TTMSH

by Jacky Chen, Vincent Jiang, and Cullen Ye
TNPG: The Three Musketeers

Features:

• Shell prompt shows your current directory.
• Forks and executes commands.
  • Specifically accounts for "exit", cd, redirection, and piping.
• Parses multiple commands on one line, using ";".
• Redirection with >, <, >>.
• Piping with |.

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Attempted:

• Tried to allow two redirections in the same command, as in: "tr a-z A-Z < file > another_file"
  • Doesn't work if another_file is already created.

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Bugs:

• Limited to 100 characters per line of command.

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Files & Function Headers:

main.c

• Runs the shell.
• Displays current directory in the prompt.
• Allows the user to type into stdin.
• Reads in commands & sends them off to be interpreted.

shell.c

• Interprets all the different commands and directly runs them.

/*======== char ** parse_commands() ==========
Inputs:  char *line, char *delimiter
Returns: Array of commands, separated by delimeter.

Uses strtok to separate the individual commands in a single line input.
====================*/

/*======== void runcmd() ==========
Inputs:  char *command
Returns: N/A

This actually interprets the given command. Forks and execvp's the command. This function specially accounts for "exit", redirection, piping, and cd.
====================*/

/*======== void copy_str() ==========
Inputs:  char *target, char *source
Returns: N/A

Copies string from source to target.
====================*/

/*======== void redirect() ==========
Inputs:  char *command
Returns: N/A

Directly handles redirection.
====================*/

 /*======== void redirect2() ==========
Inputs:  char *command
Returns: N/A

Just a helper function for redirect().
====================*/

shell.h

• Header file for shell.c.