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wilburpan
l33t
Joined: 21 Jan 2003
Posts: 977
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 Posted: Mon Jul 06, 2009 9:37 pm Post subject: Need help with a script to set permissions |
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I have a directory that holds a lot of document/media files, called FileCabinet. There are a lot of subdirectories and they are nested pretty deeply.
Here's my issue: I'd like to make sure that all of these files have 0644 permissions. No problem, right? I entered this command:
| Code: | | chmod 0644 -R FileCabinet |
Which should convert everything in this folder to 0644, permission-wise.
Problem is, that command also converted the folder permissions to 644, which played havoc with the subdirectories. I would get this issue:
| Code: | ls -l FileCabinet
ls: cannot access FileCabinet/Pictures: Permission denied
ls: cannot access FileCabinet/Movies: Permission denied
ls: cannot access FileCabinet/Documents: Permission denied
total 0
?????????? ? ? ? ? ? Documents
?????????? ? ? ? ? ? Movies
?????????? ? ? ? ? ? Pictures |
Obviously, what happened is that with the last command, I changed the directories to 0644 as well, which my system doesn't like. This is fixable -- I just change everything to 0755.
But is there a way to write a script that traverses the directory and changes everything to 0644 except for the directories themselves?
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Nerevar
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Joined: 31 May 2008
Posts: 720
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| Posted: Mon Jul 06, 2009 9:56 pm Post subject: |
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| Code: | | find . -type d -print0 | xargs -0 chmod 0755 && find . -type f -print0 | xargs -0 chmod 0644 |
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wilburpan
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Joined: 21 Jan 2003
Posts: 977
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| Posted: Tue Jul 07, 2009 2:16 pm Post subject: |
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Thanks -- that did the trick!
I need to spend more time with the 'find' and 'xargs' commands.
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alex.blackbit
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Joined: 26 Jul 2005
Posts: 2397
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| Posted: Tue Jul 07, 2009 2:29 pm Post subject: |
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| Nerevar wrote: | | Code: | | find . -type d -print0 | xargs -0 chmod 0755 && find . -type f -print0 | xargs -0 chmod 0644 |
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| Code: | | $ find <path> -type d -exec chmod 0755 {} \; && find <path> -type f -exec chmod 0644 {} \; |
is possible too, IMHO a little bit more elegant. |
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Nerevar
l33t
Joined: 31 May 2008
Posts: 720
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| Posted: Tue Jul 07, 2009 3:33 pm Post subject: |
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| alex.blackbit wrote: | | Nerevar wrote: | | Code: | | find . -type d -print0 | xargs -0 chmod 0755 && find . -type f -print0 | xargs -0 chmod 0644 |
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| Code: | | $ find <path> -type d -exec chmod 0755 {} \; && find <path> -type f -exec chmod 0644 {} \; |
is possible too, IMHO a little bit more elegant. |
I don't like the exec switch, but if you insist on using it you should look at the "-exec command {} +" variant in the manpage. It will speed up the operation on directories with many files. |
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timeBandit
Bodhisattva
Joined: 31 Dec 2004
Posts: 2719
Location: here, there or in transit
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| Posted: Tue Jul 07, 2009 3:36 pm Post subject: |
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| alex.blackbit wrote: | | Code: | | $ find <path> -type d -exec chmod 0755 {} \; && find <path> -type f -exec chmod 0644 {} \; |
is possible too, IMHO a little bit more elegant. |
In addition, use + instead of \; to get behavior more like an xargs pipeline (fewer spawned processes).
Edit: Bah. Too slow. What he (Nerevar) said. 
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alex.blackbit
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Joined: 26 Jul 2005
Posts: 2397
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| Posted: Tue Jul 07, 2009 6:51 pm Post subject: |
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| k, thx. |
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