You could also try:
Note that I used printf instead of echo because the output you get from echo might not be what you want if a line in the expansion of $COUNTPRO2 starts with a hyphen or contains any backslash characters. And, using a here-document instead of an array makes it portable to many more shells.
Forking and execing an external utility is a VERY slow operation when compared to the actions required to perform a case statement pattern match.
Although the above was written and tested using a Korn shell, this should work with any shell that is based on Bourne shell syntax (including a 1970's vintage pure Bourne shell).
These 2 Users Gave Thanks to Don Cragun For This Post:
Hi,
I've searched this site and not found this already, so if I missed on my search, sorry.
I need to pass in a variable to a script, where the first three characters of that variable represent a calendar quarter, and the last 2 characters are the year. I.E. Q0105 for Q1, Q0205 for Q2, and... (3 Replies)
i need to use a case statement to do something when the user enters nothing at the prompt.
i know about the if statement and that isnt' what i'm interested in using for this. i want to use case.
heres the scenerio. a program asks a user for an input. i want to use a case statement to... (1 Reply)
Please bare with me as task is very detailed and I'm extremely new to Awk/sed. Keep in mind I'm running windows so I'm using a dos prompt
The attachment is a server report that I'm trying to manipulate with little success. For each server, I need to take the most recent information about them... (2 Replies)
Hi there,
Im having some problems with this function, I pass two arguments to the function $1 $2 (Arguments are month and date inputted by the user)
for some reason the case always fails... however in the cases defined below where it shouldnt fail the result is:
if it fails with input... (6 Replies)
Hi, I have a variable $Ctrcd which contains country names in upper case and i want to convert them into lower case. I have tried so many solutions from already existing threads but couldn't get the correct one.
Can anybody help me with this.....
Thanks a lot.. (2 Replies)
Hi, I need to change military time to regular time. I know to use case to indicate whether a.m. or p.m. as follows:
case "$hour"
in
0? | 1 ) echo a.m.;;
1 ) echo p.m.;;
* ) echo p.m.;;
esac
My question is how do I add the hour and minute... (2 Replies)
Hi all,
I wrote the following simple shell script to perform addition, subtraction, multiplication and division. In the below program, i am not able to exit from the script
Shell Script
-----------
#!/bin/sh
bgcal() {
cal=""
echo "Enter the Option Number: \c"
read cal
if
then... (3 Replies)
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:
The assignment is posted below:
Maintain automobile records in a database
Write a shell script to create,... (1 Reply)
Hi ,
I have the file where i have to search for the pattern. The pattern may be lower case or upper case or camel case. Basically I want to ignore while searching the pattern in awk.
awk '/error|warning/exception/' filename
Please help me (3 Replies)
Hello, I wrote the case on code but it mistakes. I am not sure.
If/elif code:
#!/bin/ksh
you=$LOGNAME
hour=`date | awk '{print substr($4, 1, 2)}'`
print "The time is: $(date)"
if (( hour > 0 && $hour < 12 ))
then
print "Good morning, $you!"
elif (( hour == 12 ))
then (7 Replies)
Discussion started by: Masterpoker
7 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)