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Bash script for printing folder names and their sizes

 
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Homework and Emergencies Homework & Coursework Questions Bash script for printing folder names and their sizes
# 1  
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!
# 2  
Old 10-25-2013
Wath about the simpler:
Code:
du /usr/ | sort -nr | head -n11 | tail -n10 | while read size path; do echo $path $size;done

Emanuele

P.S. If you want consider also /usr dir (that obviously is the first result):
Code:
du /usr/ | sort -nr | head -n10 | while read size path; do echo $path $size;done

This User Gave Thanks to targzeta For This Post:
# 3  
Old 10-25-2013
Oh, it's a shame I didn't think of reading two variables at once. Your code has finished all the operations in just 2 minutes and 48 seconds!

Thank you very much indeed! Smilie
# 4  
Old 11-20-2013
Shorter

If in case you want to get only the top 10 directories in the current directory, you can try below command,
Code:
du /usr/ | sort -rn | awk 'NR>=2&&NR<=10 { print $2"\t" $1 }'


Last edited by vbe; 11-20-2013 at 05:31 AM.. Reason: code tags

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