strcat equivalent in shell scripting Post: 302270711

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Top Forums Shell Programming and Scripting strcat equivalent in shell scripting Post 302270711 by ramen_noodle on Monday 22nd of December 2008 03:12:56 PM

12-22-2008

Registered User

Vgersh is very good at this type of problem and I don't want to but in, but most cases, in most shells, using an array to store the data and exploding the array is a simple way to form a concatenated string of disparate variables.

Short example with bash and gawk.

Code:

function retrandstr() {
gawk '
  function retrandchars(str, sz,rval,i) {
  sz = int(1 + rand() * length(str))
  i =0
        #print sz, i; 
         while (i < sz) {
                rval = rval substr(str,int((1 + rand() * length(str))),1); 
                i++;
          }
  return rval
  }
  BEGIN {
    srand();
    print retrandchars("abndhcv784893ndyvurfgh3ery348infy7478")
  }'
  sleep 1
}

Test--
while test "$i" -gt 0;  do arr[$i]=`retrandstr`; i=`expr $i - 1`;  done
list=${arr[@]}

ramen_noodle

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igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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