没有扩展名的bash文件添加扩展名

Question

I am trying to write a very simple bash script in order to add a file extension (.java) to a bunch of files that have no extension.

If they had an extensions (say .txt) I'd do this:

#!/bin/bash
for file in `*.txt`; 
do mv $file $file.java; 
done

My files, however, don't have an extension. How do I make the loop? I tried *. with no luck.

Thank you.

Answer 1

#!/bin/bash
for file in *; do
  mv "$file" "$file".java; 
done

If you only want to move files that do not already have an extension, try:

#!/bin/sh
for file in *; do
  test "${file%.*}" = "$file" && mv "$file" "$file".java;
done

Note that all of the double-quotes above are superfluous if your filenames are reasonable.

Answer 2

ls -1 | nawk '/.txt/{old=$0;gsub(/.txt/,".txt.java",$0);system("mv \""old"\" "$0)}'

从这里更新了答案

Answer 3

#!/bin/bash
for file in *.txt ; do mv $file `echo $file | sed 's/\(.*\.\)txt/\1java/'` ; done

Answer 4

尝试：

find . -maxdepth 1 -type f | sed 's/^\.\///; /\./d' | while read x; do mv "$x" "$x.java"; done