My Shell

Project: MyShell Due Date: 4/8/24 (11:59PM) authors: Arun Felix (ajf277), Kareem Jackson (kkj47)

This is a project that is our implementation of the bash shell with functioning built in functions (pwd, cd, which, exit) and the use of wildcards , pipes, redirects, and conditions.

What we did

implemented command line parsing, executing programs/files, handle redirects and piping. and partial execution of wildcard usage

after extracting, cd into P3 mysh is the only important file to recompile you can run "make" in P3

Interactive Interactive Mode

./mysh
Hello!
mysh>

Batch Mode

cat bash.sh | ./mysh
\[runs commands in bash.sh]
./mysh bash.sh
\[runs commands in bash.sh]

./sum < input.txt

in the P3 directory, input.txt contains 9 and 10, print 90 on the console.

./sum > output.txt

will take standard input from the user and store the result to the console.

./sum < input.txt > output.txt

will pass in 9 and 10 to sum and output 90 to the output.txt file.

ls -l | grep .c

will take the output of ls -l and pass it into grep with the arg .c

./sum arg1 arg2 arg3 | grep 81

assuming 9 and 9 are inputted, 81 will be outputted, piped to the into grep 81 and will print 81.

./sum < input.txt | grep 90 > output.txt

will redirect input.txt to sum, input contains 9 and 10, grep 90 will take the output of sum, and the output of grep will be redirected to output.txt

ls *.c

will list out all files containing .c files.

cat *.c

will print out the contents of all .c files in a directory.

echo hello
then echo success

will print success

ls santoehun taoheuc ado.rud
else failure

will print failure

neofetch

will run neofetch, searching the directory

cd ..

will go to the parent derictory

pwd

will print the current working directory.

which vim

will print the location of vim, /usr/bin/vim