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Full Discussion: Grabbing fields without using external commands
Top Forums Shell Programming and Scripting Grabbing fields without using external commands Post 303008142 by SkySmart on Monday 27th of November 2017 06:23:06 PM
Old 11-27-2017
Quote:
Originally Posted by Scott
If you change the read to read into an array, you can access each member of the array by index.
e.g.
Code:
unset line
while IFS=_ read -A line; do
  NF=$((${#line[@]}-1))
  echo ${line[(($NF))]} # last field
  echo ${line[(($NF-1))]} # second last field
done < file

You could combine those two echo lines inside the while-loop with:
Code:
echo ${line[((${#line[@]}-1))]} # last field
echo ${line[((${#line[@]}-2))]} # second last field

but it's a bit messier to look at.
this works for bash:
Code:
#!/bin/bash

DATA="bblah1_blah2_blah3_blah4_blah5
bblahA_blahB_blahC_blahD_blahE"

printf '%s\n' "${DATA}" | while IFS=_ read -a line; do
  NF=$((${#line[@]}-1))
  echo ${line[(($NF-1))]}
done

but does not work for for sh. i get the following error:

Code:
read: Illegal option -a

if i try with the original -A which you had, i still get:

Code:
read: Illegal option -A

i care about this because there are some old systems we have here that dont have bash. they just have sh. systems such as AIX, SunOS.

any suggestions on how to circumvent this?
 

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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)
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