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Full Discussion: Why the results of these two code fragments are not the same?
Top Forums Shell Programming and Scripting Why the results of these two code fragments are not the same? Post 303030173 by johnprogrammer on Thursday 7th of February 2019 01:13:33 AM
Old 02-07-2019
Quote:
Originally Posted by Don Cragun
But, the code you've written in your shell scripts acts more like your C++ code with the inner loop changed from:
Code:
    for(vector<string>::size_type j= i+ 1; j< myvector.size(); ++j)

to:
Code:
    for(vector<string>::size_type j= 0; j< myvector.size(); ++j)


Yes you are right.



Quote:
There doesn't appear to be any attempt to keep from checking one element against itself in your command-line argument vector in either of your shell scripts.

I repeat: "What is the logic in both of your scripts behind the variable named counter? Why does it matter what the value of $counter is when trying to determine whether or not two command-line arguments are the same?"

When the shell script starts, both arg1 and arg2 have the same value.

So I use the counter with value 0, to determine this case, and advance the second for-loop to the next argument, and from there, I check if arg2=arg1.


If the second loop ends, the first loop progresses to the next argument.

The second loop restarts again with the first argument, and proceeds until it meets the first loop, where arg2=arg1 and counter -eq 0.

arg2 then proceeds to the next argument, until it ends, if no duplicate arguments found.

Then the first loop progresses to the next argument. etc.

The code that works, is the first I posted, and is this:

Code:
#!/bin/sh

for arg1 in "$@"
do
    counter=0


   for arg2 in "$@"
   do

     if [ "$arg2" = "$arg1" ] && [ $counter -eq 0 ]
     then
       counter=$((counter+1))

       continue 
    fi


   if [ "$arg2" = "$arg1" ]
   then
    
     echo
     echo "Error: Two or more arguments are the same."
     echo
     echo "Exiting..."
     echo

     exit 1
    fi

  done

done

exit 0

 

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LEARN ABOUT DEBIAN

shevek_ristring

shevek::ristring(3)					     Library Functions Manual					       shevek::ristring(3)

NAME

       shevek::ristring -

       shevek::ristring is identical to shevek::istring, but it uses std::string instead of Glib::ustring.

SYNOPSIS

       #include <iostring.hh>

   Public Member Functions
       ristring ()
	   Create a new istring with no data.
       ristring (std::string const &str)
	   Create a new istring with data.
       void init (std::string const &str)
	   Set new data to an existing istring.
       void push ()
	   Push the current position to the stack so it can be restored later.
       int pop (bool keep=false)
	   Pop the last pushed position from the stack.
       void reset ()
	   Set the current position to 0, but don't change the stack.
       std::string rest () const
	   Get remaining string.
       void skip (std::string::size_type p)
	   Skip some characters.
       bool operator() (std::string const &format)
	   Read a constant string from the input.
       template<typename T1 > bool operator() (std::string const &format, T1 &arg1)
	   Read a string containing one argument from the input.
       template<typename T1 , typename T2 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2)
	   Read a string containing two arguments from the input.
       template<typename T1 , typename T2 , typename T3 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3)
	   Read a string containing three arguments from the input.
       template<typename T1 , typename T2 , typename T3 , typename T4 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3,
	   T4 &arg4)
	   Read a string containing four arguments from the input.
       template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 > bool operator() (std::string const &format, T1 &arg1, T2
	   &arg2, T3 &arg3, T4 &arg4, T5 &arg5)
	   Read a string containing five arguments from the input.
       template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 > bool operator() (std::string const &format, T1
	   &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5, T6 &arg6)
	   Read a string containing six arguments from the input.
       template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 > bool operator() (std::string
	   const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5, T6 &arg6, T7 &arg7)
	   Read a string containing seven arguments from the input.
       template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 > bool operator()
	   (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5, T6 &arg6, T7 &arg7, T8 &arg8)
	   Read a string containing eight arguments from the input.

   Static Public Member Functions
       template<typename T > static T direct (std::string const &data, std::string const &format, T def=T())
	   Read a variable from given data and return it.

Detailed Description
       shevek::ristring is identical to shevek::istring, but it uses std::string instead of Glib::ustring.

Member Function Documentation
   template<typename T > static T shevek::ristring::direct (std::string const &data, std::string const &format, Tdef = T ()) [inline, static]
       Read a variable from given data and return it. This allows using a shevek::istring in an expression without the need to create a new
       variable for it. If the input doesn't match the format, def is returned.

   int shevek::ristring::pop (boolkeep = false)
       Pop the last pushed position from the stack. If keep is true or not given, the current position is restored to the last position. If it is
       false, the current position is not changed.

Author
       Generated automatically by Doxygen for libshevek from the source code.

libshevek							  Fri May 11 2012					       shevek::ristring(3)
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