one of my colleagues has this question.
he has a command, C_CMD which accepts 4 variables, $1 $2 $3 $4
he wants to load up a file with multiple rows, one row per set of variables and then iteratively execute the command based on the content of the file.
example:
at the command line you'd... (5 Replies)
Hi,
In normal shell scripting, how do you pass the output of a command to a variable, instead of a file and be able to use it later?
The code is:
#!/bin/bash
who | cut -d" " -f1 > onlineusers
Instead of passing the output of the above command to the file called 'onlineusers'... (1 Reply)
Hi There!
I'm writing this LSF script to make it easier to send jobs to a cluster when varying certain parameters. At one point I'd like to do something like:
set NPROC = 10
and later on call BSUB using something like:
#BSUB -n $NPROC
unfortunately for me, this throws an error:
... (4 Replies)
Hi all,
I have a script in file1 which gets input from the user say variable "TYPE". This variable is present in the other file2. I want to replace the variable in the file2 with the value given by the user and print the file. How can I achieve this task?
file1
code
echo "Give... (3 Replies)
Hi,
How can I modify the FILETYPE command ?
I want to provide the file extension, like txt, root .?
Thanks,
#!/bin/bash
FROM=$1
TO=$2
FILETYPE=$3
... (4 Replies)
All,
I have a log file containing lots of data now i want to extract all text between block below(names) without the title or end pattern but only names,
++++START++++
SCOTT TIGER
HENRY PAUL
JARED OTIENO
OMOLLO JA NIGERIA
++++END++++
the names i want to return and store in a variable in... (1 Reply)
Hi Friend,
I have one file in which some number are mentioned and number of lines are vary every time
And i need to pass that number to my sql command from script.
Suppose i have file acc.txt
45456546456
45464564565
67854353454
67657612132
Number of records are vary every time.... (20 Replies)
cat a1
scott
robert
tom
test
script :
#!/usr/bin/ksh
for NAME in `cat a1`
do
VALUE=`sqlplus -silent "nobody/bobody01@testq" <<END
set pagesize 0 feedback off verify off heading off echo off
select username from dba_users where username=upper('$NAME');
END`
if ; then
echo... (3 Replies)
Hi all,
I have a file looks like
AAAA 111
BBBB 222
CCCC 333
need to pass variable value like var1=AAAA and var2=111
to another command for three times with next values.
stuck over here
cat file | while read line
do
export var1=`awk '{print $1}'`
echo $var1
export var2=`cat file... (3 Replies)
Below is the command
mv AP_FLEXCUBE_INTERFACE10.txt FTPYMNTE_`date "+%Y%m%d%H%M%S" | tr '' ''`.TXT
it is changing the file name to a different name according to time stamp dynamically. I want to capture that dynamic file name present in the directory to a variable .
After that i want to... (6 Replies)
Discussion started by: sujit das
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)