I have a directory that contains a number of history files for a process. Every file starts with the string "EVACK". FOr example
EVACK0101.000001
EVACK0102.095940
EVACKmmdd.hhmiss
I want to erase in the specific directory ONLY(no sub-directories) all EVACK files older then 90 days. I... (2 Replies)
Hi,
I have a file that has rows that start with # and ends with #. For example..
# hi text
JK NM
JK NM
JK K
JK NM
# no
# yes
So I want to remove the #'s and put them into another file. so the output will be two files..
File 1:
JK NM
JK NM
JK K
JK NM (3 Replies)
Fruit : Price : Quantity
apple : 20 : 40
chiku : 40 :30
Hey guys, i have written a code using sed to delete a specific char which is being typed in. But the problem i am having is , how can i expand my coding to actually allow it do delete the whole row. For example,... (21 Replies)
Hi,
I want to delete rows whenever column one has the letters 'rpa'. The file is tab seperated.
e.g.
years 1
bears 1
cats 2
rpat 3
rpa99 4
rpa011 5
then removing 'rpa' containing rows based on the first column
years 1
bears 1
cats 2
thanks (7 Replies)
I have done a couple of searches on this and have found many threads but I don't think I've found one that is useful to me - probably because I have very basic comprehension of perl and beginners shell so trying to manipulate a script already posted maybe beyond my capabilities....
Anyway - I... (26 Replies)
I know this is a complicated question but I will try to illustrate it with some data. I have a data file that looks like the following:
1341 NA06985 0 0 2 46.6432798439
1341 NA06991 NA06993 NA06985 2 48.8478948517
1341 NA06993 0 0 1 45.8022601455
1340 NA06994 0 0 1 48.780669145
1340... (1 Reply)
there are 20 variables and I would like to delete the rows if 13th-20th columns are all NA.
Thank you!
FID IID aspirpre statihos fibrahos ocholhos arbhos betabhos alphbhos cacbhos diurehos numbcig.x toast1 toast2 toast3 toast4 ischoth1 ischoth2 ischoth3 ischoth4
101 101 1 1 1 1 1 2 1 2... (2 Replies)
Hi,
I have a tab delimited text file where I want to delete all rows that have the same string for column 1. How do I go about doing that? Thanks!
Example Input:
aa 1
aa 2
aa 3
bb 4
bc 5
bb 6
cd 8
Output:
bc 5
cd 8 (4 Replies)
I have a series of csv files in the following format
eg file1
Experiment Name,XYZ_07/28/15,
Specimen Name,Specimen_001,
Tube Name, Control,
Record Date,7/28/2015 14:50,
$OP,XYZYZ,
GUID,abc,
Population,#Events,%Parent
All Events,10500,
P1,10071,95.9
Early Apoptosis,1113,11.1
Late... (6 Replies)
Discussion started by: pawannoel
6 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)