delete last character of filenames in a folder [closed] - sed

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I have a folder that contains some text files. I need to delete the last character of each filename in this folder. filenames are shown below.
1ADFG.txt
RG25A.txt
5SDFC.txt
Desired output
1ADF.txt
RG25.txt
5SDF.txt

Answer 1

I would do like this:
for i in *.txt; do echo "mv '$i' '${i/?.txt}.txt'"; done
If the output looks good, then pipe it to | sh, that is:
for i in *.txt; do echo "mv '$i' '${i/?.txt}.txt'"; done | sh

Answer 2

This
awk 'BEGIN {FS="."} {print substr($1,1,length($1)-1) "." $2;}'
feeded with the list of the names should do the job, provided that there's only 1 dot, the one for the extension.

Answer 3

You could also use sed like this :
$ ls -1
1ADFG.txt
5SDFC.txt
RG25A.txt
$ ls -1|sed "s/\([A-Za-z0-9]\{4\}\)[A-Za-z0-9]*\(\.[A-Za-z0-9]\)/\1\2/g"
1ADF.txt
5SDF.txt
RG25.txt

Answer 4

another way is to use the perl rename utility:
$ rename -n 's/.\./\./' *.txt
1ADFG.txt renamed as 1ADF.txt
5SDFC.txt renamed as 5SDF.txt
RG25A.txt renamed as RG25.txt