{"id":604,"date":"2016-04-15T15:45:57","date_gmt":"2016-04-15T07:45:57","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=604"},"modified":"2016-04-15T15:45:57","modified_gmt":"2016-04-15T07:45:57","slug":"%e9%80%89%e5%8f%96%e5%91%bd%e4%bb%a4cut","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/%e9%80%89%e5%8f%96%e5%91%bd%e4%bb%a4cut\/","title":{"rendered":"\u9009\u53d6\u547d\u4ee4cut"},"content":{"rendered":"

cut\u547d\u4ee4\u4ece\u6587\u4ef6\u7684\u6bcf\u4e00\u884c\u526a\u5207\u5b57\u8282\u3001\u5b57\u7b26\u548c\u5b57\u6bb5\u5e76\u5c06\u8fd9\u4e9b\u5b57\u8282\u3001\u5b57\u7b26\u548c\u5b57\u6bb5\u5199\u81f3\u6807\u51c6\u8f93\u51fa.\u5982\u679c\u4e0d\u6307\u5b9aFIle\u53c2\u6570,cut\u547d\u4ee4\u5c06\u8bfb\u53d6\u6807\u51c6\u8f93\u5165.<\/p>\n

\u8bed\u6cd5:<\/p>\n

cut\u00a0-b[n]\u00a0\u5b57\u8282\u8303\u56f4<\/p>\n

cut\u00a0-c\u00a0\u5b57\u7b26\u8303\u56f4<\/p>\n

cut\u00a0-d\u00a0\u2018\u5206\u9694\u5b57\u7b26\u2019\u00a0-f\u00a0fields<\/p>\n

\u53c2\u6570:<\/p>\n

-b\u00a0:\u00a0\u4ee5\u5b57\u8282(bytes)\u4e3a\u5355\u4f4d\u8fdb\u884c\u5206\u5272,\u8fd9\u4e9b\u5b57\u8282\u4f4d\u7f6e\u5c06\u5ffd\u7565\u591a\u5b57\u8282\u5b57\u7b26\u8fb9\u754c,\u9664\u975e\u4e5f\u6307\u5b9a\u4e86<\/p>\n

-n\u6807\u5fd7;<\/p>\n

-c\u00a0:\u00a0\u4ee5\u5b57\u7b26(characters)\u4e3a\u5355\u4f4d\u8fdb\u884c\u5206\u5272;<\/p>\n

-d\u00a0:\u00a0\u81ea\u5b9a\u4e49\u5206\u9694\u7b26,\u9ed8\u8ba4\u4e3a\u5236\u8868\u7b26,\u4e0e-f\u4e00\u8d77\u4f7f\u7528;<\/p>\n

-f\u00a0:\u00a0\u4f9d\u636e-d\u00a0\u5206\u9694\u5b57\u7b26\u5c06\u4e00\u6bb5\u4fe1\u606f\u5207\u5272\u6210\u6570\u6bb5,\u7528-f(fields)\u00a0\u53d6\u51fa\u7b2c\u51e0\u6bb5\u7684\u610f\u601d;<\/p>\n

-n\u00a0:\u00a0\u53d6\u6d88\u5206\u5272\u5b57\u8282\u5b57\u7b26.\u4ec5\u548c-b\u6807\u5fd7\u4e00\u8d77\u4f7f\u7528.\u5982\u679c\u5b57\u7b26\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u843d\u5728-b\u6807\u5fd7\u7684list<\/p>\n

\u53c2\u6570\u6307\u793a<br\u00a0\/>\u8303\u56f4\u4e4b\u5185,\u8be5\u5b57\u7b26\u5c06\u88ab\u5199\u5165;\u5426\u5219,\u8be5\u5b57\u7b26\u5c06\u88ab\u6392\u9664.<\/p>\n

 <\/p>\n

\u5b9e\u9a8c\u73af\u5883:<\/p>\n

\u4e3a\u4e86\u4f7f\u6587\u6863\u80fd\u8bc6\u522b\u4e2d\u6587,\u8fd9\u91cc\u6211\u628a\u8bed\u7cfb\u6539\u4e3a\u4e86LANG=zh_CN.gb2312.\u00a0\u7f16\u7801gb2312\u4e0b,\u4e00\u4e2a\u6c49\u5b57\u53602\u4e2a\u5b57\u8282.<\/p>\n

<1>\u4ee5\u201d\u5b57\u8282\u201d\u5b9a\u4f4d<\/p>\n

\u5e38\u89c1\u5b57\u8282\u8303\u56f4\u9009\u9879:<\/p>\n

n\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0 \u6570\u5b57,\u8868\u793a\u9009\u53d6\u7b2cn\u4e2a\u5b57\u8282;<\/p>\n

1-3,8\u00a0\u00a0\u8868\u793a\u9009\u53d6\u7b2c1\u00a0\u30012\u3001\u00a03\u00a0\u548c8\u4e2a\u5b57\u8282;<\/p>\n

-3\u00a0\u00a0\u00a0 \u00a0\u00a0 \u8868\u793a\u9009\u53d6\u7b2c\u4e00\u4e2a\u5b57\u8282\u5230\u7b2c\u4e09\u4e2a\u5b57\u8282;<\/p>\n

3-\u00a0\u00a0\u00a0 \u00a0 \u8868\u793a\u9009\u53d6\u7b2c\u4e09\u4e2a\u5b57\u8282\u5230\u884c\u5c3e;<\/p>\n

 <\/p>\n

\u5b9e\u4f8b1:<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0\/etc\/passwd\u00a0|head\u00a0-5\u00a0|cut\u00a0-b\u00a03-5,8<\/p>\n

ot:0<\/p>\n

n:x:<\/p>\n

emox<\/p>\n

m:x:<\/p>\n

:x:7<\/p>\n

 <\/p>\n

<2>\u4ee5\u201d\u5b57\u7b26\u201d\u5b9a\u4f4d<\/p>\n

\u5e38\u89c1\u5b57\u7b26\u8303\u56f4\u9009\u9879:<\/p>\n

n\u00a0\u00a0 \u00a0 \u00a0 \u00a0 \u6570\u5b57,\u8868\u793a\u9009\u53d6\u7b2cn\u4e2a\u5b57\u7b26;<\/p>\n

1-3,8\u00a0\u00a0\u8868\u793a\u9009\u53d6\u7b2c1\u00a0\u30012\u3001\u00a03\u00a0\u548c8\u4e2a\u5b57\u7b26;<\/p>\n

-3\u00a0\u00a0\u00a0 \u00a0 \u8868\u793a\u9009\u53d6\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5230\u7b2c\u4e09\u4e2a\u5b57\u7b26;<\/p>\n

3-\u00a0\u00a0\u00a0 \u00a0 \u8868\u793a\u9009\u53d6\u7b2c\u4e09\u4e2a\u5b57\u7b26\u5230\u884c\u5c3e;<\/p>\n

 <\/p>\n

\u5b9e\u4f8b2:<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0\/etc\/passwd\u00a0|head\u00a0-5\u00a0|cut\u00a0-b\u00a03-5,8<\/p>\n

ot:0<\/p>\n

n:x:<\/p>\n

emox<\/p>\n

m:x:<\/p>\n

:x:7<\/p>\n

\u901a\u8fc7\u89c2\u5bdf\u5b9e\u4f8b1\u4e0e\u5b9e\u4f8b2\u770b\u7740-b\u00a0-c\u00a0\u6ca1\u6709\u4ec0\u4e48\u533a\u522b\u5462?\u5176\u5b9e\u4e0d\u7136,\u9762\u5bf9\u5355\u5b57\u8282\u5b57\u7b26,-b\u4e0e-c\u6ca1\u6709\u533a\u522b,\u82e5\u8981\u63d0\u53d6\u4e2d\u6587,\u533a\u522b\u5c31\u5f88\u660e\u663e\u4e86.<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0test.txt\u00a0|\u00a0cut\u00a0-b\u00a03<\/p>\n

3<\/p>\n

C<\/p>\n

?<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0test.txt\u00a0|\u00a0cut\u00a0-c\u00a03<\/p>\n

3<\/p>\n

C<\/p>\n

\u4e09<\/p>\n

\u770b\u5230\u4e86\u5427,\u7528-c\u5219\u4f1a\u4ee5\u5b57\u7b26\u4e3a\u5355\u4f4d,\u8f93\u51fa\u6b63\u5e38;\u800c-b\u53ea\u4f1a\u4ee5\u5b57\u8282(8\u4f4d\u4e8c\u8fdb\u5236\u4f4d)\u6765\u8ba1\u7b97,\u8f93\u51fa\u5c31\u662f\u4e71\u7801\u4e86.\u4f46\u662f\u9047\u5230\u591a\u5b57\u8282\u5b57\u7b26\u65f6,\u6211\u4eec\u4ea6\u53ef\u4ee5\u4f7f\u7528-n\u9009\u9879,-n\u7528\u4e8e\u544a\u8bc9cut\u4e0d\u8981\u5c06\u591a\u5b57\u8282\u62c6\u5f00.,\u5982\u4e0b:<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0test.txt\u00a0|\u00a0cut\u00a0-nb\u00a03<\/p>\n

3<\/p>\n

C<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0test.txt\u00a0|\u00a0cut\u00a0-nb\u00a03-5,8<\/p>\n

3458<\/p>\n

CDEH<\/p>\n

\u4e8c\u56db<\/p>\n

 <\/p>\n

<3>\u4ee5\u201d\u5206\u9694\u7b26\u201d\u5b9a\u4f4d<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0\/etc\/passwd\u00a0|head\u00a0-5\u00a0|cut\u00a0-d\u00a0“:”\u00a0-f\u00a03<\/p>\n

0<\/p>\n

1<\/p>\n

2<\/p>\n

3<\/p>\n

4<\/p>\n

[root@sqj2015\u00a0~]#\u00a0cat\u00a0\/etc\/passwd\u00a0|head\u00a0-5\u00a0|cut\u00a0-d\u00a0“:”\u00a0-f\u00a03-5,8<\/p>\n

0:0:root<\/p>\n

1:1:bin<\/p>\n

2:2:daemon<\/p>\n

3:4:adm<\/p>\n

4:7:lp<\/p>\n

\u8fd9\u91cc\u7528-d\u8bbe\u7f6e\u95f4\u9694\u7b26\u4e3a\u5192\u53f7\u201d:\u201d,\u7136\u540e\u7528-f\u6765\u8bbe\u7f6e\u6211\u8981\u9009\u53d6\u7b2c\u51e0\u6bb5\u6765\u622a\u53d6\u4f60\u9700\u8981\u7684\u6570\u636e.<\/p>\n

 <\/p>\n

[root@sqj2015\u00a0~]#\u00a0last\u00a0|\u00a0head\u00a0-3<\/p>\n

root\u00a0\u00a0\u00a0\u00a0\u00a0pts\/1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a061.191.20.30\u00a0\u00a0\u00a0\u00a0\u00a0Thu\u00a0Apr\u00a014\u00a001:27\u00a0\u00a0\u00a0still\u00a0logged\u00a0in<\/p>\n

root\u00a0\u00a0\u00a0\u00a0\u00a0pts\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a061.191.20.30\u00a0\u00a0\u00a0\u00a0\u00a0Thu\u00a0Apr\u00a014\u00a000:23\u00a0\u00a0\u00a0still\u00a0logged\u00a0in<\/p>\n

root\u00a0\u00a0\u00a0\u00a0\u00a0pts\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a061.191.20.30\u00a0\u00a0\u00a0\u00a0\u00a0Wed\u00a0Apr\u00a013\u00a023:05\u00a0–\u00a000:23\u00a0\u00a0(01:17)<\/p>\n

 <\/p>\n

[root@sqj2015\u00a0~]#\u00a0last\u00a0|\u00a0head\u00a0-3\u00a0|\u00a0cut\u00a0-d\u00a0‘\u00a0‘\u00a0-f\u00a01<\/p>\n

root<\/p>\n

root<\/p>\n

root<\/p>\n

[root@sqj2015\u00a0~]#\u00a0last\u00a0|\u00a0head\u00a0-3\u00a0|\u00a0cut\u00a0-d\u00a0‘\u00a0‘\u00a0-f\u00a01,3<\/p>\n

root<\/p>\n

root<\/p>\n

root<\/p>\n

cut\u00a0-d\u00a0\u2018\u00a0\u2019\u00a0-f\u00a03\u00a0\u2018\u2019\u00a0\u4e4b\u95f4\u6709\u7a7a\u683c;\u8f93\u51fa\u7ed3\u679c\u6211\u4eec\u53d1\u73b0\u7b2c\u4e00\u4e2a\u7a7a\u767d\u5206\u5272\u7684\u5b57\u6bb5\u4ee3\u8868\u8d26\u53f7,\u6240\u4ee5\u4f7f\u7528\u4ee5\u4e0a\u547d\u4ee4;\u4f46\u662froot\u00a0pts\/0\u4e4b\u95f4\u7a7a\u683c\u6709\u597d\u51e0\u4e2a,\u5e76\u975e\u4e00\u4e2a,\u6240\u4ee5\u5982\u679c\u6211\u60f3\u63d0\u53d6\u7b2c1\u30013\u6bb5\u7684\u6570\u636e,\u4f7f\u7528last\u00a0|\u00a0head\u00a0-3\u00a0|\u00a0cut\u00a0-d\u00a0‘\u00a0‘\u00a0-f\u00a01,3,\u6570\u636e\u7ed3\u679c\u5c31\u4e0d\u4f1a\u662f\u6211\u60f3\u8981\u7684.<\/p>\n","protected":false},"excerpt":{"rendered":"

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