dumpfs

This WAS Apple's macOS versinon.
Linux version is at dumpe2fs

smacker:/sbin root# dumpfs /dev/disk0s14

dumpfs [filesys | special-device]

Displays the super block and cylinder group information for the file system or special device specified.
file system information such as the file system block size and minimum free space percentage.

magic11954timeSat Jun 23 20:52:50 2007
cylgrpdynamicinodes4.4BSD
nbfree251914ndir2nifree251708nffree 9
ncg57ncyl508size1039832blocks 1007667
bsize4096shift12mask FFFFF000
fsize1024shift10mask FFFFFC00
frag4shift2fsbtodb1
cpg9bpg4608fpg18432ipg4416
minfree5%optimtimemaxcontig32maxbpg1024
rotdelay0 msheadswitch0ustrackseek0usrps60
ntrak128nsect32npsect32spc4096
symlinklen60trackskew0interleave1contigsumsize16
nindir1024inopb32nspf2
sblkno16cblkno24iblkno28dblkno 580
sbsize2048cgsize4096cgoffset16cgmask FFFFFF80
csaddr580cssize1024shift8mask FFFFFF00
cgrotor0fmod0ronly0clean1 
blocks available in each of 8 rotational positions
cylinder number 0:
position 0:      0    4    8   12   …   496  500  504  508
position 2:      1    5    9   13   …   497  501  505  509
position 4:      2    6   10   14   …   498  502  506  510 
position 6:      3    7   11   15   …   499  503  507  511

cs[].cs_(nbfree,ndir,nifree,nffree):
(4461,1,4413,6) (4467,0,4416,0) (4467,0,4416,0) ...  (4467,0,4416,0) (1769,0,4416,0) 
cylinders in last group 4
blocks in last group 2048

cg 0 1 2 3 4 5 6 7 8  …   54 55 56:




cg 0:
magic   90255   tell    00006000    time    Sat Jun 23 20:48:27 2007
cgx     0       ncyl    9       niblk   4416    ndblk   18432 nbfree  4461    
ndir    1       nifree  4413    nffree  6
rotor   0       irotor  0       frotor  0 
frsum   0       0       2       sum of frsum: 6
clusters 1-15:  0      ... 0
clusters size 16 and over: 1 clusters free:  147-4607 
iused:  0-2 free:   581-583, 585-18431
b:
c0:  (365)    91 91 91 92
...
c8:  (512)    128 128 128 128

cg 1:
magic   90255   tell    0120a000 time    Sat Jun 23 20:48:27 2007
cgx     1       ncyl    9       niblk   4416    ndblk   18432 nbfree  4467    
ndir    0       nifree  4416    nffree  0
rotor   0       irotor  0       frotor  0 
frsum   0       0       0       sum of frsum: 0
clusters 1-15:  0   0   0   0   0   0    0   1   0   0   0  0   0    0    0
clusters size 16 and over: 1 clusters free:  0-7, 149-4607 
iused: free:   0-31, 596-18431
b:
c0:  (371)    92 93 93 93
...
c8:  (512)    128 128 128 128



cg 2:
magic   90255   tell    0240e000 time    Sat Jun 23 20:48:27 2007
cgx     2       ncyl    9       niblk   4416    ndblk   18432 nbfree  4467    
ndir    0       
rotor   0       irotor  0       frotor  0 
frsum   0       0       0

clusters 1-15:   0    ...    0
clusters size 16 and over: 1 clusters free:  0-11, 153-4607 
iused: free:   0-47, 612-18431
b:
c0:  (371)    92 93 93 93
...
c8:  (512)    128 128 128 128
horrible propensity for making tables with in keyword:value format instead of column headings

cg tell    niblkndblknbfreeclusters free i free
3 03612000 0-15, 157-4607 0-63, 628-18431
4 04816000 0-19, 161-4607 0-79, 644-18431
5 05a1a000 0-23, 165-4607 0-95, 660-18431
6 06c1e000 0-27, 169-4607 0-111, 676-18431
7 07e22000 0-31, 173-4607 0-127, 692-18431
8 09026000 0-35, 177-4607 0-143, 708-18431
9 0a22a000 0-39, 181-4607 0-159, 724-18431
10 0b42e000 0-43, 185-4607 0-175, 740-18431
11 0c632000 0-47, 189-4607 0-191, 756-18431
12 0d836000 0-51, 193-4607 0-207, 772-18431
13 0ea3a000 0-55, 197-4607 0-223, 788-18431
14 0fc3e000 0-59, 201-4607 0-239, 804-18431
15 10e42000 0-63, 205-4607 0-255, 820-18431
16 12046000 0-67, 209-4607 0-271, 836-18431
17 1324a000 0-71, 213-4607 0-287, 852-18431
18 1444e000 0-75, 217-4607 0-303, 868-18431
19 15652000 0-79, 221-4607 0-319, 884-18431
20 16856000 4416*1*X 0-83, 225-4607 0-335, 900-18431
21 17a5a000 0-87, 229-4607 0-351, 916-18431
22 18c5e000 0-91, 233-4607 0-367, 932-18431
23 19e62000 0-95, 237-4607 0-383, 948-18431
24 1b066000 *4*1*X 0-99, 241-4607 0-399, 964-18431
25 1c26a000 *4*1*X 0-103, 245-4607 0-415, 980-18431
26 1d46e000 *4*1*X 0-107, 249-4607 0-431, 996-18431
27 1e672000 *4*1*X 0-111, 253-4607 0-447, 1012-18431
28 1f876000 *4*1*X 0-115, 257-4607 0-463, 1028-18431
29 20a7a000 *4*1*X 0-119, 261-4607 0-479, 1044-18431
30 21c7e000 *4*1*X 0-123, 265-4607 0-495, 1060-18431
31 22e82000 *4*1*X 0-127, 269-4607 0-511, 1076-18431
32 24086000 *4*1*X 0-131, 273-4607 0-527, 1092-18431
33 2528a000 *4*1*X 0-135, 277-4607 0-543, 1108-18431
34 2648e000 *4*1*X 0-139, 281-4607 0-559, 1124-18431
35 27692000 *4*1*X 0-143, 285-4607 0-575, 1140-18431
36 28896000 *4*1*X 0-147, 289-4607 0-591, 1156-18431
37 29a9a000 *4*1*X 0-151, 293-4607 0-607, 1172-18431
38 2ac9e000 *4*1*X 0-155, 297-4607 0-623, 1188-18431
39 2bea2000 *4*1*X 0-159, 301-4607 0-639, 1204-18431
40 2d0a6000 *4*1*X 0-163, 305-4607 0-655, 1220-18431
41 2e2aa000 *4*1*X 0-167, 309-4607 0-671, 1236-18431
42 2f4ae000 *4*1*X 0-171, 313-4607 0-687, 1252-18431
43 306b2000 *4*1*X 0-175, 317-4607 0-703, 1268-18431
44 318b6000 *4*14466 0, 2-179, 321-4607 0-3, 5-719, 1284-18431
ndir user:1
nifree 4415
nffree 3
frsum 00 1 uusum of frsum: 3
clusters 1-8: 1 00 0 0 0 0 0
Sat Jun 23 20:52:45 2007
c0: (370) 92 92 93 93
45 32aba000 *4*1*X 0-183, 325-4607 0-735, 1300-18431
46 33cbe000 *4*1*X 0-187, 329-4607 0-751, 1316-18431
47 34ec2000 *4*1*X 0-191, 333-4607 0-767, 1332-18431
48 360c6000 *4*1*X 0-195, 337-4607 0-783, 1348-18431
49 372ca000 *4*1*X 0-199, 341-4607 0-799, 1364-18431
50 384ce000 *4*1*X 0-203, 345-4607 0-815, 1380-18431
51 396d2000 *4*1*X 0-207, 349-4607 0-831, 1396-18431
52 3a8d6000 *4*1*X 0-211, 353-4607 0-847, 1412-18431
53 3bada000 *4*1*X 0-215, 357-4607 0-863, 1428-18431
54 3ccde000 *4*1*X 0-219, 361-4607 0-879, 1444-18431
55 3dee2000 *4*1*X 0-223, 365-4607 0-895, 1460-18431
56 3f0e6000 *47640 1769 0-227, 369-1909 0-911, 1476-7639
ncyl 4

*1 = 18432
*4 = 4416
*x = 4467