MichaelUy / rshell

Michael Uy's repo for CS100 @ https://github.com/mikeizbicki/ucr-cs100/tree/2015winter/assignments/hw/hw0-rshell

#Summary rshell is a simple shell that is able to run basic syscalls utilizing: #HW3 Summary For HW3 I implemented my own version of cd, custom SIGNAL ^C,and used the execv syscall instead of the execvp syscall which required getenv() to get the PATH variable. -supports:

• cd to a directory with a relative path
• cd to a directory with an absolute path
• cd to previous (..) directory
• Special Case: cd without a directoy notifies the user there there is noe directory specified
• ^c signal is ignored in rshell when nothing is running
• ^c signal kills the child when an executable is running, such as cat
• my rshell supports commands that are located in diffrent directories by using getenv() and attempting to find the commands in multiple directories
• if the command does not exist, my rshell throws an error notifying the user that the command does not exists

#known bugs and limitations

• did not implement ^z
• STILL DOES NOT HAVE PIPING, PIPING HURTS,OH GOD
• connectors usually don't work
• io redirection does not work for ls and cd

#HW2 Summary For HW2 I implemented my own I/O Redirection symbols which requires the manipulation of file descriptors

• supports:
• executable<file #(existentfile or not)
• executable>file #(existentfile or not)
• executalbe>>file #(existentfile or not; if existent it will append)
• wctext2 #this passes text into word count and reaps the output into text2
• wc>text2 #this passes text into word count and reaps the output and appends it to text2
• CONNECTORS ARE NOT FUNCTIONING I TRIED I DID BUT MY BEST WAS NOT IN THE LEAST SUFFICENT
• PIPING DOES NOT WORK, I DEVOTED HALF MY CODE TO THEM, BUT ALAS THE SLINGS AND ARROWS OF FATE

HW1 Summary

For HW1 I implemented my own ls command. It is as close to GNU ls as possible (plus magenta "hidden" colorizing):

• supports: -a,-l,-R, and any combination of the three (i.e. -al, -lR, -Rla, and ect.)
• can take in 0,1,+1 path arguments
• uses perror on: opendir,closeddir,readdir stat

HW1 EXTRA CREDIT & FEATURES

EXTRA CREDIT: uses ANSI escape codes to display diffrent types of files in color -Supports:

• directories: blue text, BOLD

• links: cyan text, BOLD

• pipe: yellow text, black background

• socket: magenta text, BOLD

• block devices: yellow text, black background, BOLD

• character device: yellow text, black background, BOLD

• executables: green text

• HIDDEN FILES: I chose to give a magenta background (instead of grey) to hidden files for readability I chose to follow the Gnu ls color coding standards

• On invalid flag call, I report the flag that threw the error

• return "ls: cannot run invalid flag ''"

HW1 TEST CASES

• ./ -R
• ../ -R
• -a
• -l
• -R
• -z
• -R -R
• -R-R
• -laR
• ///////

---

• src
• src -a
• src -l
• src -R
• src -Rla
• src -l
• src/ -R
• src src
• src src -l
• src src -a
• -a src src
• -l src src
• -R src src
• -la src src
• -lR src SRC
• . src src ..
• ...
• -lll
• fakefile
• . . . . . . . . . . . . . . . . . . .
• ~
• \

HW1 KNOWN BUGS

• if memory takes more that 6 digit spaces, -l output becomes mis aligned
• non -a outputs are not alligned into columns
• .//
• \
• ////////

HW0 Summary

For HW0 I created rshell. rshell is a simple shell that is able to run basic syscalls utilizing

• ls and its flags, cheifly -a,-A,-l,-R,-s,-S and the sort
• echo followed by text or no text -combinational operators ';','&&','||'
• ignores white space, though flags that are touching commands are errors as per usual
• supports both "exit" and "Exit" commands

#Test Cases

ls tests

1. ls
2. ls -a
3. ls -aRl
4. ls -a-R-l
5. ls -a -OneFlagThatExistsAndAnotherThatDoesnt
6. & ls
7. ls &
8. ls &&
9. && ls
10. ls ls ls ls ls

combinational operators tests

1. ls||echo
2. ls || echo
3. ls && echo
4. ls||&&echo
5. ls|&|&|&|&echo
6. ls;echo;echo
7. ls;;echo
8. ||
9. ;
10. ;&&||

comments and command variations tests

1. #hi
2. echo # hi

4. hi

5. ls # -a
6. ls -l ; # test
7. cd #
8. #echo && echo || echo test
9. ls|| # test
10. echo tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt#tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt

true and false example tests

1. true || echo
2. false || ls
3. true; false||ls
4. false && echo
5. true && echo
6. false; ls
7. ls -a false
8. ls true && echo
9. true && false || echo wow
10. false || true && wow

miscellaneous destruction attemps

1. ls -aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
2. false || false || false || false || false || false || false || false || ls -l
3. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;&& ls
4. false |||||| echo
5. cat nonexistantfile.cpp
6. cat echo
7. echo cat
8. ls cat ls echo ls cat
9. ls -X-x-U-V
10. echo 123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789vvvvv123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789123456789

#Known Bug

• Buffer only holds up to 32000 characters
• getting a "is not a file and directory" error on ls brings that error to other ls's
• "#" commenting doesn't work when put in a field of other characters (ex. "ttttttttttttttttttt#tttttttttttttttttt")
• ls -a-R-l throws an syntatcicall error on '-'
• cat has a simillar issue as ls when it comes to not finding and file or directory
• ls sees combinational operators as arguments on occasion
• more bugs exist that have missed my eye