prash

prash stands for 'Pratyay's Shell' and is a bash-like UNIX shell written in C.

How To Use

Compilation + Execution: Run the following command in the shell directory

make run

Compilation Only : Run the following command in the shell directory

make

To run from any directory

<path_to_shel_dir/prash>

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Custom Functions

1. echo
2. ls
3. cd
4. pwd
5. pinfo
6. repeat
7. fg
8. bg
9. sig
10. jobs
11. Ctrl + D logs the user out of prash.
12. Ctrl + C interrupts current foreground job
13. Ctrl + Z pushed foreground job to background and changes state to 'stopped'.
14. Piping and redirection support.

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Assumptions

• Path length does not exceed 4096 characters
• Command length does not exceed 8192 characters
• As clarified, only valid input involving pipes and redirection will be given (no two '>' in a single command, input and output redirection at only the first and last pipes respectively, etc.)

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Files

1. bgproc.c , .h : To deal with background processes
2. cd.c, .h : To implement the cd command
3. ls.c, .h : To implement the ls command
4. pinfo.c, .h : To implement the pinfo command
5. commands.c, .h : To parse each individual command, and invoke appropriate custom/system commands.
6. pwdecho.c, .h : To implement the pwd and echo commands
7. shell.c, .h : To print the prompt, and get the user's input. Also handles the repeat command.
8. globalheader.h : Has all the necessary system header file inclusion statements, and also declares some global variables using the extern keyword, also has the MAXPATH,MAXCMD macros.
9. pipes.h : Handles redirection and piping, acts as an intermediate layer between the shell and command handler.

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