hist.awk

hist.awk

#!/usr/bin/awk -f
# Original script: https://stackoverflow.com/a/39637429/1637178
# License: https://creativecommons.org/licenses/by-sa/3.0/

# This one works with integers
# Example:
#   $ du -s some_folder/* | awk '{ print $1; }' > sizes
#   $ ./hist.awk sizes
#
# Change bin_width, bar_scale_down and %5d accordingly

BEGIN{
    bin_width=1000;
    bar_scale_down=100;

    # substr trick source: https://stackoverflow.com/a/68796165/1637178
    # Basically repeat("=", n) = substr("========================", 1, n)
    base_bar="========================================================================================================================================="
}
{
    bin=int(($1-0.0001)/bin_width);
    if( bin in hist){
        hist[bin]+=1
    }else{
        hist[bin]=1
    }
}
END{
    for (h in hist)
        printf " * > %5d  -> [%5d] %s \n", h*bin_width, hist[h], substr(base_bar, 1, hist[h]/bar_scale_down)
}