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  • linux 权限计算

    2017-05-18 17:24:00
    linux 权限计算 eg:drwxr-xr-x  群组划分为:user、group、other  文件的权限分为:reader:r(4)、write:w(2)、execute:x(1)  划分wxr.....r-x.....r-x  计算:wrx:4+2+1=7、r-x:4+1=5、r-x:4+...

    linux 权限计算

    eg:drwxr-xr-x

      群组划分为:user、group、other

      文件的权限分为:reader:r(4)、write:w(2)、execute:x(1)

      划分wxr.....r-x.....r-x

      计算:wrx:4+2+1=7、r-x:4+1=5、r-x:4+1=5('-' 对应无权限)

      所以 'drwxr-xr-x' 的权限数值即为:755

     

    转载于:https://www.cnblogs.com/jx-yangbo/p/6874521.html

    展开全文
  • linux权限计算

    2013-09-06 13:12:04
    /* 现在有一数组中存放着 1、2、4、8这四个固定的数字 所有数字不能重复 我想封装一个函数 输入一个数字 找出这个数字是由哪几个数字组成的 比如: 输入7 找出的数字是1、2、4 输入15 找出的数字是1、2、4、8 ...
    /*
    现在有一数组中存放着 1、2、4、8这四个固定的数字 所有数字不能重复
    我想封装一个函数 输入一个数字 找出这个数字是由哪几个数字组成的
    比如:
    输入7 找出的数字是1、2、4
    输入15 找出的数字是1、2、4、8
    */
    #include <iostream>
    
    void permit(int n)
    {
    	for(int i=0;i<4;++i)
    	{
    		if(n&(1<<i))
    			std::cout<<(1<<i)<<" ";
    	}
    	std::cout<<std::endl;
    }
    
    int main(int argc,char* argv[])
    {
    	permit(7);
    	permit(15);
    	system("PAUSE");
    	return 0;
    }

    展开全文
  • Linux文件权限计算

    2020-12-05 12:59:22
    权限对应表 先记住以上两个表中rwx对应的数字,然后以下文件为例。-就是0,每三位为一组 再看两个例子 一个文件drwxr-xr-x那么就是755 一个文件-rw-r--r--那么就是644

    在这里插入图片描述
    权限对应表
    在这里插入图片描述
    先记住以上两个表中rwx对应的数字,然后以下文件为例。-就是0,每三位为一组
    在这里插入图片描述
    再看两个例子
    一个文件drwxr-xr-x那么就是755
    一个文件-rw-r--r--那么就是644

    展开全文
  • 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。...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...

     

    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

    转载于:https://www.cnblogs.com/xiaoxiaoleo/p/6794830.html

    展开全文
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