Case switching Post: 302943386

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

05-08-2015

Registered User

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?

Tuxidow

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checkbashisms

CHECKBASHISMS(1)					      General Commands Manual						  CHECKBASHISMS(1)

NAME

       checkbashisms - check for bashisms in /bin/sh scripts

SYNOPSIS

       checkbashisms script ...
       checkbashisms --help|--version

DESCRIPTION

       checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence
       of bashisms.  It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected.

       Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported  by  POSIX";
       this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability.

       In  cases  where  POSIX	and  Debian  Policy  disagree, checkbashisms by default allows extensions permitted by Policy but may also provide
       options for stricter checking.

OPTIONS

       --help, -h
	      Show a summary of options.

       --newline, -n
	      Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.)

       --posix, -p
	      Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n).

       --force, -f
	      Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears
	      to be a shell wrapper).

       --extra, -x
	      Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi-
	      tive which may be ignored.  For example, the use of "$BASH_ENV" may be preceded by checking whether "$BASH" is set.

       --version, -v
	      Show version and copyright information.

EXIT VALUES

       The exit value will be 0 if no possible bashisms or other problems were detected.  Otherwise it will be the sum of the following error val-
       ues:

       1      A possible bashism was detected.

       2      A file was skipped for some reason, for example, because it was unreadable or not found.	The warning message will give details.

SEE ALSO

       lintian(1).

AUTHOR

       checkbashisms  was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by
       Julian Gilbey <jdg@debian.org>.

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								 Debian Utilities						  CHECKBASHISMS(1)