I need help to strip out the first two characters of the variable $FileName. Please help.
FileName=`find . -mtime +0 -name '*'`
Contents of variable $FileName:
./SRIZVI4.MCR_IDEAS_REPORT.LAST.052705.075405.csv
I want to strip out "./" and place the contents in another variable. How do I... (3 Replies)
Can someone please help me figure out what the command syntax I need to use is?
Here is what I am wanting to do.
I have hundreds of thousands of files I need to look for a specific search string in.
These files are spread across multiple subdirectories from one main directory.
I would like... (4 Replies)
Hello everyone,
I'm writing a script to add a string to an XML file, right after a specified string that only occurs once in the file. For testing purposes I created a file 'testfile' that looks like this:
1
2
3
4
5
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9
And this is the script as far as I've managed:
... (2 Replies)
This is a pretty straight-forward question. Within a program of mine, I have a string that's going to be used as a filename, but it might have some invalid characters in it that wouldn't be valid in a filename. If there are any invalid characters, I want to get rid of them and essentially squeeze... (4 Replies)
Hi Everyone,
I have a.txt
12341" <sip:191@vo.my>;asdf=q"
116aaaa<sip:00091@vo.my>;penguin
would like to get the output
191
00091
Please advice.
Thanks (4 Replies)
Hi all,
I like to know how to get the count of each character in a given word. Using the commands i can easily get the output. How do it without using the commands ( in shell programming or any programming)
if you give outline of the program ( pseudo code )
i used the following commands
... (3 Replies)
Hello. How can i put all of the special characters on my keyboard into a string in c++ ?
I tried this but it doesn't work.
string characters("~`!@#$%^&*()_-+=|\}]{
How can i accomplish this?
Thanks in advance. (1 Reply)
Hello Folks..
I need your help ..
here the example of my problem..i know its easy..i don't all the commands in unix to do this especiallly sed...here my string..
dwc2_dfg_ajja_dfhhj_vw_dec2_dfgh_dwq
desired output is..
dwc2_dfg_ajja_dfhhj
it's a simple task with tail... (5 Replies)
Hi All,
I am trying to extract only characters from a string value eg: abcdedg1234.cnf
How can I extract only characters abcdedg and assign to a variable.
Please help.
Thanks (2 Replies)
I have this fastq file:
@M04961:22:000000000-B5VGJ:1:1101:9280:7106 1:N:0:86
GGGGGGGGGGGGCATGAAAACATACAAACCGTCTTTCCAGAAATTGTTCCAAGTATCGGCAACAGCTTTATCAATACCATGAAAAATATCAACCACACCA
+test-1
GGGGGGGGGGGGGGGGGCCGGGGGFF,EDFFGEDFG,@DGGCGGEGGG7DCGGGF68CGFFFGGGG@CGDGFFDFEFEFF:30CGAFFDFEFF8CAF;;8... (10 Replies)
Discussion started by: Xterra
10 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)