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Full Discussion: Find missed numbers
Top Forums Shell Programming and Scripting Find missed numbers Post 302774191 by DGPickett on Friday 1st of March 2013 11:17:43 AM
Old 03-01-2013
One loop:
Code:
x=0 
c=0
 
while (( ++x <= 999999 ))
 do
  if (( x > c ))
   then
    read c
    if [ $? = 1 ]
     then
      c=1000000
     fi
   fi
  if (( x < c ))
   then
    echo $x
   fi
 done < infile

You need to check/generate all million numbers and then filter them with file numbers. Disposing of the edge cases tersely, never the same test twice, is important in getting a clean, minimal code. This ran almost 2 minutes for me. I could get smaller using the ternary operator '? :', but I am usually a ksh guy:
Code:
$ echo $(( 0 > 1 ? 2 : 3 ))
ksh:  0 > 1 ? 2 : 3 : syntax error
$ bash -c 'echo $(( 0 > 1 ? 2 : 3 ))'
3
$

Indentation indicates which line controls which. You, too, deserve properly indented code. It's an investment in your future.

If this is schoolwork, one needs to fill out a template.

Last edited by DGPickett; 03-01-2013 at 12:41 PM..
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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