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4: 7:.2:
6: 7:.2:
10: 7:.2:
12: 7:.2:
dist: 7:.2:
price_break_id1:  9:.0:
price_break_id2:  9:.0:
price_break_id4:  9:.0:
price_break_id6:  9:.0:
price_break_id10:  9:.0:
price_break_id12:  9:.0:
price_break_iddist:  9:.0:
2: 7:.2:

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                 6:  7:.2:
                10:  7:.2:
                12:  7:.2:
              dist:  7:.2:
   price_break_id1:  9:.0:
   price_break_id2:  9:.0:
   price_break_id4:  9:.0:
   price_break_id6:  9:.0:
  price_break_id10:  9:.0:
  price_break_id12:  9:.0:
price_break_iddist:  9:.0:
                 2:  7:.2:

inputfile=dunpealslyr.in
maxLength=$(awk -F: '{ if (x < length($1)) x = length($1) } END { print x }'  $inputfile)
while IFS=: read one two three; do printf '%'$maxLength's:%3s:%s:\n' "$one" "$two" "$three"; done < $inputfile
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                 6:  7:.2:
                10:  7:.2:
                12:  7:.2:
              dist:  7:.2:
   price_break_id1:  9:.0:
   price_break_id2:  9:.0:
   price_break_id4:  9:.0:
   price_break_id6:  9:.0:
  price_break_id10:  9:.0:
  price_break_id12:  9:.0:
price_break_iddist:  9:.0:
                 2:  7:.2:

awk -F: 'NR==FNR { l=length($1); max=(l>max)?l:max; next; } { printf("%"max"s:%3s:%s:\n", $1,$2,$3); }' input.txt input.txt