4.0 What Is Given As given, the files of source.tbz implement the following. fs33% mkfs D1
creates an initially empty file volume on the simulated disk named D1.dsk. At this point, we do
not need to discuss all the specifics anout the structure of the disk fs33% ls prints a listing, much
like the Unix ls -lisa, of all the files in the root directory of the current file volume. Here is a
stdTestScriptP1.txt. Use it as in ./P0 < stdTestScriptP1.txt . 4.1 Redirection Implement
redirection for the given shell as discussed in class. Use the operator > to redirect the output of a
command into a file on the host's file system. It is safe to assume that the redirection operator
appears only once in the command line. 4.2 Piping Implement piping as discussed in class for
commands executed on the host. For example, the command !ls | !cat executes both commands
on the host. However, the piping needs to be performed in your shell! It is sufficent if your shell
supports single piping, i.e. the concatenation of two commands. Bonus points are available if you
achieve multiple piping. 4.3 Executing in the background Allow your shell to execute commands
in the background using the &. The command prompt should return immediately after issuing the
command no matter how long the execution takes. It is safe to assume that the character & only
appears once in the command. Your shell should support the execution of all types of commands
in the background, i.e. local commands operating on the virtual file system as well as commands
running on the host. 4.4 A Simple Test Session Only the additional elements compared to the
given source code are described below. Add these appropriately to the test script. Our path name
syntax is the same as Unix path names. Obviously, not every arbitrary string is a valid path or
name. Also, the dot and the dot-dot are not permissible as arguments in some contexts below.
Nevertheless these commands must be robust. fs33% ls > test lists the contents of the current
directory of our own file system and redirects the output into the file test of the local directory of
the host's file system. fs33% ls | !cat pipes the output of ls into the local command cat. fs33%
!cat test shows the contents of the file test of the host's file system (which should contain the
output of ls if previously executed as above). fs33% !sleep 15 & waits 15 seconds (since it is
executed in the background the command prompt should be available immediately, though). 5.
Turn In.
4-0 What Is Given As given- the files of source-tbz implement the foll.pdf
1. 4.0 What Is Given As given, the files of source.tbz implement the following. fs33% mkfs D1
creates an initially empty file volume on the simulated disk named D1.dsk. At this point, we do
not need to discuss all the specifics anout the structure of the disk fs33% ls prints a listing, much
like the Unix ls -lisa, of all the files in the root directory of the current file volume. Here is a
stdTestScriptP1.txt. Use it as in ./P0 < stdTestScriptP1.txt . 4.1 Redirection Implement
redirection for the given shell as discussed in class. Use the operator > to redirect the output of a
command into a file on the host's file system. It is safe to assume that the redirection operator
appears only once in the command line. 4.2 Piping Implement piping as discussed in class for
commands executed on the host. For example, the command !ls | !cat executes both commands
on the host. However, the piping needs to be performed in your shell! It is sufficent if your shell
supports single piping, i.e. the concatenation of two commands. Bonus points are available if you
achieve multiple piping. 4.3 Executing in the background Allow your shell to execute commands
in the background using the &. The command prompt should return immediately after issuing the
command no matter how long the execution takes. It is safe to assume that the character & only
appears once in the command. Your shell should support the execution of all types of commands
in the background, i.e. local commands operating on the virtual file system as well as commands
running on the host. 4.4 A Simple Test Session Only the additional elements compared to the
given source code are described below. Add these appropriately to the test script. Our path name
syntax is the same as Unix path names. Obviously, not every arbitrary string is a valid path or
name. Also, the dot and the dot-dot are not permissible as arguments in some contexts below.
Nevertheless these commands must be robust. fs33% ls > test lists the contents of the current
directory of our own file system and redirects the output into the file test of the local directory of
the host's file system. fs33% ls | !cat pipes the output of ls into the local command cat. fs33%
!cat test shows the contents of the file test of the host's file system (which should contain the
output of ls if previously executed as above). fs33% !sleep 15 & waits 15 seconds (since it is
executed in the background the command prompt should be available immediately, though). 5.
Turn In
