Hi folks,
I'm using bash and would like to do the following. I would like to read some values from the file and store it in the variable and use it.
My file is 1.txt and its contents are
VERSION=5.6
UPDATE=4
I would like to read "5.6" and "4" and store it in a variable in shell... (6 Replies)
My file is in this format :
username : student information : default shell : student ID
Eg :
joeb:Joe Bennett:/bin/csh:1234
jerryd:Jerry Daniels:/bin/csh:2345
deaverm: Deaver Michelle:/bin/bash:4356
joseyg:Josey Guerra:/bin/bash:8767
michaelh:Michael Hall:/bin/ksh:1547
I have to... (1 Reply)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I have to read the contents of each field of a file creating user accounts.
The file will be of format :
... (6 Replies)
i want to store the output of 'tail -5000 file' to a variable.
If i want to access the contents of that variable, it becomes kinda difficult because when the data is stored in the variable, everything is mushed together. you dont know where a line begins or ends.
so my question is, how can i... (3 Replies)
Hi all, im having snags creating a variable which uses commands like cut and grep. In the instance below im simply trying to take a value from another file and assign it to a variable. When i do this it only prints the $a rather than the actual value. I know its simple but does anyone have any... (1 Reply)
Hi one of the output of the command is as below
# sed -n "/CCM-ResourceHealthCheck:/,/---------/{/CCM-ResourceHealthCheck:/d;/---------/d;p;}" Automation.OutputZ$zoneCounter | sed 's/$/<br>/'
Resource List : <br>
*************************** 1. row ***************************<br>
... (2 Replies)
I am working on a script for Mac OS X that, among many other things, gets a list of all the installed Applications. I am pulling the list from the system_profiler command and formatting it using grep and awk. The problem is that I want to be able to use each result individually later in the script.... (3 Replies)
I have a below syntax its working fine...
var12=$(ps -ef | grep apache | awk '{print $2,$4}')
Im getting expected output as below:
printf "%b\n" "${VAR12}"
dell 123
dell 456
dell 457
Now I wrote a while loop.. the output of VAR12 should be passed as input parameters to while loop and results... (5 Replies)
Hi All,
I was trying a shell script. I was unable to store file contents to a variable in the script. I have tried the below but unable to do it.
Input = `cat /path/op.diary`
Input = $(<op.diary)
I am using ksh shell. I want to store the 'op.diary' file contents to the variable 'Input'... (12 Replies)
In the below bash I am trying to read each file from a specific directory into a variable REF or VAL. Then use those variables in an awk to compare each matching file from REF and VAL. The filenames in the REF are different then in the VAL, but have a common id up until the _ I know the awk portion... (15 Replies)
Discussion started by: cmccabe
15 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)