The goal $of$ this project $isto$ practice $on$ basic library functions for reading directories

$in$ Linux. You will implement a program that lists all the files $in$ a given directory.

You can start from scratch $or$ use the $myls$ version $3$ attached.

$1.$ Your program should take two possible command line arguments. For example

$\frac{.}{m}yls-a\frac{\text{~}}{D}$ocument$$

$2.$ The first argument $isan$ option started with a dash $-.$ Legitimate options are $-a$

and $-l.$

$3.If-ais$ giving, you need $to$ list all files including hidden file start with $..$

$4.If-lis$ giving, you need $to$ list one file per line with detailed information $(file$ type,

permission, link number, user, group, size, modification time, and file name$).$ The

format should $be$ the same $as$ the real $ls-l.$

$5.Ifno$ dash option $is$ given, you only list file names with hidden file excluded.

$6.$ The second argument $is$ a path $(relativeorabsolute)to$ a directory. $If$ present, list

the files $in$ the specified directory. $Ifno$ second argument $is$ given, list the files $in$

current directory.

$7.$ Your project submission should include the implementation files $myls.c,$ header file

$(optional),$ Makefile $(optional),$ and a README file.

$8.$ All the file names need $tobe$ listed $in$ ascending order. You can compare the outputs

with real $ls.$

$II.$ Important:

$1.$ You will need $todo$ your own research $on$ how $to$ use masking, getpwuid$(),$

getgrgid$(),$ ctime$()to$ decode the file type, permission, user name, group name,

modification time $in$ the $stat$ structure.

$2.$ You can write your own sorting function $or$ research $on$ how $to$ use qsort$().$

III. Grading Criteria:

$$ Please make sure your program compiles, otherwise your submission will not $be$

graded, and you will receive zero.

$$ Point deduction rule:

$$ Compile warning: $3$ points each.

$$ Minor error: such $as$ not meeting the assignment inpu$\frac{t}{o}$utput requirement, $5$

points each.

$$ Major error: examples include, infinite loop, runtime errors, any segmentation fault,

$15$ points each.

$$ Default list function $(no$ argument$)$: $10\%.$

$$ List the files $in$ the specified directory: $10\%.$

$-$a option: $10\%$

$-l$ option: $30\%$

$$ Ascending order sorting: $30\%.$

$$ README: $10\%.$

$$ Extra credits: $-al$ option $(list$ details for all files including hidden files, check $ls-al$ for

reference$)20\%$

$IV.$ Submission:

$1.$ Each student submits one copy $of$ the source code.

$2.$ Create a folder and name $it[first$ name${]}_{\text{l}\text{a}\text{s}\text{t}\text{n}\text{a}\text{m}\text{e}}{?}_{h}7($$ mkdir $zhen{g}_x{i}_{h}7)$

$3.$ Copy all your source code $to$ the above folder $(source$ code only, $no$ binary files!$).$

$4.$ Edit a README.$txt$ file $(in$ text format only, $do$ not use Microsoft Word, use notepad

$in$ Windows $or$ use $vior$ nano $in$ Linux$)$ and provide the following information:

$$ Project description

$$ Compiling instruction $if$ any

$$ A sample test run $if$ any

$$ Existing bugs $(things$ not finished$)$

$5.scp$ the folder $(e.g.,zhen{g}_x{i}_{h}7)to$ your account $in$ grail.

$6.sshlogin$ grail, $goto$ the parent directory $of$ the folder you created, and run

$(suppose$ that your folder $is"zhen{g}_x{i}_{h}7")$

turnin$22h7$@cis$340jzhen{g}_x{i}_{h}7$

You should see a list $of$ files followed $by$ a message like the following:

You are about $to$ turnin $X$ files for $[XKB]$ for $h7to$ cis$340j$

$***Do$ you want $to$ continue?

Answer $yor$ yes $to$ submit $or$ answer $nornoif$ you $do$ not want $to$ submit.

You should now see $as$ list $of$ the files being submitted, followed $by$:

$***$ TURNIN $ofh7to$ cis$340j$ COMPLETE! $***$

$7.$ You can submit more than one time. Your most recent submission will always

automatically overwrite the previous one.