Hi,
I have files that are named front1.txt to front999.txt. They are all in the same directory. To change "front" to "back", I am doing something like this.
for file in *.txt; do
new=`echo $file | sed 's/^**/back/g'`
mv $file $new
done
My problem is what if files are named... (6 Replies)
I'm executing "wc -lc" command in a c shell script to get record count and byte counts and writing them to a file. I get the result with the full pathname of the file. But I do not want the path name to be printed in the output file. I heard that using Awk we can get this but I don't have any... (4 Replies)
Hi,
One of the scripts creates logs in the format:
progname_file1.log.20100312020657
where after file the number could be from 1 to 28 and after log. the date is attached in the format YYYYMMDDHHMISS
progname_file<1-28>.log.YYYYMMDDHHMISS.
Now I want to discard the .20100312020657... (7 Replies)
Hello there,
I need some help.
I have a file containing this :
$ cat file
PARM1=(VAL11),PARM2=(VAL21,VAL22,VAL23),PARM3=(VAL31),PARM4=(VAL41,VAL42)
and I need to replace all the ',' by '|' but only those which are between brackets.
Output would be :... (10 Replies)
I am working with the ksh shell in HP UNIX and I am attempting to extract a word, beginning with a particular string and ending at the first space. for example I want to extract the word or string MS_RECENT_ACTIVITY from the following string
" This has been entered in MS_RECENT_ACTIVITY the... (2 Replies)
I have a file with 100s of lines of text. I want to perform an extraction of this line:
Info bpzs(pid=2652) using 1000 bits
I have not been able to extract it. Should I try expr match or is there another method? This line has data both in front of and in back of it. I do not have grep -o... (5 Replies)
I have to extract number part (Date and timestamp part ) from the following 3 strings
AB_XYZA_20130930183017.log
AB_DY_XYZA_20130930183017.log
AB_GZU_20130930183017.log
Output should be
20130930183017
Please help me to get the string like above
Thanks (2 Replies)
Hi,
I have a string with name as 20140412-s1-Potopolive_promos_20140412. So I want to extract only Potopolive string. Could you please help me the command.
O/p : Potopolive
Thx in advance (5 Replies)
Hi All,
Let us say we have 5 log files, extract the data from all log files and save the output in a file.
home/log/first.log
home/log/second.log
home/log/third.log
home/log/four.log
home/log/five.log
I want to extract the following text from the log files and save the output in a file.... (7 Replies)
Discussion started by: ROCK_PLSQL
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)