11-22-2007
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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curs_instr(3X) curs_instr(3X)
NAME
instr, innstr, winstr, winnstr, mvinstr, mvinnstr, mvwinstr, mvwinnstr - get a string of characters from a curses window
SYNOPSIS
#include <curses.h>
int instr(char *str);
int innstr(char *str, int n);
int winstr(WINDOW *win, char *str);
int winnstr(WINDOW *win, char *str, int n);
int mvinstr(int y, int x, char *str);
int mvinnstr(int y, int x, char *str, int n);
int mvwinstr(WINDOW *win, int y, int x, char *str);
int mvwinnstr(WINDOW *win, int y, int x, char *str, int n);
DESCRIPTION
These routines return a string of characters in str, extracted starting at the current cursor position in the named window. Attributes are
stripped from the characters. The four functions with n as the last argument return a leading substring at most n characters long (exclu-
sive of the trailing NUL).
RETURN VALUE
All of the functions return ERR upon failure, or the number of characters actually read into the string.
X/Open defines no error conditions. In this implementation, if the window parameter is null or the str parameter is null, a zero is
returned.
NOTES
Note that all routines except winnstr may be macros.
PORTABILITY
SVr4 does not document whether a length limit includes or excludes the trailing NUL.
The ncurses library extends the XSI description by allowing a negative value for n. In this case, the functions return the string ending
at the right margin.
SEE ALSO
curses(3X).
curs_instr(3X)