cfn

#!/bin/sh
#
# cfn -- Change FileName
#
# Adds either a prefix or a suffix to files.
#
# Check for at least 3 options: 1 for prefix or suffix, 1 for the actual prefix
# or suffix, and at least one for a file.
if [[ $# -lt 3 ]] || [[ $1 != "--suffix" && $1 != "--prefix" ]]; then
    echo Usage: cfn [--suffix] suffix [--prefix] prefix [file1, file2, ...]
    exit 1
fi

prefix_or_suffix=$2
files="${@:3}"

for file in $files; do
    dirname=$(dirname $file)
    basename=$(basename $file)
    extension="${basename##*.}"
    filename="${basename%.*}"
    if [[ $1 = "--prefix" ]]; then
        mv $file "$dirname/$prefix_or_suffix$filename.$extension"
    else
        mv $file "$dirname/$filename$prefix_or_suffix.$extension"
    fi
done