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Full Discussion: "Help debug the shell script"
Top Forums UNIX for Beginners Questions & Answers "Help debug the shell script" Post 303035746 by bghosh on Sunday 2nd of June 2019 01:19:31 AM
Old 06-02-2019
"Help debug the shell script"
Hello All,

I have got a section of shell script which was working earlier but now it is giving some different results:

Code:
MSG=

 while  true
 do
    themenu
    getchar =
 
   case $answer in
       1) export_Config_tables;;
	   2) export_config_tables_file;;
       3) export_Accounts_tables;;
       4) export_both_tables;;
	   5) load_config_tables;;
	   6) load_config_tables_file;;
	  x|X) break;;
	q|Q) break;;
	d|D) toggle_debug;;
         *) badchoice;;
  
   esac
  done
clear


------- the menu function ---------
themenu () {
clear
echo `date `
echo
echo " summit Data Extract utility   (SOPRA v1.1)"
echo
 echo
 echo  "1.  Extract summit configuration data only"    
 echo  "2.  Extract summit config data in flat files only"
 echo  "3.  Extract summit account data only"
 echo  "4.  Extract all data "
 echo  "5.  Load summit configuration data from Dump"    
 echo  "6.  Load summit config data from flat files only"
 echo
 echo
 echo  "x.  Exit"
 echo
 echo $MSG
 echo
 echo "Select option : ";
 }

------ the getchar function -----------------

getchar (){
    	stty raw
	answer=`dd bs=1 count=1 2> /dev/null `
	stty -raw
}	

------ the bad choice function -------
badchoice () {
 MSG="Invalid menu choice"
}

After executing the script, it displays the menu


Code:
<System date>

summit Data Extract utility   (SOPRA v1.1)

Code:
1.  Extract summit configuration data only    
 2.  Extract summit config data in flat files only
 3.  Extract summit account data only
 4.  Extract all data 
 5.  Load summit configuration data from Dump
 6.  Load summit config data from flat files only
 
 
 x.  Exit

 Select option :

User inputs 5, but it doesn't display on the screen and after pressing <Enter> 2-3 times, it displays the message : Invalid menu choice.

I am unable to figure out where it is causing problem ? The menu function executes fine, it causes problem when it enters getchar() function and the case statement.



Please suggest where it is going wrong and what I should correct in the script.

Thanks.
 

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LEARN ABOUT OSX

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-akq] [-t time] [file [command ...]]

DESCRIPTION

     The script utility makes a typescript of everything printed on your terminal.  It is useful for students who need a hardcopy record of an
     interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell.

     The following options are available:

     -a      Append the output to file or typescript, retaining the prior contents.

     -k      Log keys sent to program as well as output.

     -q      Run in quiet mode, omit the start and stop status messages.

     -t time
	     Specify time interval between flushing script output file.  A value of 0 causes script to flush for every character I/O event.  The
	     default interval is 30 seconds.

     The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if
     ignoreeof is not set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  The script utility works best with commands that do not
     manipulate the screen.  The results are meant to emulate a hardcopy terminal, not an addressable one.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell.  If SHELL is not set, the Bourne shell is assumed.  (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     The script utility places everything in the log file, including linefeeds and backspaces.	This is not what the naive user expects.

     It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.

     When running in -k mode, echo cancelling is far from ideal.  The slave terminal mode is checked for ECHO mode to check when to avoid manual
     echo logging.  This does not work when in a raw mode where the program being run is doing manual echo.

BSD
								 January 22, 2004							       BSD
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