itseugen / pipex

This project is about handling pipes.

pipex

This project is about handeling pipes!

Coded in

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The project:

Basics:

• The program has to behave like this shell command:

< infile cmd1 | cmd2 > outfile

• The program gets executed the following way:

./pipex "infile" "cmd1" "cmd2" "outfile"

• The program only works for UNIX-like operating systems.

Functioning:

• The program pipes the contents of the "infile" into the first command "cmd1".
• The first command gets executed, the results get piped into the second command "cmd2".
• The second command gets executed and the output is written to "outfile". All existing contents of the "outfile" are overwritten (If the program has no output, "outfile" will be empty").
• The "outfile" will get overwritten!

Other functionality:

• In addition to the basic functioning of the project, you can insert as many commands as you want into the project:

./pipex "infile" "cmd1" "cmd2" "..." "cmdn" "outfile"

Here_doc:

• The program can also simulate the following shell command:

cmd << LIMITER | cmd1 >> outfile

• For this the program has to be executed the following way:

./pipex here_doc "LIMITER" "cmd" "cmd1" "outfile"

• If the program is called with here_doc as first parameter, the User can input text into the command line, once a line is the same as specified, the program stops reading and executes the commands.
• In addition, with here_doc, the "outfile" will not be overwritten, but the results will be appended to it.

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Installation and Usage

1. Clone the repository:

git clone https://github.com/itseugen/pipex

2. Enter the directory and build the program:

cd pipex
make

Optional: Clean object files:

make clean

3. Create a input file (the program needs an existing input file, if the output file is missing it will be created):

touch input.txt

4. Run the program like explained above, you need at least for arguments. Example:

./pipex "input.txt" "grep Hello" "wc -w" "output.txt"

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_{^{This project is part of my studies at 42 Heilbronn}}