Hello
I have this script:
#!/bin/ksh
INPUTFILE=$1
TEMPFILE=$INPUTFILE.$$
OUTPUTFILE=$INPUTFILE.new
# nr of arguments has to be 1
if
then
echo "\nUsage: $0 inputfile\n"
return 1
fi
# inputfile must exist and be readable
if
then (13 Replies)
Hi,
I need to find a file with name xyz.mno.1234235.msg
Here the numbers can be anything and is not fixed. But the first 6 characters are fixed ie, xyz and mno are fixed and wont change. Actually this file comes to this directory every week with only the number part changing.
How is it... (7 Replies)
Good evening All,
I have a perl script to pull out all occurrences of a files beginning with xx and ending in .p. I will then loop through all 1K files in a directory. I can grep for xx*.p files but it gives me the entire line. I wish to output to a single colum with only the hits found. ... (3 Replies)
Im going insane trying to figure out what i consider a basic command on an SFTP server...
Im trying to download all files from a directory *done*
then remove all the files (and sometimes folders that contain files) i have downloaded on the remote directory...
the command i would normally... (2 Replies)
I am using the following command to check for files on a Unix (Solaris 9) and on Linux:
if (-r *.) then
echo " las file found"
else
echo " no las file found"
endif
If no las file is present, the "no las file found" message is displayed. If a las file is present, however, I get... (9 Replies)
All,
I am trying to figure out a script to run in windows that will allow me to match on First column in file1 to 8th Column in File2 then
Insert file1 column2 to file2 column4 then create a new file.
File1:
12345 Sam
12346 Bob
12347 Bill
File2:... (1 Reply)
Hi All,
I am hoping someone can help me with some scripting I need to complete using AWK.
I'm trying to process multiple fixed files to generate one concatenated fixed file in a standard format.
The Input file is:-
aaaa bbbbb ccccc 1 xxxx aaa bbb
aaaa bbbbb ccccc 2 abcd aaa CCC... (9 Replies)
Does anyone know how I would go about inserting text at the beginning of a file with the file name containing a daily time stamp? Essentially I need to find the file name using a wild card, and then insert 3 lines of text - one of which is the processing date. Help please!? (1 Reply)
Hello,
I'm trying to figure out how best to approach this script, and I have very little experience, so I could use all the help I can get. :wall:
I regularly need to delete files from many directories.
A file with the same name may exist any number of times in different subdirectories.... (3 Replies)
Discussion started by: *ShadowCat*
3 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)