Beefy Boxes and Bandwidth Generously Provided by pair Networks Cowboy Neal with Hat
Think about Loose Coupling
 
PerlMonks  

How do I modify a file and preserve the ownership and permissons?

( #62375=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Mar 06, 2001 at 03:20 UTC
Q&A  > files


Description:

I hava a script I wrote that recursivly does a search and replace on strings in text files. Once I have the desired text how do I write it back without changing the ownership and mode of the file? If i do: "open(SESAME, ">temp");" then the ownership is changed to me and mode is set to the default.

Answer: How do I modify a file and preserve the ownership and permissons?
contributed by Masem

When you open the file for writing there is no way of getting around the file system changing the permissions and the like on you. So the only way to deal with this is to capture these settings through the stat() function, and then to reapply the mode, uid and gid via chmod and chown. For example:

my $filename = "some.txt"; my @stats = stat( $filename ); open( FILE, ">$filename" ) or die $!; # do your magic to the file.... close( FILE ); chmod $stats[2], $filename oe die $!; # mode is stored in stat field + 2 chown $stats[4], $stats[5], $filename or die $!; # uid in 4, gid i +n 5

edit: chipmunk on 2001-03-05

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (13)
    As of 2014-04-17 04:27 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (439 votes), past polls