hjabbouri / pipex

the same behavior of the unix pipe in shell commands

PIPEX

Your program will be executed as follows:

./pipex file1 cmd1 cmd2 file2

It must take 4 arguments:

• file1 and file2 are file names.
• cmd1 and cmd2 are shell commands with their parameters. It must behave exactly the same as the shell command below:

$> < file1 cmd1 | cmd2 > file2

Examples

$> ./pipex infile "ls -l" "wc -l" outfile

Should behave like: < infile ls -l | wc -l > outfile

$> ./pipex infile "grep a1" "wc -w" outfile

Should behave like: < infile grep a1 | wc -w > outfile

Requirements

Your project must comply with the following rules:

• You have to turn in a Makefile which will compile your source files. It must not relink.
• You have to handle errors thoroughly. In no way your program should quit unexpectedly (segmentation fault, bus error, double free, and so forth).
• Your program mustn’t have memory leaks.
• If you have any doubt, handle the errors like the shell command: < file1 cmd1 | cmd2 > file2

Bonus part

You will get extra points if you:

• Handle multiple pipes.

  This: $> ./pipex file1 cmd1 cmd2 cmd3 ... cmdn file2

  Should behave like: < file1 cmd1 | cmd2 | cmd3 ... | cmdn > file2

• Support « and » when the first parameter is "here_doc".

  This: $> ./pipex here_doc LIMITER cmd cmd1 file Should behave like: cmd << LIMITER | cmd1 >> file