How to remove all not single files Linux directory?

Question

I have duplicated files in directory on Linux machine which are listed like that:

ltulikowski@lukasz-pc:~$ ls -1
abcd
abcd.1
abcd.2
abdc
abdc.1
acbd

I want to remove all files witch aren't single so as a result I should have:

ltulikowski@lukasz-pc:~$ ls -1
acbd

Answer 1

The function uses extglob, so before execution, set extglob: shopt -s extglob

rm_if_dup_exist(){ 
    arr=()
    for file in *.+([0-9]);do
        base=${file%.*};
        if [[ -e $base ]]; then
            arr+=("$base" "$file")
        fi
    done
    rm -f -- "${arr[@]}"
}

This will also support file names with several digits after the . e.g. abcd.250 is also acceptable.

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Usage example with your input:

$ touch abcd abcd.1 abcd.2 abdc abdc.1 acbd
$ rm_if_dup_exist
$ ls
  acbd

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Please notice that if, for example, abcd.1 exist but abcd does not exist, it won't delete abcd.1.