Incrementing number in filenames in bash - bash

Question

I'm trying to take a list of files and rename them, incrementing a number in their filenames. The directory contains a bunch of files named like:
senreg1.csv senreg2.csv senreg10.csv
senreg1.csv.1 senreg2.csv.1 senreg10.csv.1
senreg1.csv.2 senreg2.csv.2 senreg10.csv.2
senreg1.csv.3 senreg2.csv.3 ... senreg10.csv.3
senreg1.csv.4 senreg2.csv.4 senreg10.csv.4
... ... ...
senreg1.csv.10 senreg2.csv.10 senreg10.csv.10
senreg1.csv.11 senreg2.csv.11 senreg10.csv.11
I want to increment all of the files that end in 3 or higher so I can insert a new file with suffix 3, so I made a text file called 'renames.txt' containing all the filenames that I want to rename. Then, I tried using a for loop to do the actual renaming.
for f in `cat renames.txt`
do
newfile=`echo $f | awk 'BEGIN { FS = "."}; { printf $1 "." $2 "." $3+1 }'`
mv "$f" "$newfile"
done
I want to end up with something like:
senreg1.csv senreg2.csv senreg10.csv
senreg1.csv.1 senreg2.csv.1 senreg10.csv.1
senreg1.csv.2 senreg2.csv.2 senreg10.csv.2
senreg1.csv.4 senreg2.csv.4 ... senreg10.csv.4
senreg1.csv.5 senreg2.csv.5 senreg10.csv.5
... ... ...
senreg1.csv.11 senreg2.csv.11 senreg10.csv.11
senreg1.csv.12 senreg2.csv.12 senreg10.csv.12
But instead I get:
senreg1.csv senreg2.csv senreg10.csv
senreg1.csv.1 senreg2.csv.1 senreg10.csv.1
senreg1.csv.2 senreg2.csv.2 ... senreg10.csv.2
senreg1.csv.12 senreg2.csv.12 senreg10.csv.12
The contents of senregX.csv.12 are the same as the original senregX.csv.3. Hope this explanation made sense. Anybody know what's going on here?

Answer 1

You need to rename the files in reverse.
11 -> 12
10 -> 11
9 -> 10
and so on.

Answer 2

This script do what you want, without temporary files, only to have diversity of solutions:
#!/bin/bash
for file in $(ls -1 *[0-9]) # list files ending with a number
do
# get file name and id
name=$(echo $file | sed 's/\(.*\)\.\([0-9]\+\)$/\1/g');
id=$(echo $file | sed 's/.*\.\([0-9]\+\)$/\1/g');
if [ $id -ge 3 ]
then
((id += 1))
# We need to backup the files because we may override some files
cp $file "_$name.$id"
fi
done
# remove old files
for file in $(ls -1 [!_]*[0-9])
do
id=$(echo $file | sed 's/.*\.\([0-9]\+\)$/\1/g');
if [ $id -ge 3 ]
then
rm $file;
fi
done
# finish
for file in $(ls -1 _*[0-9])
do
name=$(echo $file | tr -d '_');
mv "$file" "$name";
done