Hi,
I have a crontab that runs some shell scripts at fixed intervals. Although, one condition for a script to continue is that a previous instance of the same script should have terminated. But, inspite of the fact that the old instance has finished execution, the new instance still terminates.
... (3 Replies)
Hi All
Please see the script below
for file in ${filelist
}; do
if ]; then
if ]; then
print " $(date) STEP 6 ------- Copying $file to $destpath"
fi
if ! cp $ftppath/$file $destpath 2> /dev/null; then
writeToLog "ERROR: ${0##*/} - $upartition Could not copy file $file"
if ]; then... (1 Reply)
Hi,
I wanted to compare EDI files present in Two different Directories which can be related by the file names. While comparing the EDI files i have to skip selected segments such as "ISA" "IEA" and "GS" "GE" since this may have datetime stamp and different "Sender" "Receiver" Qual.
and... (3 Replies)
I have a directory that contains some specific files. I want to find all the files and copy them to a different directory, however the files are in /dir1/dir2/dir3/filedir/archive. In ~/filedir contains about 100 directories that contains an archive directory where the files I need are. How can I... (6 Replies)
find . -type f -name "*.sql" -print|xargs perl -i -pe 's/pattern/replaced/g'
this is simple logic to find and replace in multiple files & folders
Hope this helps.
Thanks
Zaheer (0 Replies)
Hiiii Friends
I have 2 files with huge data. I want to compare this 2 files & if they hav same set of vales in specific rows & columns i need to get that value from one file & replace it in other.
For example: I have few set data of both files here:
a.dat:
PDE-W 2009 12 16 5 29 11.11 ... (10 Replies)
I have 2 files with the same header and need to append them and put the result in a 3rd file
the 2 files has the same header and while appending i want to skip the second file header and need the result to be put in a third file
Normally, this would work
Cat file1 file2 >> file3....But how... (5 Replies)
Hi,
suppose I have the following file and certain rows have missing columns,
how do i skip these rows and create an output file which has all the columns in it
E/N Ko_exp %err Ko_calc %err diff diff- diff+ 0.95
======== ======= ==== ======= ==== ===== ===== =====... (12 Replies)
How do I move all folders and its contents from a directory A to another directory B, skipping all files in Directory A ?
---------- Post updated at 12:53 PM ---------- Previous update was at 12:42 PM ----------
Ok. Got it.
mv /A/*/ /B/ (1 Reply)
Hi,
I want a simple line of code that will compress files within a directory specified (parameter) and its subdirectories and also i want to remove files which are exactly 365 days old from the sysdate after this compression.
Please help.
Thanks,
JD (8 Replies)
Discussion started by: Jesshelle David
8 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)