Question

You will write a simple program called reverse. This program should be invoked in one of the following ways: prompts/reverse prompts/reverse input.txt prompt/reverse input.txt output.txt The above line means the users typed in the name of the reversing program reverse (the ./ in front of it simply refers to the current working directory (called dot, referred to as .) and the slash (/) is a separator; thus, in this directory, look for a program named reverse) and gave it either no command-line arguments, one command-line argument (an input file, input.txt), or two command-line arguments (an input file and an output file output.txt). An input file might look like this: hello this is a file The goal of the reversing program is to read in the data from the specified input file and reverse it; thus, the lines should be printed out in the reverse order of the input stream. Thus, for the aforementioned example, the output should be: a file is this hello The different ways to invoke the file (as above) all correspond to slightly different ways of using this simple new Unix utility. For example, when invoked with two command-line arguments, the program should read from the input file the user supplies and write the reversed version of said file to the output file the user supplies.

          You will write a simple program called reverse. This program should be invoked in one
of the following ways:
prompts/reverse
prompts/reverse input.txt
prompt/reverse input.txt output.txt
The above line means the users typed in the name of the reversing
program reverse (the ./ in front of it simply refers to the current working directory
(called dot, referred to as .) and the slash (/) is a separator; thus, in this directory, look
for a program named reverse) and gave it either no command-line arguments, one
command-line argument (an input file, input.txt), or two command-line arguments (an
input file and an output file output.txt).
An input file might look like this:
hello
this
is
a file
The goal of the reversing program is to read in the data from the specified input file and
reverse it; thus, the lines should be printed out in the reverse order of the input stream.
Thus, for the aforementioned example, the output should be:
a file
is
this
hello
The different ways to invoke the file (as above) all correspond to slightly different ways
of using this simple new Unix utility. For example, when invoked with two command-line
arguments, the program should read from the input file the user supplies and write the
reversed version of said file to the output file the user supplies.

You will write a simple program called reverse. This program should be invoked in one
of the following ways:
prompts/reverse
prompts/reverse input.txt
prompt/reverse input.txt output.txt
The above line means the users typed in the name of the reversing
program reverse (the ./ in front of it simply refers to the current working directory
(called dot, referred to as .) and the slash (/) is a separator; thus, in this directory, look
for a program named reverse) and gave it either no command-line arguments, one
command-line argument (an input file, input.txt), or two command-line arguments (an
input file and an output file output.txt).
An input file might look like this:
hello
this
is
a file
The goal of the reversing program is to read in the data from the specified input file and
reverse it; thus, the lines should be printed out in the reverse order of the input stream.
Thus, for the aforementioned example, the output should be:
a file
is
this
hello
The different ways to invoke the file (as above) all correspond to slightly different ways
of using this simple new Unix utility. For example, when invoked with two command-line
arguments, the program should read from the input file the user supplies and write the
reversed version of said file to the output file the user supplies.

Added by Stephen C.

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