. So yeah, your wildcard notation is probably fine. I just got into the habit of matching on filenames as specifically as possible - it is good practice.

[watael]

hi,

#!/bin/bash

shopt -s extglob nullglob

for f in ./Img.+([0-9]); do echo mv "$f" "${f%.*}.$((${f##*.}+100))"; done

rtfm

[sponge]

well, then i guess it's okay

there are many ways to do this. for example, some awk gurus could probably do it all in one-liner...but here's how I'd do it:

#!/bin/bash
files=$(ls ImgA.[0-9]*)
for file in $files; do
  num=$(echo $file|cut -f2 -d.)
  newnum=$(( $num + 100 ))
  newfile=$(echo $file|sed -e "s|^ImgA\.$num$|ImgB.$newnum|")
  echo mv $file $newfile
done

So I ran into another problem. The files that I need to modify are numbered so that they start:

001
002
003
and so on...

I adapted your script and executed it but im getting this issue:

' value too great for base '

which seems to be due to incompatibility with the C language octal notation?

Would it make sense to make a bash version of this script or would I run into the same problem?
Thanks!