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Full Discussion: Problem in sending inputs to format command using expect
Top Forums Shell Programming and Scripting Problem in sending inputs to format command using expect Post 302786411 by DGPickett on Wednesday 27th of March 2013 11:41:29 AM
Old 03-27-2013
What good is a partition of size zero?

Expect runs in tcl, as I recall, so there may be looping constructs in tcl you can include. The man page does not show and flow of control commands: Man Page for expect (all Section 0) - The UNIX and Linux Forums You could generate the expect script using a shell loop. You can generate it on the fly as a named pipe or with commands from stdin in interactive mode:

The -f flag prefaces a file from which to read commands from. The flag
itself is optional as it is only useful when using the #! notation (see
above), so that other arguments may be supplied on the command line.
(When using Expectk, this option is specified as -file.)

By default, the command file is read into memory and executed in its
entirety. It is occasionally desirable to read files one line at a
time. For example, stdin is read this way. In order to force arbi-
trary files to be handled this way, use the -b flag. (When using
Expectk, this option is specified as -buffer.)Notethatstdio-buffering-
maystilltakeplacehoweverthisshouldn'tcauseproblemswhenreadingfromafi-
foorstdin.

If the string "-" is supplied as a filename, standard input is read
instead. (Use "./-" to read from a file actually named "-".)

The -i flag causes Expect to interactively prompt for commands instead
of reading them from a file. Prompting is terminated via the exit com-
mand or upon EOF. See interpreter (below) for more information. -i is
assumed if neither a command file nor -c is used. (When using Expectk,
this option is specified as -interactive.)

-- may be used to delimit the end of the options. This is useful if
you want to pass an option-like argument to your script without it
being interpreted by Expect. This can usefully be placed in the #!
line to prevent any flag-like interpretation by Expect. For example,
the following will leave the original arguments (including the script
name) in the variable argv.

#!/usr/local/bin/expect --

 Note that the usual getopt(3) and execve(2) conventions must be
observed when adding arguments to the #! line.
 

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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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