Data Encryption Post: 302953927

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Top Forums Shell Programming and Scripting Data Encryption Post 302953927 by MadeInGermany on Wednesday 2nd of September 2015 04:15:46 PM

09-02-2015

Registered User

Comments on the the previous solution:
The split() and the following loop are static; it is more efficient to place them in the BEGIN section.
And in the main section it is better to initialize a loop variable (use a for loop!), in case there is more than one line.
The split( , , "") is not understood by all awk versions, others might need

Code:

lenA=split("a b c d e f g ...", A)

--
Here is a solution with a string

Code:

 cat file
abc1,abc2,abc3,abc4

Code:

 cat crypt3.sh
awk -F, -v OFS=, '
BEGIN {
  chars="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
  lchars=length(chars)
}
function crypt(s) {
  s1=""
  for (pos=1; pos<=length(s); pos++) {
    c=substr(s,pos,1)
    i=index(chars,c)
    c1=substr(chars,1+(1+i)%lchars,1)
    s1=s1 (i>0 ? c1 : c)
  }
  return s1
}
{
  $3=crypt($3)
  print
}
' "$@"

Code:

 sh crypt3.sh file
abc1,abc2,cde3,abc4

Last edited by MadeInGermany; 09-02-2015 at 05:28 PM.. Reason: retain characters that do not match

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REPLACE(1)						      General Commands Manual							REPLACE(1)

NAME

       replace	-  A utility program that is used by msql2mysql, but that has more general applicability as well. replace changes strings in place
       in files or on the standard input. Uses a finite state machine to match longer strings first. Can be used to swap strings.

USAGE

       replace [-?svIV] from to from to ... -- [files]

       or

       replace [-?svIV] from to from to ... < fromfile > tofile

SYNOPSIS

       replace [-?|-I] [-s] [-v]

DESCRIPTION

       replace

       -?|-I  info

       -s     silent

       -v     verbose

EXTRA INFO

       Special characters in from string:

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       $     Match end of line.

            Match space-character, start of line or end of line. For a end  the next replace starts locking at the end space-character.  A	
	      alone in a string matches only a space-character.

EXAMPLE

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SEE ALSO

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AUTHOR

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       no  warranty.  Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mer-
       curmedia.com)

								 20 December 2000							REPLACE(1)

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