如何从shell命令中删除目录中的每个其他文件？

Question

I have extracted frames from a video in png format:

00000032.png
00000033.png
00000034.png
00000035.png
00000036.png
00000037.png

and so on...

I would like to delete every other frame from the dir using a shell command, how to do this?

EDIT

I think I wasn't clear in my question. I know I can delete each file manually like:

rm filename.png
rm filename2.png

etc...

I need to do all this in one command dynamically because there are thousands of images in the folder.

Answer 1

This should do the trick:

rm -f *[13579].png

which would exterminate every file which name ends with "1" or "3" or "5" or "7" or "9" plus trailing ".png".

Note: * used in pattern stands for 0 or more characters so 1.png will match but so would foo1.png

Answer 2

delete=yes
for file in *.png
do
    if [ $delete = yes ]
    then rm -f $file; delete=no
    else delete=yes
    fi
done

This forces strict alternation even if the numbers on the files are not consecutive. You might choose to speed things up with xargs by using:

delete=yes
for file in *.png
do
    if [ $delete = yes ]
    then echo $file; delete=no
    else delete=yes
    fi
done |
xargs rm -f

Your names look like they're sane (no spaces or other weird characters to deal with), so you don't have to worry about some of the minutiae that a truly general purpose tool would have to deal with. You might even use:

ls *.png |
awk 'NR % 2 == 1 { print }' |
xargs rm -f

There are lots of ways to achieve your desired result.

Answer 3

rm ???????1.png
rm ???????3.png
rm ???????5.png
rm ???????7.png
rm ???????9.png

(but make a backup before you try it!). Replace "rm" with "erase" for dos/windows.

Answer 4

假设每隔一个意味着文件的结尾数字为1,3,5,7或9，那么这就解决了你的问题

find . -regex '.*[13579]\.png' -exec rm {} \;

Answer 5

Other than what? You can use * to delete multiple frames. For example rm -f *.png to delete all.

Answer 6

This small script remove all png files:

$ find . -name "*.png" -exec /bin/rm {} \;

Pay attention to the dot , it means current directory.

It's the same, but more secure:

$ find . -name "*.txt" -delete:

Now, remove all files that does not have png extension:

$ find  . ! -name "*.png" -type f -delete