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Full Discussion: Resolving a parameter which is passed as parameter
Top Forums Shell Programming and Scripting Resolving a parameter which is passed as parameter Post 302860231 by barath on Saturday 5th of October 2013 06:25:35 AM
Old 10-05-2013
Hammer & Screwdriver Resolving a parameter which is passed as parameter
Hi,
I have the following files.
->cat scr.sh
Code:
export TMP_DIR=/home/user/folder1
export TMP_DIR_2=/home/user/folder2
while read line
do
cat "$line"
done<file_list.dat

------------------------
-> cat file_list.dat
Code:
$TMP_DIR/file1.txt
$TMP_DIR_2/file2.txt

---------------------------
-> cat /home/user/folder1/file1.txt
Code:
This is data from file1

---------------------------
-> cat /home/user/folder2/file2.txt
Code:
This is data from file2

-------------------------------
**************************************************
In the above code when I execute the scr.sh file, variable $TMP_DIR and $TMP_DIR_2 are not getting resolved. instead the error it shows file not available:$TMP_DIR/file1.txt .
My objective is to get the content of file1 and file2 inside scr.sh for further processing.
Could someone please help me on this.

Thanks in advance
TSB
Last edited by radoulov; 10-05-2013 at 08:37 AM..
 

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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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