Try this to get the concept...
Output
It will shift the arguments from right to left
Lets say, you have 3 arguments i.e. $1=a, $2=b, $3=c
Now you "shift" and try priting $1, it will print "b" and $2 will be "c" and there will no $3
There is an error when i am trying to use the shift command in this way:
($1 = -d, $2 = 123, $3 = -c etc etc)
for $arg in $@
do
case $arg in
"-d") shift; (so that the $2 will become the $arg now)
(and while it loop the 2nd time,)
... (1 Reply)
hi all, when I press SHIFT at once it work like as
I've hold it (like CapsLock is On, but it Off) ! ... and if I press F1 (or another
function key) it put out 24z :(
it is occure on my remote sun 8 , xterm session
help me please ! (2 Replies)
Hi Folks,
In shell scripting the maximum no. of command line parameters becomes 9(Am i right). If we want to get more than 9 parameters we use the shift command.
Even here there are two possibilities.
1. Without the use of variables - The arguments are lost and the lost no. is equal to the... (6 Replies)
I am running a program where in I have this command
which is giving error the shift: number is not correct.
can you please tell me how shift actually works?
the line which is giving error is-
set $PARAM; shift; shift; shift; shift; shift; shift; shift; shift
Is it related somewhere to... (2 Replies)
Hi,
I wrote one script, in between script needs to use 10th and 11th positional parameters, that time i used "shift". Here i am facing the below find problem,
./DataCount.sh: cannot shift
I tried
1) I have read man pages for shift
2) Before but * and **
3) Simple shift with out giving... (4 Replies)
I would need the awk command or a better way to get my file that looks like
1234
5678
8912
3456
7890
to look like
1234,5678,8912,3456,7890
Thanks in advance (4 Replies)
Hi,
Firstly, I did a search for this question both on this site and on the internet and have not been able to find a suitable answer that is not general in nature.
I have always been a Windows user. I use my girl friend's mac every now and then, but I always come back to windows. For a... (1 Reply)
think using shift would help me finish my script but cant get it work without your help. would appreciate if you give me a example with shift & counter in the same script so I can later work on that to my one.
Thanks and Good Luck! (1 Reply)
Hello,
I am reading one of the AIX manuals about shell scripting and (AIX 5) and I found this example when introducing to functions:
function usage
{
prog="$1"; shift
print -u2 "$prog: usage: $prog $@"
exit 1
}
This example is meant to be easy but I don't understand what it is... (5 Replies)
#!/bin/bash
hostname=$1; shift
for hostname in $1
do
ping $hostname
done
I want to run the above script as hostname.sh yahoo.com google.com cnn.com. I want to shift each hostname to $1. How can do that with above code as currently it's not shifting. (5 Replies)
Discussion started by: scj2012
5 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)