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Full Discussion: Command not found error
Top Forums UNIX for Dummies Questions & Answers Command not found error Post 302838785 by chip on Tuesday 30th of July 2013 01:06:11 PM
Old 07-30-2013
Command not found error
Code:
[_@_ ~]$ cat nu
who | wc -l
[_@_ ~]$ ls -l nu
-rwxr-x--- 1 _ _ 11 Jul 30 12:37 nu //the nu is displayed in green color
[_@_ ~]$ nu
bash: nu: command not found

I am using a book from 1986 on Unix System V, Release 3, and the Unix system I am connecting to is from my college.

Below is the notes from the book:

//whenever you type something like this: who | wc -l, you are actually programming in the shell! thats because the shells the
//one thats interpreting the command line, recognizing the pipe symbol, connecting the output of the first command to the input
//of the second, and initiating execution of both commands

//a shell program can be written directly at the terminal, as in who | wc -l, or it can be typed into a file and then the file
//can be executed by the shell. this is useful when you need to perform a task several times a day

//before you can run a file with commands, you need to first make it executable. this is done by changing command mod "chmod",
//and to make it executable

chmod +x file(s) //makes listed file(s) executable by changing its mode command

//the shell requires that a file be both readable and executable to be run
 

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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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