如何检查文件夹中的所有文件是否具有相同的格式



我有一个文件夹,其中包含文件列表。问题是他们没有扩展。我想检查它们是 JPEG 格式还是 JPG 格式。我试过这个

find folder -type f -not -name "*.*"

输出为

folder/t351
folder/t352
folder/t353
folder/t354
folder/t355

我尝试使用正则表达式,但由于文件名没有扩展名,因此无法解决。有人可以告诉我如何验证文件并检查它们是否具有某种格式。

您应该使用 file 命令。我向你推荐一个可以优化的快速代码:

for f in directory
do
    isJPEG=$(file $f | grep JPEG)
    if [ -n "$isJPEG" ]; then
       echo $f
    fi
done

这个怎么样?

PROMPT> ls * | sed 's/^.*$/"&"/g' | xargs file
IREffectFilter.m:                                        ASCII C++ program text, with CRLF line terminators
MacBook Air.spx:                                         XML  document text
PGFilteredImageView.m:                                   ASCII C++ program text
Screen Shot 2012-09-27 at 1.33.50 PM.png:                PNG image data, 559 x 152, 8-bit/color RGB, non-interlaced
Screen Shot 2012-10-02 at 10.04.37 AM.png:               PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-02 at 2.08.53 PM.png:                PNG image data, 937 x 1158, 8-bit/color RGB, non-interlaced
Screen Shot 2012-10-03 at 9.50.16 AM.png:                PNG image data, 651 x 347, 8-bit/color RGB, non-interlaced
Screen Shot 2012-10-08 at 11.14.51 AM.png:               PNG image data, 1343 x 1528, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-08 at 12.09.01 PM.png:               PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-08 at 12.29.16 PM.png:               PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-09 at 8.44.05 AM.png:                PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-11 at 4.17.14 PM.png:                PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
breakpoint1.sh:                                          Bourne-Again shell script text executable
breakpoint2.sh:                                          Bourne-Again shell script text executable
bugtracker.txt:                                          UTF-8 Unicode text
error_svn_rename.txt:                                    UTF-8 Unicode English text
long_text.txt:                                           data

尝试ls | grep -v '.' |file -f - . 例如,在显示ls的目录中

  2 ga()    ab cd  date.txt  ga() mo  times  x?gh

file *节目

  2 ga()  : ASCII text, with very long lines
  ab cd:       empty
  date.txt:    ASCII text
  ga() mo:     PDF document, version 1.5
  times:       HTML document, ASCII text
  x?gh:        JPEG image data, JFIF standard 1.01

命令管道

ls | grep -v '.' |file -f -显示

  2 ga()  :           ASCII text, with very long lines
  ab cd:     empty
  ga() mo:       PDF document, version 1.5
  times:     HTML document, ASCII text
  x?gh:    JPEG image data, JFIF standard 1.01

(显然file -在这个例子中输出了行内的额外制表符或空格。 请注意,第一个文件名的末尾有两个空格,如冒号前的空格所示。 另请注意,命令

ls | grep -v '.' |file -f - |grep -i jpeg产生:

  x?gh:    JPEG image data, JFIF standard 1.01

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