UNIX Help - Overclock.net

c_loke · 10-04-05

Hey, im stuck for two UNIX questions on my assignment. Can you guys give me a hand?

Question 1:
Gene has a large directory structure of .essay files,
where he has saved all of the essays that he has done over his
academic career. Not all of the .essay files are in the same
directory (he organized them and put them in subdirectories).
He wants to find out which 10 essays he has written have the most words.
What one line command would he have to run to find out?

Question 2:
Judy has a directory in her home direictory that she wants to share
with her friend Jill. Judy's username is nitro (hence her home
directory is /home/nitro), and the directory she wants to share is SharedStuff.
What command(s) will Judy have to run so that Jill can get access
to read the contents of the SharedStuff directory (but no other
directory)?

kopeah · 10-04-05

Quote:

Originally Posted by c_loke

Question 1:
Gene has a large directory structure of .essay files,
where he has saved all of the essays that he has done over his
academic career. Not all of the .essay files are in the same
directory (he organized them and put them in subdirectories).
He wants to find out which 10 essays he has written have the most words.
What one line command would he have to run to find out?

File with most words, basically the first 10 largest file.

Code:

ls -lS *

Quote:

Originally Posted by c_loke

Question 2:
Judy has a directory in her home direictory that she wants to share
with her friend Jill. Judy's username is nitro (hence her home
directory is /home/nitro), and the directory she wants to share is SharedStuff.
What command(s) will Judy have to run so that Jill can get access
to read the contents of the SharedStuff directory (but no other
directory)?

If Judy and Jill belong to the same group,

Code:

chmod g+r SharedStuff

if not

Code:

chmod o+r SharedStuff

But then, this also depends on how the system has been configured. If /home/nitro is configured with only user have read,write,and execute then Jill is SoL.

c_loke · 10-04-05

ok my teacher is a fool. he just updated the information to include this to the first question.

does it change my answer?

(note: * is a wildcard that represents every file
(so *.java would represent every file that ends in .java))
NOTE: The files being examined are those with file names like
knuth.essay, ruskey.essay, world.essay, etc. You may
assume that there are no subdirectories of subdirectories
and that you are currently in the top-level directory that
contains any .essay files. The unix command "wc" should
prove useful.

kopeah · 10-05-05

Quote:

Originally Posted by c_loke

ok my teacher is a fool. he just updated the information to include this to the first question.

does it change my answer?

(note: * is a wildcard that represents every file
(so *.java would represent every file that ends in .java))
NOTE: The files being examined are those with file names like
knuth.essay, ruskey.essay, world.essay, etc. You may
assume that there are no subdirectories of subdirectories
and that you are currently in the top-level directory that
contains any .essay files. The unix command "wc" should
prove useful.

Oops ..the first answer would be

Code:

ls -lS *.essay

c_loke · 10-05-05

thanks man.
*rep 4 u

*Xaimus* · 10-10-05

first:
find . -iname "*.essay" -print0 | xargs -0 wc -w | sort -r | tail -n +2 | head -n 10
This will find all files in all subdirectories that end with .essay, pipe the output to wc -w, sort the results in descending order, cut out the first line of cruft (the total count), and only display 10 results.
find . -iname "*.essay" -print0 | xargs -0 wc -w | sort -r
would work just as well, if wc reports results in a different format.

Examples of execution:

Code:

imran@pandora:~/Programming/CIS300$ find . -iname "*.java" -print0 | xargs -0 wc -w | sort -r | tail -n +2 | head -n 10
     544 ./Project 2/xaimus/ArrayList.java
     528 ./Project 2/xaimus/LinkedList.java
     422 ./Project 2/xaimus/Test.java
     408 ./Project 1/xaimus/ArrayList.java
     330 ./Project 2/xaimus/Main.java
     256 ./Project 2/xaimus/ConsoleIO.java
     256 ./Project 1/xaimus/ConsoleIO.java
     233 ./Project 1/xaimus/Main.java
     232 ./Project 2/xaimus/GraphicIO.java
     232 ./Project 1/xaimus/GraphicIO.java

Code:

imran@pandora:~/Programming/CIS300$ find . -iname "*.java" -print0 | xargs -0 wc -w | sort -r
    4045 total
     544 ./Project 2/xaimus/ArrayList.java
     528 ./Project 2/xaimus/LinkedList.java
     422 ./Project 2/xaimus/Test.java
     408 ./Project 1/xaimus/ArrayList.java
     330 ./Project 2/xaimus/Main.java
     256 ./Project 2/xaimus/ConsoleIO.java
     256 ./Project 1/xaimus/ConsoleIO.java
     233 ./Project 1/xaimus/Main.java
     232 ./Project 2/xaimus/GraphicIO.java
     232 ./Project 1/xaimus/GraphicIO.java
     204 ./Project 2/xaimus/List.java
     138 ./Project 1/xaimus/List.java
     131 ./Project 2/xaimus/IO.java
     131 ./Project 1/xaimus/IO.java

second:
Judy could use setfacl to allow Judy and only Judy access to her homedir, or she could enable the world-readable/executable and group-readable/executable bits in her homedir. Additionally, she would need to set the world-executable and group-executable bits in all parent directories:
chmod 711 ~
chmod 755 ~/SharedStuff

edit: typos
edit again: holy **** i'm over a week late

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