I've not come across this before, so on a scrap server, I ran it from the command line. I just got the following output:-
Your VAR='.... command will simply assign the literal text as shown to the variable VAR
Can you give us a bit more context as to where it was seen. If there is a small and complete bit of code that does something, could you share it? That would give us more to work on.
I'm trying to write a simple script that takes all the .tar.gz files in a directory and verifies them by using the gzip -tv command:
for zip in *.tar.gz
do
gzip -tv $zip
if ; then #Check return code from tar
echo "File ${zip} verified OK."
exit... (4 Replies)
I have a script that's meant to check the disk usage on a particular volume and delete the oldest logfile if it's over a certain percentage. It runs fine on a Linux machine, but on a Solaris one, I get this error:
diskspace_check.sh: syntax error at line 3: `diskspace=$' unexpected
I assume... (2 Replies)
Hello.
In the following :
RESTORE_FF contain a file name : a_file.tar.gz
I am testing in a directory if "a_file.tar.gz" exists and or if any file like "a_file.tar.gz" exists.
So "a_file.tar.gz" will give me file exists
So "a_file.tar.gz." will give me file exists
So... (5 Replies)
ec2addtag --region us-west-1 vol1234 --tag Name=$nameinst;
It should execute
ec2addtag --region us-west-1 vol1234 --tag Name=webserver;
Instead it thinks that Name is equal to that variable. Please help. Thanks!
Please use code tags! (0 Replies)
The below bash function uses multiple variables CODING, SAMPLE, SURVEY, andvariant
in it. The user selects the cap function and details are displayed on the screen using the $SURVEY variable, the directory is changed to $SAMPLE and the samples.txt is opened so the user can select the sample to... (6 Replies)
In the bash function below if the user selets "y" then the menu function is called and if they select "n" the move function is called. That all seems to work, my question is after the files are moved an echo,
line in bold is displayed and another function called backup is called. I am getting a... (1 Reply)
Hello! i try to understand the art of bash scripting but unfortunately, more i try and less i understand it.
Can someone tell me how i can learn its logic? i will give you an example why its making me crazy. Look at this basic script:
my for loops are working like this, but it took me more than... (10 Replies)
I am sharing a code snippet.
for (( i=0; i<=$(( $count -1 )); i++ ))
do
first=${barr2}
search=${barr1}
echo $first
echo "loop begins"
for (( j=0; j<=5000; j++ ))
do
if } == $search ]]; then
echo $j
break;
fi
done
second=${harr2}
echo $second (2 Replies)
Discussion started by: ngabrani
2 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)