I believe you have to use the -a parameter on the diff command to compare binaries.
It worked, but now even if archive.tar and backup.tar are the same, it says their different and it runs the first block, instead of just doing the echo which states "Files the same, exiting";
Hi,
I would like to define a script in order to update a file with the last updated records:
I wrote :
#!/bin/sh
YEAR=$(date +%Y)
MONTH=$(date +%m)
DAY=$(date +%d)
COMM=/usr/bin/comm
for file in * ;
do
if ] ; then
FILE=${DPSTY}
UNIQUE=Unique_${FILE}
... (4 Replies)
hi,
i was wondering if there is a way to find out which file is updated the most recent time in the entire file system.... most probably this would be refering to some LOG file, but i wanna find a way which file was that...
some script should work or what?
can anybody help me out on that.
for... (3 Replies)
Hi all,
my problem is teh following:
I need to move a file from a folder to another and I usually do it by the get command but in this case I have a list of file in the source folder and I have to select only the lust updated one.
Ho to do this?
All the files have the same name followed... (4 Replies)
hi all, i'm a student and managing lab at my insti. there in one application in which log file has to be maintaine the number of bytes transferred and received. but after certain entries these two attributes stop getting updated and holds same values for rest of the session. This happens one time... (4 Replies)
Hi,
I have a file, fileA, that consists of two fields. Field 1 has an old object name, and field 2 has a new object name. I would like to search and replace a master file, FileB, by substituting the old object name (field 1 in fileA) with the new object name ( field 2 in fileA).
FileA:... (16 Replies)
Hi,
I am looking for a command to search for a specific file which was recently modified in the current directory leaving some unwanted files to be listed.
For example, when I try ls - lrt
it shows the following output.
I want to ommit the files with the name 'resend' and... (3 Replies)
Input File1 constatntly running and growing in size.
My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 123 terminated
**ID PIN 12345
Comamnd Successful
Command Terminated
Command Successful
Command Terminated
**My Program Erorr ddmmyy hh:mm:ss My Program Error
**Port 345... (3 Replies)
hi can any one please help on below .im new to shell scrpting
i need to write a shell script which will check particular log file is presented or not in specific location ,if yes how long it was not modified/not rolling ?if its not modified/log is not rolling script will have to send mail (9 Replies)
Discussion started by: 4Learning
9 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)