{"id":159,"date":"2024-07-29T10:38:49","date_gmt":"2024-07-29T02:38:49","guid":{"rendered":"http:\/\/znl.pub\/?p=159"},"modified":"2024-07-29T10:38:49","modified_gmt":"2024-07-29T02:38:49","slug":"linux-%e4%bb%8e%e6%8c%87%e5%ae%9a%e5%ad%97%e7%ac%a6%e4%b8%b2%e4%b8%ad%e5%8f%96%e9%9a%8f%e6%9c%ba%e5%ad%97%e7%ac%a6%e4%b8%b2-random","status":"publish","type":"post","link":"https:\/\/znl.pub\/?p=159","title":{"rendered":"Linux \u4ece\u6307\u5b9a\u5b57\u7b26\u4e32\u4e2d\u53d6\u968f\u673a\u5b57\u7b26\u4e32-$RANDOM"},"content":{"rendered":"

\u4f7f\u7528\u53d8\u91cf $RANDOM \u4ece\u7ed9\u5b9a\u5b57\u7b26\u4e2d\u83b7\u53d6\u968f\u673a\u5b57\u7b26\u4e32<\/h2>\n

\u5148\u4e0a\u4ee3\u7801\uff1a<\/p>\n

#!\/bin\/bash\n\n# \u5b9a\u4e49\u540d\u5b57\u548c\u59d3\u6c0f\u6570\u7ec4\nfirst_names=(\"John\" \"Jane\" \"Michael\" \"Emily\" \"David\")\nlast_names=(\"Smith\" \"Doe\" \"Johnson\" \"Brown\" \"Green\")\n\n# \u751f\u6210\u968f\u673a\u7d22\u5f15\nfirst_index=$((RANDOM % ${#first_names[@]}))\nlast_index=$((RANDOM % ${#last_names[@]}))\n\n# \u8f93\u51fa\u968f\u673a\u59d3\u540d\necho \"Random name: ${first_names[$first_index]} ${last_names[$last_index]}\"<\/code><\/pre>\n
\u5173\u4e8eRANDOM\u8fd9\u4e2a\u7279\u6b8a\u53d8\u91cf<\/h2>\n
\u5728 Bash shell \u4e2d\uff0cRANDOM \u662f\u4e00\u4e2a\u9884\u5b9a\u4e49\u7684\u73af\u5883\u53d8\u91cf\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u4f2a\u968f\u673a\u6570\u751f\u6210\u5668\u7684\u529f\u80fd\u3002\u8fd9\u4e2a\u53d8\u91cf\u6bcf\u6b21\u88ab\u5f15\u7528\u65f6\u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2a\u4e0d\u540c\u7684\u6574\u6570\u503c\uff0c\u53ef\u4ee5\u7528\u6765\u751f\u6210\u968f\u673a\u6570\u6216\u8005\u7528\u4e8e\u5176\u4ed6\u9700\u8981\u968f\u673a\u6027\u7684\u573a\u5408\u3002<\/p>\n
\u4f7f\u7528\u65b9\u6cd5<\/h3>\n
\u83b7\u53d6\u968f\u673a\u6574\u6570:<\/strong>
\n\u4f60\u53ef\u4ee5\u76f4\u63a5\u5f15\u7528 RANDOM \u53d8\u91cf\u6765\u83b7\u53d6\u4e00\u4e2a\u4ecb\u4e8e 0 \u548c 32767 \u4e4b\u95f4\u7684\u968f\u673a\u6574\u6570\u3002\u4f8b\u5982:<\/p>\n
echo $RANDOM<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u4f1a\u8f93\u51fa\u4e00\u4e2a\u968f\u673a\u6570\u3002<\/p>\n
\u8bbe\u7f6e\u968f\u673a\u79cd\u5b50:<\/strong>
\n\u5982\u679c\u4f60\u60f3\u63a7\u5236\u968f\u673a\u6570\u7684\u5e8f\u5217\uff0c\u53ef\u4ee5\u901a\u8fc7\u7ed9 RANDOM \u53d8\u91cf\u8d4b\u503c\u7684\u65b9\u5f0f\u6765\u8bbe\u7f6e\u5176\u521d\u59cb\u503c\u3002\u4f8b\u5982:<\/p>\n
RANDOM=12345\necho $RANDOM\necho $RANDOM<\/code><\/pre>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u5c06\u8f93\u51fa\u4e24\u4e2a\u8fde\u7eed\u7684\u968f\u673a\u6570\uff0c\u7531\u4e8e\u6211\u4eec\u8bbe\u7f6e\u4e86 RANDOM \u7684\u521d\u59cb\u503c\uff0c\u8fd9\u4e24\u4e2a\u6570\u5c06\u603b\u662f\u76f8\u540c\u7684\u3002<\/p>\n
\u751f\u6210\u7279\u5b9a\u8303\u56f4\u5185\u7684\u968f\u673a\u6570:<\/strong>
\n\u4f60\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684\u6570\u5b66\u8fd0\u7b97\u6765\u751f\u6210\u6307\u5b9a\u8303\u56f4\u5185\u7684\u968f\u673a\u6570\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u751f\u6210\u4e00\u4e2a 0 \u5230 99 \u4e4b\u95f4\u7684\u968f\u673a\u6570\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a:<\/p>\n
echo $((RANDOM % 100))<\/code><\/pre>\n
\u8fd9\u91cc\u7684 % \u662f\u53d6\u6a21\u8fd0\u7b97\u7b26\uff0c\u5b83\u8fd4\u56de\u9664\u6cd5\u7684\u4f59\u6570\u3002<\/p>\n
\u751f\u6210\u968f\u673a\u5b57\u7b26\u4e32:<\/strong>
\n\u4f60\u8fd8\u53ef\u4ee5\u7ed3\u5408\u5176\u4ed6\u547d\u4ee4\u548c\u6280\u5de7\u6765\u751f\u6210\u968f\u673a\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u8981\u751f\u6210\u4e00\u4e2a\u7531\u5b57\u6bcd\u548c\u6570\u5b57\u7ec4\u6210\u7684\u968f\u673a\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528 tr \u548c fold \u547d\u4ee4:<\/p>\n
    echo $RANDOM | tr -dc 'a-zA-Z0-9' | fold -w 8 | head -n 1<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u9996\u5148\u5c06 RANDOM \u8f6c\u6362\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u901a\u8fc7 tr \u547d\u4ee4\u79fb\u9664\u6240\u6709\u975e\u5b57\u6bcd\u548c\u6570\u5b57\u5b57\u7b26\uff0c\u518d\u4f7f\u7528 fold \u6765\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u6210\u957f\u5ea6\u4e3a 8 \u7684\u90e8\u5206\uff0c\u6700\u540e\u4f7f\u7528 head \u6765\u9009\u62e9\u7b2c\u4e00\u4e2a\u90e8\u5206\u3002<\/p>\n
\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n
    \n
  1. RANDOM \u751f\u6210\u7684\u662f\u4f2a\u968f\u673a\u6570\uff0c\u4e0d\u662f\u771f\u6b63\u7684\u968f\u673a\u6570\u3002\u8fd9\u610f\u5473\u7740\u5982\u679c\u5728\u76f8\u540c\u7684\u73af\u5883\u4e2d\u91cd\u590d\u8fd0\u884c\u76f8\u540c\u7684\u547d\u4ee4\uff0c\u4f60\u5c06\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u968f\u673a\u5e8f\u5217\u3002<\/li>\n
  2. \u5982\u679c\u4f60\u9700\u8981\u66f4\u9ad8\u8d28\u91cf\u7684\u968f\u673a\u6570\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u5176\u4ed6\u5de5\u5177\uff0c\u5982 \/dev\/urandom \u6587\u4ef6\u6216\u4e13\u95e8\u7684\u968f\u673a\u6570\u751f\u6210\u5e93\u3002<\/li>\n
  3. RANDOM \u53d8\u91cf\u53ea\u80fd\u7528\u4e8e\u751f\u6210\u6574\u6570\uff0c\u800c\u4e14\u6700\u5927\u503c\u4e3a 32767\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
    \u4f7f\u7528\u53d8\u91cf $RANDOM \u4ece\u7ed9\u5b9a\u5b57\u7b26\u4e2d\u83b7\u53d6\u968f\u673a\u5b57\u7b26\u4e32 \u5148\u4e0a\u4ee3\u7801\uff1a #!\/bin\/bash # \u5b9a\u4e49\u540d\u5b57\u548c\u59d3\u6c0f\u6570…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,13,12],"tags":[],"class_list":["post-159","post","type-post","status-publish","format-standard","hentry","category-linux","category-linux-bash","category-linux-use"],"_links":{"self":[{"href":"https:\/\/znl.pub\/index.php?rest_route=\/wp\/v2\/posts\/159","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/znl.pub\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/znl.pub\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/znl.pub\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/znl.pub\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=159"}],"version-history":[{"count":1,"href":"https:\/\/znl.pub\/index.php?rest_route=\/wp\/v2\/posts\/159\/revisions"}],"predecessor-version":[{"id":160,"href":"https:\/\/znl.pub\/index.php?rest_route=\/wp\/v2\/posts\/159\/revisions\/160"}],"wp:attachment":[{"href":"https:\/\/znl.pub\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/znl.pub\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=159"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/znl.pub\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}