https://drive.google.com/file/d/19s1QCUotJxLb93VCmH1lbYTs7qu0oQQo/view?usp=sharing

This repository contains a C program named minibash which acts as a simple shell that goes into an infinite loop waiting for user's commands. Once a command is entered, the program assembles and executes each command using fork(), exec(), and other system calls as required.

• Execute Commands: Execute commands entered by the user using fork() and exec().
• Special Characters: Handle special characters like #, ~, +, |, <, >, >>, ;, &&, and ||.
• Process Management: Run processes in the background and bring them to the foreground.
• File Operations: Perform file operations like word count, file concatenation, and redirection.

• minibash$dter: Kills the current minibash terminal.
• #: Counts the number of words present in a specified .txt file.
  • Example: minibash$ # sample.txt outputs the number of words in sample.txt.
• ~: Concatenates specified .txt files.
  • Example: minibash$ sample1.txt ~ sample2.txt ~ temp1.txt ~ temp2.txt concatenates the files in order.
• +: Runs a process in the background.
  • Example: minibash$ ex10 30 20 a + runs ex10 30 20 a in the background.
  • minibash$ fore brings the last background process to the foreground.
• |: Piping operations (up to 4 pipes supported).
  • Example: minibash$ ls -l -t -a | grep *.txt | wc | wc -w.
• <, >, >>: Input and output redirection.
  • Example: minibash$ grep to < sample.txt for input redirection.
  • Example: minibash$ ls -1 > dirlist.txt for output redirection.
  • Example: minibash$ ls -1 >> dirlist.txt for output redirection with append.
• ;: Sequential execution of commands (up to 4 commands).
  • Example: minibash$ date ; pwd ; ls -l -t -a.
• &&, ||: Conditional execution (up to 4 operators supported, combination of && and || possible).
  • Example: minibash$ ex1 && ex2 && ex3 && ex4.
  • Example: minibash$ c1 && c2 || c3 && c4.

• Kill minibash terminal: $ minibash$dter
• Word count in a file: $ minibash$ # sample.txt
• Concatenate files: $ minibash$ sample1.txt ~ sample2.txt
• Run a process in the background: $ minibash$ ex10 30 20 a +
• Piping commands: $ minibash$ ls -l -t -a | grep *.txt | wc | wc -w
• Input redirection: $ minibash$ grep to < sample.txt
• Output redirection: $ minibash$ ls -1 > dirlist.txt
• Sequential execution: $ minibash$ date ; pwd ; ls -l -t -a
• Conditional execution: $ minibash$ ex1 && ex2 && ex3 && ex4

• Avoid creating a "fork bomb". Use $killall -u username periodically.

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