minishell_on_c's Introduction

MiniShell

This program has been the final project for my Operating System course at university. It consists of programming a command interpreter (shell) for Linux. The shell should read lines from the standard input and execute commands. For reading from the standard input I've used stdio (fgets(3)).

It's input format for a command line will be:

command arg1 arg2 ...
In this program has also been implemented pipes, so you will be able to execute a pipeline:

cmd1 arg11... | cmd2 arg21 arg22... | cmd3 arg31... | ...
A command also could have an input/output redirection of both:

cmd1 args... < fin / cmd1 args... > fout / cmd1 args... < fin > fout
Implemented background:

cmd1 args | cmd2 args... | ... &
Implemented environment variables:

cmd=ls
arg=/tmp is equivalent to ls /tmp
$cmd $arg
Additional functions:
- For lines that aren't using input/output redirection or bg, if the line ends with "HERE{". In this case, the command will use as stdin the lines written by the user until the line is "}". Example: (wc -l will return 2, as there is 2 lines as input for cat command)
  
  cat | wc -l HERE{
  una y
  otra lin.
  }
- Command ifok/ifnot, will execute the command written after it, if the previous command exit status is SUCCESS/FAILURE. Example: (if directory /tmp exists, ls -l will be executed)
  
  test -e /tmp
  ifok ls -l /tmp
- Globbing

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