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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 303030162 by johnprogrammer on Wednesday 6th of February 2019 08:41:52 PM
Old 02-06-2019
Why the results of these two POSIX shell code fragments, are not the same?
Code 1:

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

It outputs:
Code:
[john@manjaromatepc Downloads]$ ./script.sh ~/Documents/ ~/Downloads/
[john@manjaromatepc Downloads]$

Code 2:

Code:
#!/bin/sh


for arg1 in "$@"
do
  
  counter=0

  for arg2 in "$@"
  do


    if [ $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

It outpouts:

Code:
 
[john@manjaromatepc Downloads]$ ./script.sh ~/Documents/ ~/Downloads/

Error: Two or more arguments are the same.

Exiting...

[john@manjaromatepc Downloads]$

Last edited by johnprogrammer; 02-06-2019 at 10:49 PM.. Reason: The second code fragment has a logical mistake
 

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LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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