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I found somehow interesting command do specify disk usage which I am using without actually knowing what does the exclude pattern do. Instead excluding some locations or file names or just globs, the exclude pattern consists of the regular expression '*[0-9]G*'

Complete command is du --exclude='*[0-9]G*' -hax / | grep '[0-9]G\>' but the first exclude parameter and the last grep parameter are a little bit confusing me as I thought on the first that I am excluding the exactly same parameter whih I am grepping later. Any help with these arguments would be appreciated.

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'*[0-9]G*' is in fact a glob expression - not a regular expression.

The command excludes input filenames matching '*[0-9]G*', and then greps for du output lines matching '[0-9]G\>' such as would be produced due to the -h (--human-readable) du option - for example

3.3G  /usr/lib
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  • Basically, the exclude glob expression will exclude the filenames with the numerical characters in file name and the 'G' acts as a switch for the global search? And the grep will filter just results with the file size larger than 1GB also? I know that the [0-9] is range, but what 'G\>' stands for? – Alan Kis Jun 10 '17 at 20:46
  • Almost - the G is literal in both the du glob expression and the grep regex. The \> in the grep regex is a GNU-specific word boundary – steeldriver Jun 10 '17 at 20:48

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