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All programming languages have the capability to repeat blocks of code for a specified number of iterations. This makes performing repetitive actions very easy for a wellwritten program. The Bourne shell is no exception. It features a for loop, which repeats the actions of a code block for a specified number of iterations, as defined by a set of consecutive arguments to the for command. It also features a while loop and an until loop. In addition, an iterator is available within the code block to indicate which of the sequence of iterations that will be performed is currently being performed. If that sounds a little complicated, take a look at the following concrete example, which uses a for loop to generate a set of filenames. These filenames are then tested using the test facility, to determine whether they exist.

Before you start the trip, you will see a Start button in the lower-right corner of the screen. Tap the Start button, and the routing directions begin. The Start button changes to arrow icons that allow you to move between the steps in the trip.

#!/bin/bash for i in apple orange lemon kiwi guava do DATAFILE=$i".dat" echo "Checking" $DATAFILE if test -s $FILENAME

Part II:

JOIN with table aliases instead of table names:

You can move the screen with your finger to look at the route, or just touch the arrows at the bottom to show the route in step-by-step snapshots.

The for loop is repeated five times, with the variable $i taking on the values apple, orange, lemon, kiwi, and guava. Thus, on the first iteration, when $i=apple, the shell interprets the for loop in the following way:

FILENAME="apple.dat" echo "Checking apple.dat" if test -s apple.dat then echo "apple.dat has zero-length" else echo "apple.dat is OK" fi

Before you start your directions, you can choose whether you are driving, using public transportation, or walking by tapping the icons on the left side of the blue bar at the top of the directions screen, as shown in Figure 22 11.

If you run this script in a directory with files of zero length, you would expect to see the following output:

SELECT MOVIE_ID, MOVIE_GENRE_DESCRIPTION AS GENRE, MOVIE_TITLE FROM MOVIE A JOIN MOVIE_GENRE B ON A.MOVIE_GENRE_CODE = B.MOVIE_GENRE_CODE ORDER BY MOVIE_ID;

$ ./zero_length_check.sh Checking apple.dat apple.dat is zero-length Checking orange.dat orange.dat is zero-length Checking lemon.dat lemon.dat is zero-length Checking kiwi.dat kiwi.dat is zero-length Checking guava.dat guava.dat is zero-length

To reverse the route, touch the Reverse button, which is at the top between the Start and End fields. This can be useful if you re not great about reversing directions on your own or if your route uses lots of one-way streets.

However, if you entered data into each of the files, you should see them receive the OK message:

$ ./zero_length_check.sh Checking apple.dat apple.dat is OK Checking orange.dat orange.dat is OK Checking lemon.dat lemon.dat is OK Checking kiwi.dat kiwi.dat is OK

Currently, the only setting that affects your Maps app is Location Services, which is critical for determining your current location. 1. 2. 3. Touch the Settings icon. Tap the General tab in the left column. Now find the Location Services switch about halfway down. Move this switch to the ON position so that Maps can approximate your location.

JOIN with the USING keyword (instead of the ON condition). This is a very nice shorthand option when the columns in the two tables have the same name. However, it is a very new standard, so as of this writing, only Oracle and MySQL support this syntax (Microsoft SQL Server and DB2 do not).

7:

In the previous example, you assigned different values to a shell variable, which was used to generate filenames for checking. It is common to modify variables within scripts by using export, and to attach error codes to instances where variables are not defined within a script. This is particularly useful if a variable that is available within a user s interactive shell is not available in their noninteractive shell. For example, you can create a script called show_errors.sh that returns an error message if the PATH variable is not set: