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Full Discussion: For loop to break apart word
Top Forums Shell Programming and Scripting For loop to break apart word Post 302778361 by Don Cragun on Sunday 10th of March 2013 03:52:13 PM
Old 03-10-2013
Here is another example of how to do this that uses a function to split strings into arrays and then compares the array elements. This script uses several extensions to the standards, but works with recent versions of both ksh and bash:
Code:
#!/bin/ksh
# Usage: tryme string1 string2 [stringX stringX+1]...
# DESCRIPTION:
#       The tryme utility will demonstrate the use of the split2() shell
#       function by calling it twice for each pair of operands supplied.  It
#       then reports whether each pair of characters in the corresponding
#       strings match.
split2() {
# Usage: split2 arrray_name string
# DESCRIPTION:
#       The split2 function will split string into 2 character pairs and assign
#       those pairs to elements of the array specified by array_name with
#       subscripts starting with 1.  If string consists of an odd number of
#       characters, the last element assigned to the array will only contain
#       one character.
        s2_tmp2=1
        for((s2_tmp1 = 0; s2_tmp1 < ${#2}; s2_tmp1 += 2))
        do
                eval $1[$s2_tmp2]=${2:$s2_tmp1:2}
                s2_tmp2=$((s2_tmp2 + 1))
        done
}
while [ $# -ge 2 ]
do
        printf "Processing %s and %s\n" "$1" "$2"
        split2 v1 "$1"
        split2 v2 "$2"
        if [ ${#v1[@]} -ge ${#v2[@]} ]
        then    m=${#v1[@]}
        else    m=${#v2[@]}
        fi
        for((i = 1; i <= m; i++))
        do      printf "v1[%d]=%s, v2[%d]=%s\n" $i "${v1[$i]}" $i "${v2[$i]}"
                if [[ "X${v1[$i]}" == "X${v2[$i]}" ]]
                then    printf "v1[%d] is the same as v2[%d]\n" $i $i
                else    printf "v1[%d] is not the same as v2[%d]\n" $i $i
                fi
        done
        shift 2
done

An example using this script is:
Code:
tryme excellency exbeuukknn 12345 abc

which produces the output:
Code:
Processing excellency and exbeuukknn
v1[1]=ex, v2[1]=ex
v1[1] is the same as v2[1]
v1[2]=ce, v2[2]=be
v1[2] is not the same as v2[2]
v1[3]=ll, v2[3]=uu
v1[3] is not the same as v2[3]
v1[4]=en, v2[4]=kk
v1[4] is not the same as v2[4]
v1[5]=cy, v2[5]=nn
v1[5] is not the same as v2[5]
Processing 12345 and abc
v1[1]=12, v2[1]=ab
v1[1] is not the same as v2[1]
v1[2]=34, v2[2]=c
v1[2] is not the same as v2[2]
v1[3]=5, v2[3]=
v1[3] is not the same as v2[3]

This User Gave Thanks to Don Cragun For This Post:
SkySmart
 

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LEARN ABOUT REDHAT

array

array(n)						       Tcl Built-In Commands							  array(n)

__________________________________________________________________________________________________________________________________________________

NAME

       array - Manipulate array variables

SYNOPSIS

       array option arrayName ?arg arg ...?
_________________________________________________________________

DESCRIPTION

       This  command  performs	one  of several operations on the variable given by arrayName.	Unless otherwise specified for individual commands
       below, arrayName must be the name of an existing array variable.  The option argument determines what action is carried out by the command.
       The legal options (which may be abbreviated) are:

       array anymore arrayName searchId
	      Returns  1  if  there  are  any more elements left to be processed in an array search, 0 if all elements have already been returned.
	      SearchId indicates which search on arrayName to check, and must have been the return value  from	a  previous  invocation  of  array
	      startsearch.   This  option  is particularly useful if an array has an element with an empty name, since the return value from array
	      nextelement won't indicate whether the search has been completed.

       array donesearch arrayName searchId
	      This command terminates an array search and destroys all the state associated with that search.  SearchId indicates which search	on
	      arrayName to destroy, and must have been the return value from a previous invocation of array startsearch.  Returns an empty string.

       array exists arrayName
	      Returns 1 if arrayName is an array variable, 0 if there is no variable by that name or if it is a scalar variable.

       array get arrayName ?pattern?
	      Returns  a  list containing pairs of elements.  The first element in each pair is the name of an element in arrayName and the second
	      element of each pair is the value of the array element.  The order of the pairs is undefined.  If pattern is not specified, then all
	      of  the  elements of the array are included in the result.  If pattern is specified, then only those elements whose names match pat-
	      tern (using the matching rules of string match) are included.  If arrayName isn't the name of an array variable,	or  if	the  array
	      contains no elements, then an empty list is returned.

       array names arrayName ?pattern?
	      Returns  a  list	containing  the  names	of all of the elements in the array that match pattern (using the matching rules of string
	      match).  If pattern is omitted then the command returns all of the element names in the array.  If there are no (matching)  elements
	      in the array, or if arrayName isn't the name of an array variable, then an empty string is returned.

       array nextelement arrayName searchId
	      Returns  the  name  of  the next element in arrayName, or an empty string if all elements of arrayName have already been returned in
	      this search.  The searchId argument identifies the search, and must have been the return value  of  an  array  startsearch  command.
	      Warning:	 if elements are added to or deleted from the array, then all searches are automatically terminated just as if array done-
	      search had been invoked; this will cause array nextelement operations to fail for those searches.

       array set arrayName list
	      Sets the values of one or more elements in arrayName.  list must have a form like that returned by array get, consisting of an  even
	      number  of elements.  Each odd-numbered element in list is treated as an element name within arrayName, and the following element in
	      list is used as a new value for that array element.  If the variable arrayName does not already exist and list is  empty,  arrayName
	      is created with an empty array value.

       array size arrayName
	      Returns a decimal string giving the number of elements in the array.  If arrayName isn't the name of an array then 0 is returned.

       array startsearch arrayName
	      This  command initializes an element-by-element search through the array given by arrayName, such that invocations of the array nex-
	      telement command will return the names of the individual elements in the array.  When the search has been completed, the array done-
	      search  command  should  be invoked.  The return value is a search identifier that must be used in array nextelement and array done-
	      search commands; it allows multiple searches to be underway simultaneously for the same array.					   |

       array unset arrayName ?pattern?														   |
	      Unsets all of the elements in the array that match pattern (using the matching rules of string match).  If arrayName isn't the  name |
	      of an array variable or there are no matching elements in the array, then an empty string is returned.  If pattern is omitted and is |
	      it an array variable, then the command unsets the entire array.

KEYWORDS

       array, element names, search

Tcl									8.3								  array(n)
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