复制文件时将固定子字符串移动到文件名的末尾

for file in MyTest*.*; do    # iterate over files that start with MyTest and have a .
  ext=${file##*.}            # remove everything before the last . to get the extension
  basename=${file%.*}        # remove everything *after* the last . to get the "basename"
  new_basename=${basename#MyTest}      # remove the prefix to get the *new* basename
  new_file="${new_basename}Test.$ext"  # combine that prefix with the "Test" suffix & ext.
  [[ -e $new_file ]] || cp -- "$file" "$new_file"  # copy if result does not already exist
done

${file##*.},${file%.*}和${basename#MyTest}是参数扩展的示例，删除前缀和后缀。