Hi there,
I need help on setting the path variable. How can I set the path variable with Bourne Shell. My scripts goes like this, but did not work.
#!/bin/sh
PATH=/usr/bin:/usr/ucb:/etc:/export/home/zchen/home
export PATH
Thanks,
Z (4 Replies)
Hi all,
I have a java command in a shell script.
When i m executing the command from the prompt its working fine. But when i paste the same command in a shell script and execute the shell script it says path not found. Please help. (5 Replies)
Hi,
I am new to shell scripting.I tried adding an entry to the path variable like below
export PATH=$PATH:/opt/xxx/bin
But am getting an error invalid identifier /opt/xxx/bin
Can someone tell me the error above and correct me .
Thanks and Regards,
Padmini (2 Replies)
Hi,
Could anyone help me in writing a single line code by either using (sed, awk, perl or whatever) to extract a specific path from the PATH environment variable?
for eg: suppose the PATH is being set as follows
PATH=/usr/bin/:/usr/local/bin:/bin:/usr/sbin:/usr/bin/java:/usr/bin/perl3.4
... (2 Replies)
Hi,
I have a large flat file from host without delimiter. I'm transforming this file to a csv file using statements like
# Row 03: Customer / field position 3059 +20
WOFABNAM=substr( $0, 3059, 20 );
and deleting the trailing whitespaces before and after with that
sub( /^ +/, "",... (4 Replies)
I do know how we set the PATH variable-
export PATH=$JAVA_HOME/bin:$PATH
I'm trying to understand why we have written :$PATH in the end above statement. What is it's meaning? (2 Replies)
I have a script like this running under OS X 10.8. The problem arises when the find command encounters a space in the path name. I need the "dir" variable as I'll be extending the script to more general use.
#!/bin/bash
CFS=$IFS
IFS=$(echo)
set dir = "/Users/apta/Library/Mail\... (3 Replies)
Hi All,
I did a review of some threads to see if someone had come across this problem.
My system is an oracle virtual box solaris 10 installed on a windows 10 system.
Right now I am learning scripting and am just playing with the env variables.
I am trying to update the PATH to... (9 Replies)
Hello all,
I am EXTREMELY new to using bash and I have a bit of a problem: I'm trying to set up a shell script that can
1.) take one of several giant files off of an external hard drive
2.) use it as input for scripts on my laptop's hard drive
... (3 Replies)
Discussion started by: machine_spirit
3 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)