PIPEX

PIPEX

The aim of this project is to mimic the UNIX mechanism.

⭐ Key concepts

Redirection, Pipes, Process, fork(), dup2()

⭐ Developer notes

🔗리디렉션과 파이프
🔗리눅스 명령 탐색 경로
🔗프로세스 생성과 실행
🔗파일 디스크립터

🚀 Contents

🚩 Mandatory Part

• The executable file must be named pipex.
• Handle the errors like the shell command < file1 cmd1 | cmd2 > file2.
• You are allowed to use the following functions:

◦ access

◦ open

◦ unlink

◦ close

◦ read

◦ write

◦ malloc

◦ waitpid

◦ wait

◦ free

◦ pipe

◦ dup

◦ dup2

◦ execve

◦ fork

◦ perror

◦ strerror

◦ exit

• The program should be executed in this way

   ./pipex file1 cmd1 cmd2 file2
  

• Just in case: file1 and file2 are file names, cmd1 and cmd2 are shell commands with their parameters.

• The execution of the pipex program should do the same as the next shell command:

  < file1 cmd1 | cmd2 > file2
  

• Examples

   ./pipex infile ``ls -l'' ``wc -l'' outfile
   < infile ls -l | wc -l > outfile
   
   ./pipex infile ``grep a1'' ``wc -w'' outfile
   < infile grep a1 | wc -w > outfile
  

🚩 Bonus Part

• Handle multiple pipes

   ./pipex file1 cmd1 cmd2 cmd3 ... cmdn file2
   < file1 cmd1 | cmd2 | cmd3 ... | cmdn > file2
  

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

   ./pipex here_doc LIMITER cmd cmd1 file
   cmd << LIMITER | cmd1 >> file