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Full Discussion: Bash script for printing folder names and their sizes
Homework and Emergencies Homework & Coursework Questions Bash script for printing folder names and their sizes Post 302867983 by UncleIS on Friday 25th of October 2013 01:00:23 PM
Old 10-25-2013
Bash script for printing folder names and their sizes
1. The problem statement, all variables and given/known data:

The task is to create a script that would reproduce the output of 'du' command, but in a different way: what 'du' does is:
Code:
<size> <folder name>

and what is needed is
Code:
<folder name> <size>

We need to show only 10 folders which are the biggest ones.

2. Relevant commands, code, scripts, algorithms:

Nothing special was stated here, so any solution that can still be called a bash script is good enough to be used.

3. The attempts at a solution (include all code and scripts):

I've tried several variants and finally came up with this:

Code:
du $1 2> /dev/null |\
    
    sort -nr -k1 |\

    head -10 |\

    cut -f2  |\

        while read fname

            do

                printf "${fname}\t`du -h --summarize \"$fname\" 2> /dev/null | cut -f1`\n"

            done

It does the job, but works too slowly to be used on practice: for my '/usr' folder it takes 7 minutes and 30 seconds to complete, while the 'du' with filters ('du /usr | sort -nr -k1 | head -10') does everything for 2 minutes and 30 seconds.

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Linux System Administration course, ITExpert educational centre, Minsk, Belarus.

Teacher: Viktor Kobzarev.

Thank you for your help!
 

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)
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