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File is a special block file File is a special character file File is a directory File is a normal file File is a symbolic link File is a named pipe File has nonzero size File is writeable by the current user File is executable by the current user
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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.
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#!/bin/bash for i in apple orange lemon kiwi guava do DATAFILE=$i".dat" echo "Checking" $DATAFILE if test -s $FILENAME
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then echo "$DATAFILE "has zero-length" else echo $FILENAME "is OK" fi done
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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:
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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
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If you run this script in a directory with files of zero length, you would expect to see the following output:
$ ./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
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
7:
Shells, Scripts, and Scheduling
Checking guava.dat guava.dat is OK
Using Shell Variables
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:
#!/bin/bash echo ${PATH: PATH_NOT_SET}
Of course, because the PATH variable is usually set, you should see output similar to the following:
$ ./path_set.sh /sbin:/bin:/usr/games/bin:/usr/sbin:/root/bin:/usr/local/bin: /usr/local/sbin/:/usr/bin: /usr/X11R6/bin: /usr/games:/opt/gnome/bin:/opt/kde/bin
However, if PATH was not set, you would see the following error message:
./show_errors.sh: PATH_NOT_SET
You can use system-supplied error messages as well, by not specifying the optional error string:
$ ./path_set.sh #!/bin/bash echo ${PATH: }
Thus, if the PATH variable is not set, you would see the following error message:
$ ./path_set.sh ./showargs: PATH: parameter null or not set
You can also use the numbered shell variables ($1, $2, $3, and so on) to capture the space-delimited output of certain commands, and perform actions based on the value of these variables, using the set command. For example, the command
$ set `ls`
Part II:
System Essentials
sequentially assigns each of the fields within the returned directory listing to a numbered shell variable. For example, if the directory listing contains the entries
apple.dat guava.dat kiwi.dat lemon.dat orange.dat
you could retrieve the values of these filenames by using the echo command:
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