{"id":648,"date":"2012-06-09T13:19:06","date_gmt":"2012-06-09T05:19:06","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=648"},"modified":"2016-03-10T13:19:44","modified_gmt":"2016-03-10T05:19:44","slug":"linux%e6%9f%a5%e7%9c%8b%e6%97%a5%e5%bf%97%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=648","title":{"rendered":"Linux\u67e5\u770b\u65e5\u5fd7\u547d\u4ee4"},"content":{"rendered":"

1\u3001cat\u547d\u4ee4\uff1a<\/strong><\/p>\n

\u529f\u80fd\uff1a<\/strong>1\uff09\u663e\u793a\u6574\u4e2a\u6587\u4ef6\u3002<\/p>\n

\u793a\u4f8b\uff1a $\u00a0cat fileName<\/p>\n

2\uff09\u628a\u6587\u4ef6\u4e32\u8fde\u63a5\u540e\u4f20\u5230\u57fa\u672c\u8f93\u51fa\uff0c\u5982\u5c06\u51e0\u4e2a\u6587\u4ef6\u5408\u5e76\u4e3a\u4e00\u4e2a\u6587\u4ef6\u6216\u8f93\u51fa\u5230\u5c4f\u5e55\u3002<\/p>\n

\u793a\u4f8b\uff1a $ cat file1 file2 > file<\/p>\n

\u8bf4\u660e\uff1a\u628a\u6863\u6848\u4e32\u8fde\u63a5\u540e\u4f20\u5230\u57fa\u672c\u8f93\u51fa(\u5c4f\u5e55\u6216\u52a0 > fileName \u5230\u53e6\u4e00\u4e2a\u6863\u6848)
\n\u00a0\u00a0\u00a0\u00a0 cat\u53c2\u6570\u8be6\u89e3\uff1a<\/strong>
\n-n \u6216 \u2013number \u7531 1 \u5f00\u59cb\u5bf9\u6240\u6709\u8f93\u51fa\u7684\u884c\u6570\u7f16\u53f7
\n-b \u6216 \u2013number-nonblank \u548c -n \u76f8\u4f3c\uff0c\u53ea\u4e0d\u8fc7\u5bf9\u4e8e\u7a7a\u767d\u884c\u4e0d\u7f16\u53f7
\n-s \u6216 \u2013squeeze-blank \u5f53\u9047\u5230\u6709\u8fde\u7eed\u4e24\u884c\u4ee5\u4e0a\u7684\u7a7a\u767d\u884c\uff0c\u5c31\u4ee3\u6362\u4e3a\u4e00\u884c\u7684\u7a7a\u767d\u884c
\n-v \u6216 \u2013show-nonprinting<\/p>\n

2\u3001more\u547d\u4ee4\uff1a<\/strong><\/p>\n

\u4ee5\u767e\u5206\u6bd4\u7684\u5f62\u5f0f\u67e5\u770b\u65e5\u5fd7\u3002<\/p>\n

 <\/p>\n

3\u3001less\u547d\u4ee4\uff1a<\/strong><\/p>\n

\u8ddfmore\u529f\u80fd\u5dee\u4e0d\u591a\uff0c\u53ea\u4e0d\u8fc7less\u652f\u6301\u524d\u540e\u7ffb\u9605\u6587\u4ef6\u3002<\/p>\n

 <\/p>\n

4\u3001head\u547d\u4ee4\uff1a<\/strong><\/p>\n

\u529f\u80fd\uff1a<\/strong>\u4ece\u6587\u672c\u6587\u4ef6\u7684\u5934\u90e8\u5f00\u59cb\u67e5\u770b\uff0chead \u547d\u4ee4\u7528\u4e8e\u67e5\u770b\u4e00\u4e2a\u6587\u672c\u6587\u4ef6\u7684\u5f00\u5934\u90e8\u5206\u3002<\/p>\n

\u793a\u4f8b\u5982\u4e0b\uff1a
\nhead example.txt \u663e\u793a\u6587\u4ef6 example.txt \u7684\u524d\u5341\u884c\u5185\u5bb9\uff1b
\nhead -n 20 example.txt \u663e\u793a\u6587\u4ef6 example.txt \u7684\u524d\u4e8c\u5341\u884c\u5185\u5bb9\uff1b
\nhead\u8be6\u89e3\uff1a<\/strong>
\n-n \u00a0\u00a0\u00a0 \u00a0\u6307\u5b9a\u4f60\u60f3\u8981\u663e\u793a\u6587\u672c\u591a\u5c11\u884c\u3002
\n-n number \u00a0\u00a0 \u00a0\u8fd9\u4e2a\u53c2\u6570\u9009\u9879\u5fc5\u987b\u662f\u5341\u8fdb\u5236\u7684\u6574\u6570\uff0c\u5b83\u5c06\u51b3\u5b9a\u5728\u6587\u4ef6\u4e2d\u7684\u4f4d\u7f6e\uff0c\u4ee5\u884c\u4e3a\u5355\u4f4d\u3002
\n-c number \u00a0\u00a0 \u00a0\u8fd9\u4e2a\u53c2\u6570\u9009\u9879\u5fc5\u987b\u662f\u5341\u8fdb\u5236\u7684\u6574\u6570\uff0c\u5b83\u5c06\u51b3\u5b9a\u5728\u6587\u4ef6\u4e2d\u7684\u4f4d\u7f6e\uff0c\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u3002<\/p>\n

5\u3001tail\u547d\u4ee4\uff1a<\/strong><\/p>\n

\u529f\u80fd\uff1a<\/strong>tail \u547d\u4ee4\u7528\u4e8e\u663e\u793a\u6587\u672c\u6587\u4ef6\u7684\u672b\u5c3e\u51e0\u884c\u3002<\/p>\n

\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n

tail example.txt \u663e\u793a\u6587\u4ef6 example.txt \u7684\u540e\u5341\u884c\u5185\u5bb9\uff1b
\ntail -n 20 example.txt \u663e\u793a\u6587\u4ef6 example.txt \u7684\u540e\u4e8c\u5341\u884c\u5185\u5bb9\uff1b
\ntail -f example.txt \u663e\u793a\u6587\u4ef6 example.txt \u7684\u540e\u5341\u884c\u5185\u5bb9\u5e76\u5728\u6587\u4ef6\u5185\u5bb9\u589e\u52a0\u540e\uff0c\u81ea\u52a8\u663e\u793a\u65b0\u589e\u7684\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n

tail -n 50 -f example.txt \u663e\u793a\u6587\u4ef6 example.txt \u7684\u540e50\u884c\u5185\u5bb9\u5e76\u5728\u6587\u4ef6\u5185\u5bb9\u589e\u52a0\u540e\uff0c\u81ea\u52a8\u663e\u793a\u65b0\u589e\u7684\u6587\u4ef6\u5185\u5bb9\u3002
\n\u6ce8\u610f\uff1a
\n\u6700\u540e\u4e00\u6761\u547d\u4ee4\u975e\u5e38\u6709\u7528\uff0c\u5c24\u5176\u5728\u76d1\u63a7\u65e5\u5fd7\u6587\u4ef6\u65f6\uff0c\u53ef\u4ee5\u5728\u5c4f\u5e55\u4e0a\u4e00\u76f4\u663e\u793a\u65b0\u589e\u7684\u65e5\u5fd7\u4fe1\u606f\u3002<\/p>\n

tail\u8be6\u89e3\uff1a
\n<\/strong>\u00a0\u00a0\u00a0\u00a0 -b Number \u4ece Number \u53d8\u91cf\u8868\u793a\u7684 512 \u5b57\u8282\u5757\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6307\u5b9a\u6587\u4ef6\u3002
\n-c Number \u4ece Number \u53d8\u91cf\u8868\u793a\u7684\u5b57\u8282\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6307\u5b9a\u6587\u4ef6\u3002
\n-f \u5982\u679c\u8f93\u5165\u6587\u4ef6\u662f\u5e38\u89c4\u6587\u4ef6\u6216\u5982\u679c File \u53c2\u6570\u6307\u5b9a FIFO\uff08\u5148\u8fdb\u5148\u51fa\uff09\uff0c
\n\u90a3\u4e48 tail \u547d\u4ee4\u4e0d\u4f1a\u5728\u590d\u5236\u4e86\u8f93\u5165\u6587\u4ef6\u7684\u6700\u540e\u7684\u6307\u5b9a\u5355\u5143\u540e\u7ec8\u6b62\uff0c\u800c\u662f\u7ee7\u7eed
\n\u4ece\u8f93\u5165\u6587\u4ef6\u8bfb\u53d6\u548c\u590d\u5236\u989d\u5916\u7684\u5355\u5143\uff08\u5f53\u8fd9\u4e9b\u5355\u5143\u53ef\u7528\u65f6\uff09\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a File \u53c2\u6570\uff0c
\n\u5e76\u4e14\u6807\u51c6\u8f93\u5165\u662f\u7ba1\u9053\uff0c\u5219\u4f1a\u5ffd\u7565 -f \u6807\u5fd7\u3002tail -f \u547d\u4ee4\u53ef\u7528\u4e8e\u76d1\u89c6\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u6b63\u5728\u5199\u5165\u7684\u6587\u4ef6\u7684\u589e\u957f\u3002
\n-k Number \u4ece Number \u53d8\u91cf\u8868\u793a\u7684 1KB \u5757\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6307\u5b9a\u6587\u4ef6\u3002
\n-m Number \u4ece Number \u53d8\u91cf\u8868\u793a\u7684\u591a\u5b57\u8282\u5b57\u7b26\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6307\u5b9a\u6587\u4ef6\u3002\u4f7f\u7528\u8be5\u6807\u5fd7\u63d0\u4f9b\u5728\u5355\u5b57\u8282\u548c\u53cc\u5b57\u8282\u5b57\u7b26\u4ee3\u7801\u96c6\u73af\u5883\u4e2d\u7684\u4e00\u81f4\u7ed3\u679c\u3002
\n-n Number \u4ece\u9996\u884c\u6216\u672b\u884c\u4f4d\u7f6e\u6765\u8bfb\u53d6\u6307\u5b9a\u6587\u4ef6\uff0c\u4f4d\u7f6e\u7531 Number \u53d8\u91cf\u7684\u7b26\u53f7\uff08+ \u6216 – \u6216\u65e0\uff09\u8868\u793a\uff0c\u5e76\u901a\u8fc7\u884c\u53f7 Number \u8fdb\u884c\u4f4d\u79fb\u3002
\n-r \u4ece\u6587\u4ef6\u672b\u5c3e\u4ee5\u9006\u5e8f\u65b9\u5f0f\u663e\u793a\u8f93\u51fa\u3002-r \u6807\u5fd7\u7684\u7f3a\u7701\u503c\u662f\u4ee5\u9006\u5e8f\u65b9\u5f0f\u663e\u793a\u6574\u4e2a\u6587\u4ef6\u3002\u5982\u679c\u6587\u4ef6\u5927\u4e8e 20,480 \u5b57\u8282\uff0c\u90a3\u4e48-r\u6807\u5fd7\u53ea\u663e\u793a\u6700\u540e\u7684 20,480 \u5b57\u8282\u3002 -r \u6807\u5fd7\u53ea\u6709
\n\u4e0e -n \u6807\u5fd7\u4e00\u8d77\u65f6\u624d\u6709\u6548\u3002\u5426\u5219\uff0c\u5c31\u4f1a\u5c06\u5176\u5ffd\u7565\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

1\u3001cat\u547d\u4ee4\uff1a \u529f\u80fd\uff1a1\uff09\u663e\u793a\u6574\u4e2a\u6587\u4ef6\u3002 \u793a\u4f8b\uff1a $\u00a0cat fileName 2\uff09\u628a\u6587\u4ef6\u4e32\u8fde\u63a5\u540e\u4f20\u5230\u57fa\u672c\u8f93 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[31],"tags":[334,337,322,32,335,336],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/648"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=648"}],"version-history":[{"count":0,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/648\/revisions"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}