10-19-2011
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
In perl I want to do remove the top line of my input file then process the next line. I want to do something like
head -1 inputfile > temp
grep -v temp inputfile > newinputfile
cp newinputfile inputfle
is this possible in perl? (3 Replies)
Discussion started by: reggiej
3 Replies
2. Shell Programming and Scripting
I have a matrix , how do I compare all the elements of a column , lets say I want to check if the columns contain the alphabets "S","H","A","R","A","T".
and not "X"s.
Lets say matrix looks something like this ..
SSSXSH
HHXXHA
AAXXAT
RRRXRS
AAXTAR
TTTTTA
I can hard code it where... (4 Replies)
Discussion started by: sharatz83
4 Replies
3. UNIX for Dummies Questions & Answers
Hello,
I have a file that lists a few hundred values.
Example:
abca
abcb
abcc
abcd
I have a 2nd file with a few thousand lines. I need to remove every line from the 2nd file that contains any of the values listed in first file.
Example of strings to delete:
line1 *abca* end of... (1 Reply)
Discussion started by: upstate_boy
1 Replies
4. Shell Programming and Scripting
Hi Folks,
The subject is my question:
Can we pass an array of strings from a Perl Program to a Shell Script?
Please provide some sample code.
Thanks
---------- Post updated at 11:52 PM ---------- Previous update was at 11:43 PM ----------
I got it.
Its here:... (0 Replies)
Discussion started by: som.nitk
0 Replies
5. Shell Programming and Scripting
Dear all,
I have a variable called $abc, which the value is something like below,
*** *********** : *****
where * can be anything. I need to remove all but the final characters until last whitespace.
example
grd groupstudy : tutor6/7
becomes tutor6/7
something like
if... (2 Replies)
Discussion started by: tententen
2 Replies
6. Shell Programming and Scripting
HI all,
These are examples of the original value from a variable
$abc can be
FastEthernet1/0
GigabitEthernet3/1
Serial1/0
If $abc is FastEthernet*/* (where * can be any number), replace $abc value to fa*/* (same number as the original value). GigabitEthernet becomes ga*/* and Serial... (2 Replies)
Discussion started by: tententen
2 Replies
7. Shell Programming and Scripting
Hello,
I have a huge file of over 2,00,00,00 strings in UTF8 format. I have managed to write a script in Perl which sorts them neatly as per their Unicode ranges.
However I am now stuck with a script which will pipe out all strings between 3 and 20 letters/characters. I am not very good at... (2 Replies)
Discussion started by: gimley
2 Replies
8. Shell Programming and Scripting
Hi folks,
I have a log file in the below format and trying to get the output of the unique ones based on mnemonic IN PERL.
Could any one please let me know with the code and the logic ?
Severity Mnemonic Log Message
7 CLI_SCHEDULER Logfile for scheduled CLI... (3 Replies)
Discussion started by: scriptscript
3 Replies
9. Programming
Perl script to merge cells
---------- Post updated at 12:59 AM ---------- Previous update was at 12:54 AM ----------
I am using below code to read files from a dir and print to excel.
open(my $in, '<', $file) or die "Could not open file: $!";
my $rowCount = 0;
my $colCount = 0;... (11 Replies)
Discussion started by: Jack_Bruce
11 Replies
10. Shell Programming and Scripting
Hi team,
I'm a newbie of Perl Script and looking to create a simple perl script that will run in the Linux system:
1) to find process, such as ps -ef | grep process name
2) to exclude strings from the output if it found, for instance if i see abc from usr process, then will exclude it from... (1 Reply)
Discussion started by: hoffman2503
1 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)