CS3423 -Assignment 3 - awk - Systems Programming - Solved

For this assignment you will use awk to create a program for summarizing and printing information based on the directory listing data of files and information.

You are not to use any other programs, utilities, or scripting languages not covered in class, unless otherwise specifically and explicitly stated in this document.

Your program should take the output from the modified ls command line seen below, and process the data in order to output the aggregate information:

ls -la --time-style='+%Y-%m-%d %H:%M:%S'

In fact, to avoid human error and ensure you are always using the correct command line, I suggest creating and adding a new alias to your bash resource configuration file:

alias lsa="\ls -la --time-style='+%Y-%m-%d %H:%M:%S'"

Note that the inclusion of the leading backslash ensures no other previously-defined/existing ls aliases are used; certain other options such as -h could cause your script to fail, for example.

Aggregated information requirements

The aggregated information processed from the directory listing data should consist of the following (see example later for proper output formatting):

•      Per-user grouping of file-related counts found in specified directories

–    Username of the entity owning these files

–    Total number of files found owned by this user, printing two values: all files versus hidden files

–    Total number of directories found that are owned by this user

–    Total number of “other” files found that are owned by this user

(these items include, but are not limited to, symbolic links, FIFO’s, character or block devices, etc. Basically, anything that is not a regular file nor a directory will fall under this category)

–    Total file storage (in bytes) occupied by the user’s regular files.

•      Itemization of the oldest and newest regular files found (if no regular files exist in the listing, simply report "None" for these items. If only one regular file exists, it is reasonable to report this file as both the oldest and newest.)

Also note, if multiple files share the same oldest or newest timestamps, you can break the tie however you wish; there are no guidelines you must adhere to while doing so.

•      Total file-related counts found in the specified directories

–    Total users owning files within these paths

–    Total number of files found, printing two values: all files versus hidden files

–    Total number of directories found

–    Total number of “other” files found

(these items include, but are not limited to, symbolic links, FIFO’s, character or block devices, etc. Basically, anything that is not a regular file nor a directory will fall under this category)

–    Total file storage (in bytes) occupied by all regular files listed.

Note: again, do not use sed , Python, or any other languages or utilities not explicitly allowed by this assignment.

Note 2: ensure to test the processing of ls listings for multiple directories, rather than just one. Such listings can be generated by passing more than one directory to ls and/or by the simple addition of the -r recursive option to the custom ls command shown previously. Two examples of such command lines can be seen here:

ls -la --time-style='+%Y-%m-%d %H:%M:%S' dir1 dir2 dir3 ls -lar --time-style='+%Y-%m-%d %H:%M:%S' dir1

or if you have defined the aforementioned alias, equivalently: lsa dir1 dir2 dir3 file1 dir4 lsa -r dir1 file1 dir2

Note that these commands can also include filenames alongside the directory names on the command line as well; this is perfectly permissible and should be accounted for, hence why it was shown in the example above.

Example

The example below is an excerpt from the following command, executed upon my home directory:

ls -la –time-style='+%Y-%m-%d %H:%M:%S' ~

Input

ssilvestro@fox05:~/courses/cs/3423/Spring20/assign3$ head -n 30 data/input.txt total 17160 drwxrwxrwt 98 root          root         528384 2020-04-07 13:38:14 . drwxr-xr-x 26 root    root         4096 2018-09-04 10:50:29 ..

drwx------ 2 pmp099 students     4096 2020-03-03 20:57:31 appInsights-nodeAIF-444c3af9←↪ -8e69-4462-ab49-4191e6ad1916

 

-rw-------
1 mce237 students
199 2020-03-01 18:41:59 .build1276786824731864129.log
-rw-------
1 mce237 students
199 2020-03-01 20:18:42 .build291177188595028335.log
-rw-------
1 mce237 students
199 2020-03-01 20:10:44 .build4195866878600813549.log
-rw-------
1 mce237 students
199 2020-03-01 20:08:55 .build4503681510908034369.log
-rw-------
1 mce237 students
199 2020-03-01 18:18:44 .build4964061885086964943.log
-rw-------
1 mce237 students
199 2020-03-01 20:17:13 .build5474334865226720725.log
-rw-------
1 mce237 students
199 2020-03-01 19:08:39 .build6322670020019345604.log
-rw-------
1 mce237 students
420 2020-03-01 20:08:08 .build8057453026527719771.log
-rw-------
1 mce237 students
199 2020-03-01 20:08:32 .build8316126450060215695.log
-rw-------
1 mce237 students
732 2020-03-01 20:13:35 .build8317708361921336382.log
-rw-------
1 mce237 students
420 2020-03-01 20:07:57 .build8983757940366444429.log
drwxr-xr-x
3 bfn715 students
4096 2020-03-03 23:07:12
dlight_bfn715
drwx------
3 dad980 students
4096 2020-03-05 15:44:15
dlight_dad980
drwx------
3 hrb980 students
4096 2020-04-06 09:54:44
dlight_hrb980
drwx------
3 hrm102 students
4096 2020-04-06 18:43:17
dlight_hrm102
drwx------
3 kaq447 students
4096 2020-02-26 17:58:46
dlight_kaq447
drwx------
3 mce237 students
4096 2020-03-30 00:04:57
dlight_mce237
drwx------
3 mjy610 students
4096 2020-02-27 15:33:54
dlight_mjy610
drwx------
3 pdq039 students
4096 2020-04-06 18:43:48
dlight_pdq039
drwx------
3 xie192 students
4096 2020-03-23 17:47:37
dlight_xie192
drwx------
3 ynb963 students
4096 2020-04-07 13:26:46
dlight_ynb963
-rw-------
1 hrb980 students
95 2020-03-09 16:25:53
exec1108000877022604592.log
-rw-------
1 hrb980 students
74 2020-04-03 13:39:09
exec1218509371493740144.log
-rw-------
1 hrb980 students
1470 2020-03-09 13:28:36
exec1334040267987479302.log
-rw-------
1 hrb980 students
1134 2020-04-06 10:16:23
exec1413924165655873346.log
-rw------...

...

Output
1 mce237 students
1538 2020-03-01 18:17:50
exec1520228248140431728.log
 
 
user: mjy610 dirs: 3

user: hrb980 files:
all/hidden:

dirs: 3
( 195
/
2
)
 
file storage:

user: pdq039 dirs: 3

user: zqu051 files:
76235
B
 
 
 
all/hidden:
( 452
/
0
)
 
file storage:

user: mce237 files:
652583
B
 
 
all/hidden:

dirs: 4
( 52 /
12
)
 
file storage:
2729344 B
 
 
user: dad980 files:

all/hidden: ( 4 / 1 )

dirs: 3 file storage: 6614 B

user: pmp099 dirs: 2

other: 10
user: ynb963 files:
all/hidden: ( 2 / 0 )
dirs: 3

file storage: 4202 B

user: xie192 dirs: 3

user: kaq447 files:

all/hidden: ( 2 / 0 )

dirs: 3 file storage: 3092 B

user: bfn715 dirs: 3

user: root files:

all/hidden: ( 1 / 1 )

dirs: 5 other: 1 file storage: 11 B

user: hrm102 dirs: 3

oldest file:

                         -r--r--r-- 1 root                        root                                                        11 2020-02-25 15:30:11 .←↪

X0-lock newest file:

-rw------- 1 ynb963 students            1308 2020-04-06 19:40:46 ←↪ output1586220046526

total users:                           13

total files all/hidden: ( 708 / 16 )

total dirs:             38 total other:   11 file storage:                3472081 B

Extra Credit (15%)

A 15% bonus will be awarded for those whose script correctly and properly sorts the usernamegrouped portion of the output. Such sorted output for the above example can be seen here:

Extra Credit Output

user: bfn715 dirs: 3

user: dad980 files:

all/hidden: ( 4 / 1 )

dirs: 3 file storage: 6614 B

user: hrb980 files:

all/hidden: ( 195 / 2 )

dirs: 3 file storage: 76235 B

user: hrm102 dirs: 3

user: kaq447 files:

all/hidden: ( 2 / 0 )

dirs: 3 file storage: 3092 B

user: mce237 files:

all/hidden: ( 52 / 12 )

dirs: 4

file storage: 2729344 B

user: mjy610 dirs: 3

user: pdq039 dirs: 3

user: pmp099 dirs: 2 other: 10

user: root files:

all/hidden: ( 1 / 1 )

dirs: 5 other: 1 file storage: 11 B

user: xie192 dirs: 3

user: ynb963 files:

all/hidden: ( 2 / 0 )

dirs: 3

file storage: 4202 B

user: zqu051 files:

all/hidden: ( 452 / 0 )

file storage: 652583 B

oldest file:

                         -r--r--r-- 1 root                        root                                                        11 2020-02-25 15:30:11 .←↪

X0-lock newest file:

-rw------- 1 ynb963 students            1308 2020-04-06 19:40:46 ←↪ output1586220046526

total users:                           13

total files all/hidden: ( 708 / 16 )

total dirs:             38 total other:   11 file storage:                3472081 B Hint: research awk’s asort function for help.

Script Execution

Your program should each be invoked through a single bash file (see below) with input taken from stdin. The resulting output should be printed directly to stdout.


Script Files

Your submission should consist of exactly two files:

•      assign3.sh - a bash script used as the driver program for your awk script

•      assign3.awk - the awk program used in assign3.sh

Verifying Your Program

In addition to the above Assignment Data, your program should also work with arbitrary input from the ls -la –time-style='+%Y-%m-%d %H:%M:%S' command defined on page 1. This include both reading from one or more input files, as well as accepted piped input directly from standard input, as in these examples:

ls -la --time-style='+%Y-%m-%d %H:%M:%S' ~ | ./assign3.sh

– or – ./assign3.sh listing.txt [listing2.txt [...]]