Another newbie to Unix scripting Q..
How do you assign a value resulting from a command, such as awk, to a variable.
I am currently trying:-
$awk '{print $1}' file1 > variable1
with no change to $variable1.
The line:
$awk '{print $1}' file1
does print the first line of the... (3 Replies)
Date of Request: 20080514 10:37 Submitted By: JPCHIANG
i want to get the value "JPCHIANG" only in read a file, however, when i do this:
name=`"$line"|cut -d " " -f8`
it display all the line and append 'not found' at the end of the statement
the $line is actually a variable in a... (2 Replies)
hi all,
in ksh, how do i assign the output of a find command to a variable, e.g
am trying something like this :
totalNoFiles=$(print find ./ -name "SystemOut*.log");
but when i echo $totalNoFiles it displays
find ./ -name "SystemOut*.log"
instead of the total number of... (2 Replies)
Hi All,
I am getting the output for the following command when i run it on the unix console.
---------------------------
grep `whoami` /etc/passwd | awk '{print ($1);}' | cut -d ":" -f3
----------------------------
But i made it into a script and tried to print the variable, its... (5 Replies)
can we make a global variable and store character values and add other values to that variable ?? for example
a="hello, John"
and can we add value ". How are you? so
a can have
"hello, John. How are you?"
can someone help me?? (2 Replies)
Hi folks.
I have this variable called FirstIN that contains something like this: 001,002,003,004...
I am trying to assign the content of this variable into ModifiedIN but with the following format : 001 002 003 004...(changing the commas for spaces)
I thought about using sed but i am not... (17 Replies)
Hi All,
I have a fixed-width datafile from which i need to extract value/string starting from some position to the specified length in each of the lines.
awk '{print substr($0,x,y)}' datafile --- is working fine
but
awk 'BEGIN{a=0}{a=substr($0,x,y);print $a}' datafile ---is giving... (3 Replies)
suppose in my script i have written
a1=2
a2=4
read option
# I directly want to see the value of a1 or a2 (i:e; 1 or2 )depending upon i/p given like a1 or a2 to option var.so what should i give .Suppose if I give a1 to option then how can I see the value.
echo $$option --- doesn't work
pls... (3 Replies)
Hi,
I'm using the bourn shell on a Sun Solaris Unix system. I am relatively new to UNIX scripting so please bear with me...
I'm having a couple issues:
1) I need to have a variable $FSIZE set with the output of a command each time the script runs. (the command looks for a file and... (8 Replies)
Discussion started by: dqrgk0
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)