Is there a utility that can efficiently output the differences between two large compressed files? Note: one can assume that the compressed files just differ in a few places, so that the utility MUST NOT take more than a few megabytes (whether in RAM, swap or disk).
bzdiff (from the bzip2 package) first decompresses one of the file to a temporary file, thus is not a solution (it filled up my partition!). I've also tried process substitution (with zsh, but this is also supported by bash): diff <(bunzip2 -c file1.bz2) <(bunzip2 -c file2.bz2) and diff --speed-large-files <(bunzip2 -c file1.bz2) <(bunzip2 -c file2.bz2) but in both cases, diff takes too much swap (I think the problem with process substitution is that diff cannot control how the files are decompressed, but perhaps diff doesn't cope well with this either). I've taken the example of .bz2, but I may switch to lzma. So, I'm interested in possibilities for both. -- Vincent Lefèvre <[EMAIL PROTECTED]> - Web: <http://www.vinc17.org/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/> Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
