问题描述
我有成千上万个png文件，我想使用pngcrush将其缩小.我有一个简单的find .. -exec作业，但是它是连续的.我的机器上有很多资源，我会并行进行.
I've thousands of png files which I like to make smaller with pngcrush. I've a simple find .. -exec job, but it's sequential. My machine has quite some resources and I'd make this in parallel.
每个png上要执行的操作是:
The operation to be performed on every png is:
pngcrush input output && mv output input
理想情况下，我可以指定并行操作的最大数量.
Ideally I can specify the maximum number of parallel operations.
有没有一种方法可以使用bash和/或其他shell助手来做到这一点?我是Ubuntu或Debian.
Is there a way to do this with bash and/or other shell helpers? I'm Ubuntu or Debian.
推荐答案
您可以使用xargs并行运行多个进程:
You can use xargs to run multiple processes in parallel:
find /path -print0 | xargs -0 -n 1 -P <nr_procs> sh -c 'pngcrush $1 temp.$$ && mv temp.$$ $1' sh
xargs将读取find生成的文件列表(以0个字符(-0分隔))，并一次使用一个参数(-n 1)运行提供的命令(sh -c '...' sh). xargs将并行运行<nr_procs>(-P <nr_procs>).
xargs will read the list of files produced by find (separated by 0 characters (-0)) and run the provided command (sh -c '...' sh) with one parameter at a time (-n 1). xargs will run <nr_procs> (-P <nr_procs>) in parallel.
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