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The function is an element that can be very useful in longer shell scripts. A function is a subroutine in a script that is labeled with a name. Using functions makes it easier to refer to certain command sequences that have to be used more than once in a script. For instance, you could create a generic error message if something went wrong. You can define functions in two ways. You can use something like: function functionname { command1 command2 commandn }

CommandText is just a string, so you can print it with Console.WriteLine() just like any other string. The SQL will return the number of employees in the Northwind Employees table

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Or you could do it this way: functionname () { command1 command2 commandn } To increase the readability of a script, it s a good idea to use functions if certain code sequences are needed more than once. Listing 7-33 is an example of a script in which a function is used to display an error message. This script is a replacement for the file command, with the difference that the script displays a more elegant error message. Listing 7-33. Displaying Error Codes Using Functions #!/bin/bash # This script shows the file type # # usage: filetype $1 function noarg { echo "You have made an error" echo "When running this script, you need to specify the name of the file" echo "that you want to check" exit 1 } if [ -z $1 ]; then noarg else file $1 fi exit 0 In Listing 7-33, the function has the name noarg. In it, some text is specified that has to be echoed to the screen when the function is called. The function basically defines an error message, and so it makes sure that the script terminates with an exit status of 1. As you can see, the function is called just once in this script, when a user forgets to enter the required argument.

Figure 5-7.Viewing the newly created table in tempdb A temporary table can reside in the tempdb database as long as you have the query window open. If you close the query window from which you created your temporary table, and regardless of whether you saved the query, the temporary table will be automatically deleted from tempdb. Once the table is created, you can use it like any other table (see Figure 5-8).

You can set both of these properties when you create the command with yet another variation of its constructor, as shown here:

' Create a command with both text and connection Dim sql = _ "select " _ & " count(*) " _ & "from " _ & " employees" cmd = new SqlCommand(sql, conn)

Let s discuss one more script, one that provides a rather complex example in which process activity is monitored (see Listing 7-34). To do this, the script will periodically check the most active process and, if this script s activity rises above a threshold, it will send an e-mail to the user root.

Figure 5-8. Retrieving data from your temporary table Temporary tables will also be deleted if you close SSMSE, because the tempdb database gets rebuilt every time you close and open SSMSE again.

This is equivalent to the previous code that assigns each property explicitly. This is the most commonly used variation of the SqlCommand constructor, and you ll use this one for the rest of the chapter.

Listing 7-34 Complex Scripting Example #!/bin/bash # Script that monitors the top-active process The script sends an email to the user # root if utilization of the top active process goes beyond 80% Of course, this # script can be tuned to do anything else in such a case # # Start the script, and it will run forever while true do # Check if we have a process causing high CPU load every 60 seconds sleep 10 BLAH=`ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1` USAGE=`echo $BLAH | awk '{ print $1 }'` USAGE=${USAGE%*} PID=`echo $BLAH | awk '{print $2 }'` PNAME=`echo $BLAH | awk '{print $3 }'` # Only if we have a high CPU load on one process, run a check within 7 sec.

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