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Full Discussion: Case switching
Top Forums Shell Programming and Scripting Case switching Post 302943386 by Tuxidow on Friday 8th of May 2015 04:47:11 AM
Old 05-08-2015
Case switching

Hello Folks

I am writing this simple program but I am stuck at this point. Here is the snippet from my script where I have issues.

Code:
3)     echo "Current Directory:   $(pwd)                Menu 3"

      echo -e "Enter a file name\n"
      read fname
      if [ -f $name ]
      then

              if [ -x $name ]
              then
                cat $name
              else
                echo "You do not have access to file $name"
              fi
      else
                 echo "File $name doesn't exist"
        
                echo -e "Press Enter to return to the Main Menu\c"
                read dummy
        fi
;;

4)      clear
        
        echo "Current Directory:   $(pwd)                Menu 4"

        echo  -e "Enter a directory name\n"
        read dname
        if [ -d $dname ]
        then
                cd $dname
                if [ $? -eq 0 ]
                then
                        continue
                else
                        echo "Directory $dname not accessible"
        
                fi
        else
                echo "Subdirectory $dname does not exist."
        
                echo -e "Press Enter to return to the Main Menu\c"
                read dummy
        fi

This is a section of the script where it takes entry either 3 or 4. If 3 is selected it prompts for the user to enter filename and if the user is hitting just enter and not any filename, it should return to main menu. But that's not happening, its just looping around and waiting for an input. But if 4 is selected and an enter is pressed with out directory name it goes to that cd $dname part and moves to main menu. Since $dname is empty as the user has not provided any value it goes to home directory of the user.

My requirement is that the script should go back to main menu if the user hits just "enter" with out any value. How can I achieve that?
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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