89 lines
3.2 KiB
Markdown
89 lines
3.2 KiB
Markdown
If you use more than 3 lines of code from the internet, cite them in a comment.
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It's cause for an 'f' otherwise!!!!
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THIS IS OUT OF 20 POINTS!!!! No one can get more than 20 points.
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If you work in pairs, then I'll give each person 2/3 of the total points. So
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if a team gets 30 (and each person gets 15), I'll give each student 20.
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If you work in threes, then I'll give each person 1/2 of the total points. So
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if a team gets 40 (and each person gets 13.3333), I'll give each student 20.
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The Shell Assignment (total 42 points)
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+ 1 ~~Can run an executable~~
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+ `/bin/ls`
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+ 1 ~~You search the path for the executable~~
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+ `ls`
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+ 1 ~~Can do file input redirection "<"~~
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+ `ls > fred`
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+ 1 ~~Can do file output redirection ">"~~
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+ `ls < fred`
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+ 2 ~~Can do command piping "|"~~
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+ `ls | wc`
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+ 1 ~~Can do lots of pipes~~
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+ `ls | grep fred | wc`
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+ 1 ~~Can do at least one combination of these things~~
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+ `ls | wc > fred`
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+ 4 ~~Can do any combination of three of <, >, and |~~
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+ `cat < filename | sort > sortedFile.txt`
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+ 2 Can set enviornment variables
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+ `PATH=:/bin:/sbin:/usr/sbin:/usr/bin`
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+ 2 ~~Expands enviornment variables on the command line~~
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+ `ls $HOME`
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+ 2 ~~Does filename expansion "glob" (Hint: Use the built in glob.)~~
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+ `ls a*b`
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+ 1 ~~Knows how to change directory~~
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+ `cd /fred`
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+ 1 Bang last command
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+ `!l` runs ls
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+ 1 Bang # command
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+ `!4` runs 4th command from history
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+ 1 ~~Queue commands~~
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+ `make ; make install`
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+ 1 ~~Can have lots of semicolons~~
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+ `ls; sleep 3; rm fred`
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+ 2 Change Prompt
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+ `PS1="what is you command?"`
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+ 3 Can run commands in the background.
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+ `processImage &`
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+ 1 Concatenate commands with &. Only runs next command if the previous
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comand returned success.
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+ `cd /home/rappleto & rm fred.txt`
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+ 1 ~~Catch Keyboard interrupt~~
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+ `ctrl + c` = back to prompt
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+ 1 ~~Replace "~" with the home directory~~
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+ `rm ~/junkfile`
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+ 1 ~~Control-L clears the screen~~
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+ `ctrl-l` = clear screen
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+ 3 When they misspell a command, offer a suggestion
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+ (user) `lss`
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+ (shell) Did you mean `ls`?
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+ 2 Can run commands from a file
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+ `. scriptFile.txt`
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+ 2 ~~Tab Completion~~ and ~~Arrow History~~
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+ 1 ~~Saves and reloads history to a file~~
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+ 2 Automatically runs a file called .myshell when it starts
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+ 2 Only runs execuatables from an approved list
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+ -2 Commands cannot have arguments (i.e. ls -l does not work).
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25 pts
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/20
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Some cases to consider
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+ A person tries to run a non-executable.
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+ A person tries to read or write to a non-existent file.
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+ A person tries to read or write to a file they do not have permissions on.
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+ A person tries a non-sensical command. (i.e. `ls > foo > fee < doo < dee`)
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+ A person tries to pipe to a non-command (i.e. `ls | /tmp/foo.txt`)
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+ A person tries to pipe from a non-command (i.e. `/tmp/foo | ls`)
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+ A person tries to expand a non-variable (i.e. `ls $DOES_NOT_EXIST`)
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+ A regular expression matches no files.
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+ A regular expression matches one file.
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+ A regular expression matches lots of files.
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+ A person tries to change directory to something that does not exist.
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These programs are due Friday before finals week. It will take a totally excellent excuse to move this at all.
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