如何在ncdu中排除指定目录？man手册未找到相关说明

Hey there, let's work through your ncdu problems. It's easy to overlook the exclude flags in the man page—those options can be tucked away in the details, so no worries about missing them initially!

Excluding Specific Directories in ncdu #

ncdu actually has built-in options to skip directories, you just need to use the right flags:

• Single directory exclusion: Use the --exclude flag directly in the command line. To skip /home/tmp while scanning the root filesystem, run:

  ncdu --exclude /home/tmp /
  

• Multiple directories: Chain multiple --exclude flags if you need to skip several paths:

  ncdu --exclude /home/tmp --exclude /var/large-log-files /
  

• Exclude via a file: If you have a long list of paths to skip, create a text file (e.g., ~/.ncdu-excludes) with one path/pattern per line, then use the -X flag to reference it:

  ncdu -X ~/.ncdu-excludes /
  

  Example content for ~/.ncdu-excludes:

  /home/tmp
  /var/cache
  /tmp
  

Fixing the Slow /home/tmp Scan #

Your ncdu -x / command was slow because -x only restricts scanning to the current filesystem—it doesn't skip directories within that filesystem. Since /home/tmp is on the same root filesystem, ncdu still scans every file inside it.

Beyond excluding it, here are a couple extra tips:

• If /home/tmp is full of disposable temporary files, consider cleaning it first with rm -rf /home/tmp/* (double-check you're deleting the right files before running this!)
• If /home/tmp is mounted as a tmpfs (in-memory filesystem), scanning it usually doesn't give useful disk usage data—excluding it permanently via the exclude file is a smart move.
• Use the --exclude-caches flag if /home/tmp is marked as a cache directory (it looks for a CACHEDIR.TAG file inside), which will auto-skip it without needing to specify the path.

Just a quick note: Don't mix up -x (filesystem restriction) and -X (exclude file)—that's an easy mix-up that might have thrown you off when checking the man page!

内容的提问来源于stack exchange，提问作者Drunken M