I'm a Linux newb, I've been running a Debian Linux server for about a year now, and I've written some simple scripts to automate various things, but I still don't know much, and I forget what I learn as fast as I figure it out... Anyway, that really isn't important, I just want you to know that... (14 Replies)
I am reading a file and copying selected lines from the file into another using echo.
For eg:
while read line
do
if ((some logic to determine whether I need to copy the current line to another file))
then
echo $line > tempfile
fi
done<srcfile
The problem I have is the data in the file... (1 Reply)
I am searching while I await a response to this so if it has been asked already I apologize.
I have a file with lines in it that look like:
bob johnson email@email.org
I need it to look like:
bob:johnson:email@email.org
I am trying to use sed like this:
sed -e 's/ /:/g' file >... (5 Replies)
Hi,
I should read one character at a fixed position from each line of the file. So how ??? should be substituted in the code below:
while read line ; do
single_char=`???`
echo "$single_char"
done < $input_file (8 Replies)
I am trying to read a txt file and trying to translate multiples spaces into single spaces so the file is more organized, but whenever I try the command:
tr ' ' ' ' w.txt
The output is:
tr: extra operand `w.txt'
Try `tr --help' for more information.
Can someone please help? :wall:
... (2 Replies)
I have a file proc.txt:
if @debug = 1 then
message 'Start Processing ', @procname, dateformat(now(*), 'hh:mm:ss'), @julian type info to client;
end if;
/*
execute immediate with quotes
'insert into sys_suppdata (property, value, key_name)
location ''' || @supp_server || '.' ||... (5 Replies)
I am new to shell scripting and wished to get few things clarified.
While calling functions within shell script, output comes out as single line irrespective of the no of echos or newlines I tried within function +
the echo -e used to invoke function ( as instructed online) :
#!/bin/sh
inc() {... (1 Reply)
Hi,
In a csv file, I want to select records where first column has zero or multiple spaces.
Eg: abc.csv
,123,a
,22,b
,11,c
a,11,d
So output should be:
,123,a
,22,b
,11,c
Please advise (5 Replies)
Hi All.
Attached are two files.
I ran a query and have the output as in the file with name "FILEWITHFOURRECORDS.txt "
I didn't want all the spaces between the columns so I squeezed the spaces with the "tr" command and also added a carriage return at the end of every line.
But in two... (3 Replies)
Hello,
This is Solaris 10 (x86)
bash-3.2# cat /etc/release
Solaris 10 5/09 s10x_u7wos_08 X86
Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 30 March... (5 Replies)
Discussion started by: solaris_1977
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)
10-21-2010
How to avoid the truncating of multiple spaces into a single space while reading a line from a file?
