help for shell script of finding shortest substring from given string by user Post: 302146759

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Top Forums Shell Programming and Scripting help for shell script of finding shortest substring from given string by user Post 302146759 by pankajd on Thursday 22nd of November 2007 06:31:13 AM

11-22-2007

Registered User

help for shell script of finding shortest substring from given string by user

please give me proper solution for finding a shortest substring from given string if string itself and first char and last char of that substr are also given by user

if S="dpoaoqooroo" and FC="o" and LC="o",then shortest substr is "oo" and rest of the string is "dpoaoqroo"
i have code but it is not working properly....so if u can give some new code or modify below code..
echo "enter the string"
read str
echo -e "\nenter first char of the substring"
read fc
echo -e "\nenter last char of the substring"
read lc
len=${#str}
no=`echo "$str" |awk -F "$lc" '{print NF}'`
no1=`echo "$str" |awk -F "$fc" '{print NF}'`
fci=`expr index "$str" $fc`
lci=`expr index "$str" $lc`
if {(test $no -eq 1 || test $no1 -eq 1)}
then
echo "substring not found 1"
exit 0
fi
flag=0
olen=0
ip2=""
for ((i=1;i<=$(($no-1));i++))
do
ip1=`echo "$str" |cut -d "$lc" -f$i`
echo "ip1 for $i times is $ip1"
len1=${#ip1}
ip2=${ip1##**$fc}
echo "ip2 for $i times is $ip2"
len2=${#ip2}
fcin=`expr index "$ip1" $fc`
if {(test $flag -eq 0 && test $len1 -ne 0 && test $fcin -ne 0)}
then
oip2=$ip2
olen=$len2
flag=1
key=1
else
if {(test "$olen" -gt "$len2" && test "$len1" -ne 0 && test "$fcin" -ne 0)}
then
oip2=$ip2
olen=$len2
key=1
fi fi
done
if (test "$key" = 1 )
then
echo "last shortest string is \"$fc$oip2$lc\""
str2=`echo ${str/$fc$oip2$lc/""}`
echo "the rest of the string is \"$str2\""
else
echo "substring not found last"
fi

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LEARN ABOUT SUNOS

strfind

strfind(3GEN)					     String Pattern-Matching Library Functions					     strfind(3GEN)

NAME

       strfind, strrspn, strtrns, str - string manipulations

SYNOPSIS

       cc [ flag ... ] file ... -lgen [ library ... ]
       #include <libgen.h>

       int strfind(const char *as1, const char *as2);

       char *strrspn(const char *string, const char *tc);

       char * strtrns(const char *string, const char *old, const char *new, char *result);

DESCRIPTION

       The  strfind()  function  returns the offset of the first occurrence of the second string,  as2, if it is a substring of string as1. If the
       second string is not a substring of the first string strfind() returns  -1.

       The strrspn() function trims chartacters from a string. It searches from the end of string for the first character that is not contained in
       tc. If such a character is found, strrspn() returns a pointer to the next character; otherwise, it returns a pointer to string.

	The  strtrns()	function transforms  string and copies it into	result. Any character  that appears in	old is replaced with the character
       in the same position in	new. The  new result is returned.

USAGE

       When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line.  This flag should only be used in  mul-
       tithreaded applications.

EXAMPLES

       Example 1: An example of the strfind() function.

       /* find offset to substring "hello" within as1 */
       i = strfind(as1, "hello");
       /* trim junk from end of string */
       s2 = strrspn(s1, "*?#$%");
       *s2 = '';
       /* transform lower case to upper case */
       a1[] = "abcdefghijklmnopqrstuvwxyz";
       a2[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
       s2 = strtrns(s1, a1, a2, s2);

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       string(3C), attributes(5)

SunOS 5.10							    20 Jan 1999 						     strfind(3GEN)