计算Linux权限掩码umask值

 

创建文件默认最大权限为666 （-rw-rw-rw-），默认创建的文件没有可执行权限x位。

创建目录默认最大权限777（-rwx-rwx-rwx）,默认创建的目录属主是有x权限，允许用户进入。

 

简单的python脚本计算umask对应的文件和目录权限

#!/usr/bin/python
# -*- coding: utf-8 -*-
#author:xiaoxiaoleo
#url:http://www.cnblogs.com/xiaoxiaoleo/

import itertools  


def file_perm(umask):
    out_per_list = []
    in_perm_list = '666'
    umask_list  = list(umask)
    for num  in range(len(umask_list)):
        if (int(umask_list[num]) % 2) == 0:
            out_per_list.append(int(in_perm_list[num]) - int(umask_list[num]))
        if (int(umask_list[num]) % 2) != 0:
            out_per_list.append(int(in_perm_list[num]) - int(umask_list[num])  + 1 )
        
    return ''.join(str(i) for i in out_per_list)

def dir_perm(umask):
    out_per_list = []
    in_perm_list = '777'
    umask_list  = list(umask)
    for num  in range(len(umask_list)):
            out_per_list.append(int(in_perm_list[num]) - int(umask_list[num]))
        
    return ''.join(str(i) for i in out_per_list)

def calc_perm(umask):
    print 'umask:%s file:%s dir:%s' % (umask,file_perm(umask),dir_perm(umask))


if __name__ == '__main__':
    calc_perm('123')

umask与文件目录权限对照表

umask:000 file:666 dir:777
umask:001 file:666 dir:776
umask:002 file:664 dir:775
umask:003 file:664 dir:774
umask:004 file:662 dir:773
umask:005 file:662 dir:772
umask:006 file:660 dir:771
umask:007 file:660 dir:770
umask:010 file:666 dir:767
umask:011 file:666 dir:766
umask:012 file:664 dir:765
umask:013 file:664 dir:764
umask:014 file:662 dir:763
umask:015 file:662 dir:762
umask:016 file:660 dir:761
umask:017 file:660 dir:760
umask:020 file:646 dir:757
umask:021 file:646 dir:756
umask:022 file:644 dir:755
umask:023 file:644 dir:754
umask:024 file:642 dir:753
umask:025 file:642 dir:752
umask:026 file:640 dir:751
umask:027 file:640 dir:750
umask:030 file:646 dir:747
umask:031 file:646 dir:746
umask:032 file:644 dir:745
umask:033 file:644 dir:744
umask:034 file:642 dir:743
umask:035 file:642 dir:742
umask:036 file:640 dir:741
umask:037 file:640 dir:740
umask:040 file:626 dir:737
umask:041 file:626 dir:736
umask:042 file:624 dir:735
umask:043 file:624 dir:734
umask:044 file:622 dir:733
umask:045 file:622 dir:732
umask:046 file:620 dir:731
umask:047 file:620 dir:730
umask:050 file:626 dir:727
umask:051 file:626 dir:726
umask:052 file:624 dir:725
umask:053 file:624 dir:724
umask:054 file:622 dir:723
umask:055 file:622 dir:722
umask:056 file:620 dir:721
umask:057 file:620 dir:720
umask:060 file:606 dir:717
umask:061 file:606 dir:716
umask:062 file:604 dir:715
umask:063 file:604 dir:714
umask:064 file:602 dir:713
umask:065 file:602 dir:712
umask:066 file:600 dir:711
umask:067 file:600 dir:710
umask:070 file:606 dir:707
umask:071 file:606 dir:706
umask:072 file:604 dir:705
umask:073 file:604 dir:704
umask:074 file:602 dir:703
umask:075 file:602 dir:702
umask:076 file:600 dir:701
umask:077 file:600 dir:700
umask:100 file:666 dir:677
umask:101 file:666 dir:676
umask:102 file:664 dir:675
umask:103 file:664 dir:674
umask:104 file:662 dir:673
umask:105 file:662 dir:672
umask:106 file:660 dir:671
umask:107 file:660 dir:670
umask:110 file:666 dir:667
umask:111 file:666 dir:666
umask:112 file:664 dir:665
umask:113 file:664 dir:664
umask:114 file:662 dir:663
umask:115 file:662 dir:662
umask:116 file:660 dir:661
umask:117 file:660 dir:660
umask:120 file:646 dir:657
umask:121 file:646 dir:656
umask:122 file:644 dir:655
umask:123 file:644 dir:654
umask:124 file:642 dir:653
umask:125 file:642 dir:652
umask:126 file:640 dir:651
umask:127 file:640 dir:650
umask:130 file:646 dir:647
umask:131 file:646 dir:646
umask:132 file:644 dir:645
umask:133 file:644 dir:644
umask:134 file:642 dir:643
umask:135 file:642 dir:642
umask:136 file:640 dir:641
umask:137 file:640 dir:640
umask:140 file:626 dir:637
umask:141 file:626 dir:636
umask:142 file:624 dir:635
umask:143 file:624 dir:634
umask:144 file:622 dir:633
umask:145 file:622 dir:632
umask:146 file:620 dir:631
umask:147 file:620 dir:630
umask:150 file:626 dir:627
umask:151 file:626 dir:626
umask:152 file:624 dir:625
umask:153 file:624 dir:624
umask:154 file:622 dir:623
umask:155 file:622 dir:622
umask:156 file:620 dir:621
umask:157 file:620 dir:620
umask:160 file:606 dir:617
umask:161 file:606 dir:616
umask:162 file:604 dir:615
umask:163 file:604 dir:614
umask:164 file:602 dir:613
umask:165 file:602 dir:612
umask:166 file:600 dir:611
umask:167 file:600 dir:610
umask:170 file:606 dir:607
umask:171 file:606 dir:606
umask:172 file:604 dir:605
umask:173 file:604 dir:604
umask:174 file:602 dir:603
umask:175 file:602 dir:602
umask:176 file:600 dir:601
umask:177 file:600 dir:600
umask:200 file:466 dir:577
umask:201 file:466 dir:576
umask:202 file:464 dir:575
umask:203 file:464 dir:574
umask:204 file:462 dir:573
umask:205 file:462 dir:572
umask:206 file:460 dir:571
umask:207 file:460 dir:570
umask:210 file:466 dir:567
umask:211 file:466 dir:566
umask:212 file:464 dir:565
umask:213 file:464 dir:564
umask:214 file:462 dir:563
umask:215 file:462 dir:562
umask:216 file:460 dir:561
umask:217 file:460 dir:560
umask:220 file:446 dir:557
umask:221 file:446 dir:556
umask:222 file:444 dir:555
umask:223 file:444 dir:554
umask:224 file:442 dir:553
umask:225 file:442 dir:552
umask:226 file:440 dir:551
umask:227 file:440 dir:550
umask:230 file:446 dir:547
umask:231 file:446 dir:546
umask:232 file:444 dir:545
umask:233 file:444 dir:544
umask:234 file:442 dir:543
umask:235 file:442 dir:542
umask:236 file:440 dir:541
umask:237 file:440 dir:540
umask:240 file:426 dir:537
umask:241 file:426 dir:536
umask:242 file:424 dir:535
umask:243 file:424 dir:534
umask:244 file:422 dir:533
umask:245 file:422 dir:532
umask:246 file:420 dir:531
umask:247 file:420 dir:530
umask:250 file:426 dir:527
umask:251 file:426 dir:526
umask:252 file:424 dir:525
umask:253 file:424 dir:524
umask:254 file:422 dir:523
umask:255 file:422 dir:522
umask:256 file:420 dir:521
umask:257 file:420 dir:520
umask:260 file:406 dir:517
umask:261 file:406 dir:516
umask:262 file:404 dir:515
umask:263 file:404 dir:514
umask:264 file:402 dir:513
umask:265 file:402 dir:512
umask:266 file:400 dir:511
umask:267 file:400 dir:510
umask:270 file:406 dir:507
umask:271 file:406 dir:506
umask:272 file:404 dir:505
umask:273 file:404 dir:504
umask:274 file:402 dir:503
umask:275 file:402 dir:502
umask:276 file:400 dir:501
umask:277 file:400 dir:500
umask:300 file:466 dir:477
umask:301 file:466 dir:476
umask:302 file:464 dir:475
umask:303 file:464 dir:474
umask:304 file:462 dir:473
umask:305 file:462 dir:472
umask:306 file:460 dir:471
umask:307 file:460 dir:470
umask:310 file:466 dir:467
umask:311 file:466 dir:466
umask:312 file:464 dir:465
umask:313 file:464 dir:464
umask:314 file:462 dir:463
umask:315 file:462 dir:462
umask:316 file:460 dir:461
umask:317 file:460 dir:460
umask:320 file:446 dir:457
umask:321 file:446 dir:456
umask:322 file:444 dir:455
umask:323 file:444 dir:454
umask:324 file:442 dir:453
umask:325 file:442 dir:452
umask:326 file:440 dir:451
umask:327 file:440 dir:450
umask:330 file:446 dir:447
umask:331 file:446 dir:446
umask:332 file:444 dir:445
umask:333 file:444 dir:444
umask:334 file:442 dir:443
umask:335 file:442 dir:442
umask:336 file:440 dir:441
umask:337 file:440 dir:440
umask:340 file:426 dir:437
umask:341 file:426 dir:436
umask:342 file:424 dir:435
umask:343 file:424 dir:434
umask:344 file:422 dir:433
umask:345 file:422 dir:432
umask:346 file:420 dir:431
umask:347 file:420 dir:430
umask:350 file:426 dir:427
umask:351 file:426 dir:426
umask:352 file:424 dir:425
umask:353 file:424 dir:424
umask:354 file:422 dir:423
umask:355 file:422 dir:422
umask:356 file:420 dir:421
umask:357 file:420 dir:420
umask:360 file:406 dir:417
umask:361 file:406 dir:416
umask:362 file:404 dir:415
umask:363 file:404 dir:414
umask:364 file:402 dir:413
umask:365 file:402 dir:412
umask:366 file:400 dir:411
umask:367 file:400 dir:410
umask:370 file:406 dir:407
umask:371 file:406 dir:406
umask:372 file:404 dir:405
umask:373 file:404 dir:404
umask:374 file:402 dir:403
umask:375 file:402 dir:402
umask:376 file:400 dir:401
umask:377 file:400 dir:400
umask:400 file:266 dir:377
umask:401 file:266 dir:376
umask:402 file:264 dir:375
umask:403 file:264 dir:374
umask:404 file:262 dir:373
umask:405 file:262 dir:372
umask:406 file:260 dir:371
umask:407 file:260 dir:370
umask:410 file:266 dir:367
umask:411 file:266 dir:366
umask:412 file:264 dir:365
umask:413 file:264 dir:364
umask:414 file:262 dir:363
umask:415 file:262 dir:362
umask:416 file:260 dir:361
umask:417 file:260 dir:360
umask:420 file:246 dir:357
umask:421 file:246 dir:356
umask:422 file:244 dir:355
umask:423 file:244 dir:354
umask:424 file:242 dir:353
umask:425 file:242 dir:352
umask:426 file:240 dir:351
umask:427 file:240 dir:350
umask:430 file:246 dir:347
umask:431 file:246 dir:346
umask:432 file:244 dir:345
umask:433 file:244 dir:344
umask:434 file:242 dir:343
umask:435 file:242 dir:342
umask:436 file:240 dir:341
umask:437 file:240 dir:340
umask:440 file:226 dir:337
umask:441 file:226 dir:336
umask:442 file:224 dir:335
umask:443 file:224 dir:334
umask:444 file:222 dir:333
umask:445 file:222 dir:332
umask:446 file:220 dir:331
umask:447 file:220 dir:330
umask:450 file:226 dir:327
umask:451 file:226 dir:326
umask:452 file:224 dir:325
umask:453 file:224 dir:324
umask:454 file:222 dir:323
umask:455 file:222 dir:322
umask:456 file:220 dir:321
umask:457 file:220 dir:320
umask:460 file:206 dir:317
umask:461 file:206 dir:316
umask:462 file:204 dir:315
umask:463 file:204 dir:314
umask:464 file:202 dir:313
umask:465 file:202 dir:312
umask:466 file:200 dir:311
umask:467 file:200 dir:310
umask:470 file:206 dir:307
umask:471 file:206 dir:306
umask:472 file:204 dir:305
umask:473 file:204 dir:304
umask:474 file:202 dir:303
umask:475 file:202 dir:302
umask:476 file:200 dir:301
umask:477 file:200 dir:300
umask:500 file:266 dir:277
umask:501 file:266 dir:276
umask:502 file:264 dir:275
umask:503 file:264 dir:274
umask:504 file:262 dir:273
umask:505 file:262 dir:272
umask:506 file:260 dir:271
umask:507 file:260 dir:270
umask:510 file:266 dir:267
umask:511 file:266 dir:266
umask:512 file:264 dir:265
umask:513 file:264 dir:264
umask:514 file:262 dir:263
umask:515 file:262 dir:262
umask:516 file:260 dir:261
umask:517 file:260 dir:260
umask:520 file:246 dir:257
umask:521 file:246 dir:256
umask:522 file:244 dir:255
umask:523 file:244 dir:254
umask:524 file:242 dir:253
umask:525 file:242 dir:252
umask:526 file:240 dir:251
umask:527 file:240 dir:250
umask:530 file:246 dir:247
umask:531 file:246 dir:246
umask:532 file:244 dir:245
umask:533 file:244 dir:244
umask:534 file:242 dir:243
umask:535 file:242 dir:242
umask:536 file:240 dir:241
umask:537 file:240 dir:240
umask:540 file:226 dir:237
umask:541 file:226 dir:236
umask:542 file:224 dir:235
umask:543 file:224 dir:234
umask:544 file:222 dir:233
umask:545 file:222 dir:232
umask:546 file:220 dir:231
umask:547 file:220 dir:230
umask:550 file:226 dir:227
umask:551 file:226 dir:226
umask:552 file:224 dir:225
umask:553 file:224 dir:224
umask:554 file:222 dir:223
umask:555 file:222 dir:222
umask:556 file:220 dir:221
umask:557 file:220 dir:220
umask:560 file:206 dir:217
umask:561 file:206 dir:216
umask:562 file:204 dir:215
umask:563 file:204 dir:214
umask:564 file:202 dir:213
umask:565 file:202 dir:212
umask:566 file:200 dir:211
umask:567 file:200 dir:210
umask:570 file:206 dir:207
umask:571 file:206 dir:206
umask:572 file:204 dir:205
umask:573 file:204 dir:204
umask:574 file:202 dir:203
umask:575 file:202 dir:202
umask:576 file:200 dir:201
umask:577 file:200 dir:200
umask:600 file:066 dir:177
umask:601 file:066 dir:176
umask:602 file:064 dir:175
umask:603 file:064 dir:174
umask:604 file:062 dir:173
umask:605 file:062 dir:172
umask:606 file:060 dir:171
umask:607 file:060 dir:170
umask:610 file:066 dir:167
umask:611 file:066 dir:166
umask:612 file:064 dir:165
umask:613 file:064 dir:164
umask:614 file:062 dir:163
umask:615 file:062 dir:162
umask:616 file:060 dir:161
umask:617 file:060 dir:160
umask:620 file:046 dir:157
umask:621 file:046 dir:156
umask:622 file:044 dir:155
umask:623 file:044 dir:154
umask:624 file:042 dir:153
umask:625 file:042 dir:152
umask:626 file:040 dir:151
umask:627 file:040 dir:150
umask:630 file:046 dir:147
umask:631 file:046 dir:146
umask:632 file:044 dir:145
umask:633 file:044 dir:144
umask:634 file:042 dir:143
umask:635 file:042 dir:142
umask:636 file:040 dir:141
umask:637 file:040 dir:140
umask:640 file:026 dir:137
umask:641 file:026 dir:136
umask:642 file:024 dir:135
umask:643 file:024 dir:134
umask:644 file:022 dir:133
umask:645 file:022 dir:132
umask:646 file:020 dir:131
umask:647 file:020 dir:130
umask:650 file:026 dir:127
umask:651 file:026 dir:126
umask:652 file:024 dir:125
umask:653 file:024 dir:124
umask:654 file:022 dir:123
umask:655 file:022 dir:122
umask:656 file:020 dir:121
umask:657 file:020 dir:120
umask:660 file:006 dir:117
umask:661 file:006 dir:116
umask:662 file:004 dir:115
umask:663 file:004 dir:114
umask:664 file:002 dir:113
umask:665 file:002 dir:112
umask:666 file:000 dir:111
umask:667 file:000 dir:110
umask:670 file:006 dir:107
umask:671 file:006 dir:106
umask:672 file:004 dir:105
umask:673 file:004 dir:104
umask:674 file:002 dir:103
umask:675 file:002 dir:102
umask:676 file:000 dir:101
umask:677 file:000 dir:100
umask:700 file:066 dir:077
umask:701 file:066 dir:076
umask:702 file:064 dir:075
umask:703 file:064 dir:074
umask:704 file:062 dir:073
umask:705 file:062 dir:072
umask:706 file:060 dir:071
umask:707 file:060 dir:070
umask:710 file:066 dir:067
umask:711 file:066 dir:066
umask:712 file:064 dir:065
umask:713 file:064 dir:064
umask:714 file:062 dir:063
umask:715 file:062 dir:062
umask:716 file:060 dir:061
umask:717 file:060 dir:060
umask:720 file:046 dir:057
umask:721 file:046 dir:056
umask:722 file:044 dir:055
umask:723 file:044 dir:054
umask:724 file:042 dir:053
umask:725 file:042 dir:052
umask:726 file:040 dir:051
umask:727 file:040 dir:050
umask:730 file:046 dir:047
umask:731 file:046 dir:046
umask:732 file:044 dir:045
umask:733 file:044 dir:044
umask:734 file:042 dir:043
umask:735 file:042 dir:042
umask:736 file:040 dir:041
umask:737 file:040 dir:040
umask:740 file:026 dir:037
umask:741 file:026 dir:036
umask:742 file:024 dir:035
umask:743 file:024 dir:034
umask:744 file:022 dir:033
umask:745 file:022 dir:032
umask:746 file:020 dir:031
umask:747 file:020 dir:030
umask:750 file:026 dir:027
umask:751 file:026 dir:026
umask:752 file:024 dir:025
umask:753 file:024 dir:024
umask:754 file:022 dir:023
umask:755 file:022 dir:022
umask:756 file:020 dir:021
umask:757 file:020 dir:020
umask:760 file:006 dir:017
umask:761 file:006 dir:016
umask:762 file:004 dir:015
umask:763 file:004 dir:014
umask:764 file:002 dir:013
umask:765 file:002 dir:012
umask:766 file:000 dir:011
umask:767 file:000 dir:010
umask:770 file:006 dir:007
umask:771 file:006 dir:006
umask:772 file:004 dir:005
umask:773 file:004 dir:004
umask:774 file:002 dir:003
umask:775 file:002 dir:002
umask:776 file:000 dir:001
umask:777 file:000 dir:000

　　

REF:http://oldboy.blog.51cto.com/2561410/1060032