I am new to UNIX and I am trying to write a shell script. I want to be able to list all files that were created with yesterdays dates (APR 29 as an example) that are not 0 file size.Then in those files I want to look for the string 'Process Complete' and list all files that DONT have that string.... (8 Replies)
Hi Guys.
I am very new to UNIX.
I need to get yesterdays and tommorows date given todays date.
Which command and syntax do i use in basic UNIX shell.
Thanks. (2 Replies)
i tried to use "find" to get all of yesterdays files but missed something in the 24 hours logic.
can anybody help me with this one?
i thought that -daystart -atime 1 was enough but i got more files (2 Replies)
I need to get yesterdays date in the format yyyymmdd
I can get today's date simply enough - 20031112
Is there any way to substract 1 from this easily enough in korn shell script?
It has to be korn shell and not perl (20 Replies)
Hi,
Was using date +%Y%j to get current julian date. Can anyone let me know how can I get y'day's julin date. Thx
Did check FAQ but couldn't find anything.
Thanks. (3 Replies)
hi All,
I have this sample text file - access.log:
Jan 18 21:34:29 root 209.151.232.70
Jan 18 21:34:40 root 209.151.232.70
Jan 18 21:34:43 root 209.151.232.70
Jan 18 21:34:56 root 209.151.232.70
Jan 18 21:35:10 root 209.151.232.70
Jan 18 21:35:23 root 209.151.232.70
Jan 18 21:36:04 root... (2 Replies)
Hi,
I have been trying to get the yesterdays date for the Input date I pass.
I know how to do for the current timestamp but how to do for the input date.
Is there any way I can convert to epoch time and do manipulations and back to human readable date?
Please help
Thanks
... (1 Reply)
Using the find command to find files in a directory and automatically delete files older than 24 hours find . -mtime +0 | grep file | xargs rm. Using the find man page but I can't seem to make it work for files that have the previous day's time stamp but are not 24 hours old. Is there a way for... (4 Replies)
Discussion started by: jimmyf
4 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)