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Top Forums Shell Programming and Scripting Passing Values from a shell script Post 302070639 by dhananjaysk on Thursday 6th of April 2006 09:33:54 AM
Old 04-06-2006
Please see the example

Quote:
Originally Posted by Abhishek Ghose
"." runs the script in current shell, as you said. The reason for doing this is we want B.sh to recognise the variable "var"(which can only be recognised in the shell that it was defined in)

If you are not planning to pass any variable, then rather use metohd 2. But a caveat: Method 2 implicitly assumes that your script understands certain variable names (like "var" in my examples). Basically , this means that you might not be able to re-use B.sh. Also, better check whether the variable in question is null first. In such a case, make B.sh throw out an error message and abort execution.

In which scenario did it hang? When the scripts were written according to method 1 or method 2?
A statement like X=`B.sh` might hang in scenario 1, as it expects a commandline input. But not sure.
My script code as follows
--------------------------------------------
. database_checking.sh

echo "Database Name" $db_name
echo "set feed off verify off pagesize 0
select username from user_users;"|sqlplus -s /@$db_name|read user_name
---------------------------------------------------------------

My database_checking.sh code follows which return db_name variable to above code....which is furthur used for retrieving username ...
-----------Start------------------------------------------------
db_var=1
while test $db_var -eq 1
do
echo "\n\t\t\tEnter Database Name"
echo "\t\t\t[ Example:marketbld.uk.d.ch ] or Press [ 'Q'/'q'] to exit :\c"
read db_name
func_meta_ch "$db_name"

if [ "!$db_name!" != "!!" -a $var_meta_ch -eq 0 ]
then
expr $db_name + 2 >/dev/null 2>&1
db_val=$?

if [ $db_val -ne 0 ]
then
echo "set feed off verify off pagesize 0
select count(1) from mktactivity;"|sqlplus -s /@$db_name|read sqldb_name

expr $sqldb_name + 2 >/dev/null 2>&1
db_cnt=$?

if [ "!$sqldb_name!" = "!ERROR:!" ]
then
echo "\t\t\tError: Database name entered does not exist."
else
if [ $db_cnt -ne 0 ]
then
echo "\t\t\tError: Database name entered does not exist."
else
db_var=2
fi
fi
else
echo "\t\t\tError: Database name entered does not exist."
fi
else
echo "\t\t\tError: Invalid Database name."
fi
done
echo $db_name

------------End ------------------
 

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exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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