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Gm to all, I need to find the sum of the total files of a certain type (for example pdf) in my entire linux machine (total file size, not the total occupied size). For example i want to know the total size of all my pdf files or my jpg files starting from the root. Of course, i need to use bash. Any suggestion? (the only thing that i've learnt is that i should use -b option if using du).

Many thanks!

  • You might want to take a look at the find command: you can pass it a call to du with its -exec arg – joH1 Jan 16 '18 at 14:17
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With GNU find:

(echo 0; find / -name '*.pdf' -printf '%s+\n'; echo p) | dc

That gives a sum of the file size (not disk usage) of all the regular (excluding symlinks, directories, fifos...) pdf files.

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find / -name '*.pdf' -print0 | xargs -0 du -skc
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    That only works if the list of file is small enough that only one du invocation is needed. – Stéphane Chazelas Jan 16 '18 at 14:13
  • For pdf files of type directory, that would count the disk usage of the file itself and also all the files under it. – Stéphane Chazelas Jan 16 '18 at 14:14
  • Note that du reports disk usage, not file size. GNU du has a --apparent-size for file size. – Stéphane Chazelas Jan 16 '18 at 14:15
  • Note that for files that have several links, that counts only one of them. With GNU du, you can disable that with -l – Stéphane Chazelas Jan 16 '18 at 14:15
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    Note that if there's no pdf file, that will give you the disk usage of the current directory (GNU xargs has a -r option to avoid that, or you can use the standard -exec du... {} + instead of the -print0/xargs -0 GNU extension) – Stéphane Chazelas Jan 16 '18 at 14:17

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