{"id":302,"date":"2021-12-31T16:22:46","date_gmt":"2021-12-31T08:22:46","guid":{"rendered":"https:\/\/program.snlcw.com\/?p=302"},"modified":"2021-12-31T16:24:01","modified_gmt":"2021-12-31T08:24:01","slug":"linux-shell-%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/program.snlcw.com\/302.html","title":{"rendered":"Linux Shell \u7b14\u8bb0"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/program.snlcw.com\/302.html\/#1_wait\" >1 wait<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/program.snlcw.com\/302.html\/#2_%E8%AE%BE%E9%99%B7%E9%98%B1%E6%8D%95%E6%8D%89_SIGTERM_%E4%BF%A1%E5%8F%B7\" >2 \u8bbe\u9677\u9631\u6355\u6349 SIGTERM \u4fe1\u53f7<\/a><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"1_wait\"><\/span>1 wait<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>wait\u662f\u7528\u6765\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\u7684\u6267\u884c\uff0c\u76f4\u81f3\u6307\u5b9a\u7684\u5b50\u8fdb\u7a0b\u6267\u884c\u7ed3\u675f\u540e\uff0c\u624d\u7ee7\u7eed\u6267\u884c\u3002\u8bf7\u770b\u4e0b\u9762\u7684\u6f14\u793a\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-theme=\"mootools\">#!\/bin\/bash\r\n\r\nset -e\r\n\r\n# wait\u547d\u4ee4\u53ef\u4ee5\u4f7f\u5f53\u524dshell\u8fdb\u7a0b\u6302\u8d77\uff0c\u7b49\u5f85\u6240\u6307\u5b9a\u7684\u7531\u5f53\u524dshell\u4ea7\u751f\u7684\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\uff0cwait\u547d\u4ee4\u624d\u8fd4\u56de\u3002wait\u547d\u4ee4\u7684\u53c2\u6570\u53ef\u4ee5\u662f\u8fdb\u7a0bID\u6216\u662fjob specification\u3002\r\nsleep 5 &amp;\r\nsleep 10 &amp;\r\necho '\u7b49\u5f85\u7b2c\u4e8c\u4e2a\u5b50\u8fdb\u7a0b\u7ed3\u675f'\r\nwait %2\r\necho 'Finished'\r\n\r\nsleep 5 &amp;\r\nsleep 10 &amp;\r\necho '\u7b49\u5f85\u6240\u6709\u5b50\u8fdb\u7a0b\u7ed3\u675f'\r\n# Bash shell\u8fd8\u6709\u4e00\u4e2a\u5185\u7f6e\u53d8\u91cf\uff1a$!\uff0c\u7528\u6765\u8bb0\u5f55\u6700\u540e\u4e00\u4e2a\u88ab\u521b\u5efa\u7684\u540e\u53f0\u8fdb\u7a0b\r\necho $!\r\nwait\r\necho '\u4e3b\u8fdb\u7a0b\u9000\u51fa'<\/pre>\n<p>sleep \u65f6\u65e0\u6cd5\u63a5\u6536\u5230 SIGTERM\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7 wait \u65b9\u5f0f\u5b9e\u73b0\u3002\u4e0b\u9762\u662f mongodb \u5bb9\u5668\u7684 entrypoint.sh\uff0cmongoDB\u542f\u52a8\u9700\u8981\u4e00\u5b9a\u65f6\u95f4\uff0c\u542f\u52a8\u5b8c\u6210\u540e\u6211\u4eec\u624d\u80fd\u8bbe\u7f6e\u526f\u672c\u96c6\uff0c\u7b49\u5f85\u542f\u52a8\u7684\u8fc7\u7a0b\u5c31\u7528\u4e86 sleep\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-theme=\"mootools\">#!\/bin\/bash\r\n\r\n_term() {\r\n  # \u6d4b\u8bd5\u8bf7\u6267\u884c docker stop &lt;containerId&gt;\uff0c\u4f1a\u53d1\u9001 SIGTERM \u4fe1\u53f7\r\n  echo \"&gt; mongod --shutdown --dbpath \/data\/db\"\r\n  mongod --shutdown --dbpath \/data\/db\r\n}\r\ntrap _term HUP INT QUIT TERM\r\n\r\nset -e\r\n\r\nset -- $@ --dbpath \/data\/db --bind_ip 0.0.0.0 --port 27017 --replSet rs --oplogSize 128\r\n\r\necho \"&gt;&gt;&gt; starting mongo...\"\r\nexec \"$@\" &amp;\r\nchild1=$!\r\n\r\n# \u8fd9\u91cc\u4f7f\u7528 wait \u8ba9 sleep \u540e\u53f0\u8fd0\u884c\uff0c\u4ee5\u4fbf\u5728 sleep \u65f6\u53ef\u4ee5\u63a5\u6536\u5230 SIGTERM \u4fe1\u53f7\u3002sleep \u524d\u53f0\u8fd0\u884c\uff0c\u8c03\u7528 docker stop \u662f\u63a5\u6536\u4e0d\u5230\u7684\u3002\r\n# \u8fd0\u884c\u901f\u5ea6\u6162\u7684\u673a\u5668\u9700\u8981\u66f4\u4e45\u7684 sleep\r\nsleep 30s &amp;\r\nchild2=$!\r\nwait $child2\r\n\r\necho \"&gt;&gt;&gt; set docker ip to replica set ...\"\r\n\r\n#ipAddr=$(cat \/etc\/hosts | grep `hostname` | awk '{print $1}')\r\n#echo '&gt;&gt;&gt; hostname:' $ipAddr\r\n\r\necho \"&gt;&gt;&gt; initiate replica set...\"\r\nmongo ${USR_LOCAL_BIN}\/script.js\r\necho \"&gt;&gt;&gt; initialization is finished.\"\r\n\r\nwait $child1<\/pre>\n<h1><span class=\"ez-toc-section\" id=\"2_%E8%AE%BE%E9%99%B7%E9%98%B1%E6%8D%95%E6%8D%89_SIGTERM_%E4%BF%A1%E5%8F%B7\"><\/span><span style=\"font-size: 24px;\">2 \u8bbe\u9677\u9631\u6355\u6349 SIGTERM \u4fe1\u53f7<\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>\u901a\u5e38trap\u90fd\u5728\u811a\u672c\u4e2d\u4f7f\u7528\uff0c\u4e3b\u8981\u67092\u79cd\u529f\u80fd\uff1a<br \/>\n(1)\u5ffd\u7565\u4fe1\u53f7\u3002\u5f53\u8fd0\u884c\u4e2d\u7684\u811a\u672c\u8fdb\u7a0b\u63a5\u6536\u5230\u67d0\u4fe1\u53f7\u65f6(\u4f8b\u5982\u8bef\u6309\u4e86CTRL+C)\uff0c\u53ef\u4ee5\u5c06\u5176\u5ffd\u7565\uff0c\u514d\u5f97\u811a\u672c\u6267\u884c\u5230\u4e00\u534a\u5c31\u88ab\u7ec8\u6b62\u3002<br \/>\n(2)\u6355\u6349\u5230\u4fe1\u53f7\u540e\u505a\u76f8\u5e94\u5904\u7406\u3002\u4e3b\u8981\u662f\u6e05\u7406\u4e00\u4e9b\u811a\u672c\u521b\u5efa\u7684\u4e34\u65f6\u6587\u4ef6\uff0c\u7136\u540e\u9000\u51fa\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-theme=\"mootools\">Signal       Value   Comment\r\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\r\nSIGHUP        1      \u7ec8\u6b62\u8fdb\u7a0b\uff0c\u7279\u522b\u662f\u7ec8\u7aef\u9000\u51fa\u65f6\uff0c\u6b64\u7ec8\u7aef\u5185\u7684\u8fdb\u7a0b\u90fd\u5c06\u88ab\u7ec8\u6b62\r\nSIGINT        2      \u4e2d\u65ad\u8fdb\u7a0b\uff0c\u51e0\u4e4e\u7b49\u540c\u4e8esigterm\uff0c\u4f1a\u5c3d\u53ef\u80fd\u7684\u91ca\u653e\u6267\u884cclean-up\uff0c\u91ca\u653e\u8d44\u6e90\uff0c\u4fdd\u5b58\u72b6\u6001\u7b49(CTRL+C)\r\nSIGQUIT       3      \u4ece\u952e\u76d8\u53d1\u51fa\u6740\u6b7b(\u7ec8\u6b62)\u8fdb\u7a0b\u7684\u4fe1\u53f7\r\n \r\nSIGKILL       9      \u5f3a\u5236\u6740\u6b7b\u8fdb\u7a0b\uff0c\u8be5\u4fe1\u53f7\u4e0d\u53ef\u88ab\u6355\u6349\u548c\u5ffd\u7565\uff0c\u8fdb\u7a0b\u6536\u5230\u8be5\u4fe1\u53f7\u540e\u4e0d\u4f1a\u6267\u884c\u4efb\u4f55clean-up\u884c\u4e3a\uff0c\u6240\u4ee5\u8d44\u6e90\u4e0d\u4f1a\u91ca\u653e\uff0c\u72b6\u6001\u4e0d\u4f1a\u4fdd\u5b58\r\nSIGTERM      15      \u6740\u6b7b(\u7ec8\u6b62)\u8fdb\u7a0b\uff0c\u51e0\u4e4e\u7b49\u540c\u4e8esigint\u4fe1\u53f7\uff0c\u4f1a\u5c3d\u53ef\u80fd\u7684\u91ca\u653e\u6267\u884cclean-up\uff0c\u91ca\u653e\u8d44\u6e90\uff0c\u4fdd\u5b58\u72b6\u6001\u7b49\r\n \r\nSIGSTOP      19      \u8be5\u4fe1\u53f7\u662f\u4e0d\u53ef\u88ab\u6355\u6349\u548c\u5ffd\u7565\u7684\u8fdb\u7a0b\u505c\u6b62\u4fe1\u606f\uff0c\u6536\u5230\u4fe1\u53f7\u540e\u4f1a\u8fdb\u5165stopped\u72b6\u6001\r\nSIGTSTP      20      \u8be5\u4fe1\u53f7\u662f\u53ef\u88ab\u5ffd\u7565\u7684\u8fdb\u7a0b\u505c\u6b62\u4fe1\u53f7(CTRL+Z)\r\n \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/pre>\n<pre>\u6bcf\u4e2a\u4fe1\u53f7\u5176\u771f\u5b9e\u540d\u79f0\u5e76\u975e\u662fSIGXXX\uff0c\u800c\u662f\u53bb\u9664SIG\u540e\u7684\u5355\u8bcd\uff0c\u6bcf\u4e2a\u4fe1\u53f7\u8fd8\u6709\u5176\u5bf9\u5e94\u7684\u6570\u503c\u4ee3\u53f7\uff0c\u5728\u4f7f\u7528\u4fe1\u53f7\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd93\u79cd\u65b9\u5f0f\u4e2d\u7684\u4efb\u4e00\u4e00\u79cd\u3002\u4f8b\u5982SIGHUP\uff0c\u5b83\u7684\u4fe1\u53f7\u540d\u79f0\u4e3aHUP\uff0c\u6570\u503c\u4ee3\u53f7\u4e3a1\u3002\r\n\u5728\u4e0a\u9762\u6240\u5217\u7684\u4fe1\u53f7\u5217\u8868\u4e2d\uff0cKILL\u548cSTOP\u8fd9\u4e24\u4e2a\u4fe1\u53f7\u65e0\u6cd5\u88ab\u6355\u6349\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5728\u8bbe\u7f6e\u4fe1\u53f7\u9677\u9631\u65f6\uff0c\u53ea\u4f1a\u8003\u8651HUP\u3001INT\u3001QUIT\u3001TERM\u8fd94\u4e2a\u4f1a\u7ec8\u6b62\u3001\u4e2d\u65ad\u8fdb\u7a0b\u7684\u4fe1\u53f7\u3002<\/pre>\n<ul>\n<li>SIGTERM<br \/>\n\u201ckill pid\u201d \u4f1a\u53d1\u9001SIGTERM\u5230\u8fdb\u7a0bpid.<br \/>\nThis is the termination signal sent by killcommand by default.<br \/>\n\u6b64\u8fdb\u7a0b\u53ef\u88ab\u6355\u83b7\u3002<\/li>\n<li>SIGINT<br \/>\n\u5728\u7ec8\u7aef\u4e2d\u6572\u5165interrupt key\uff08DELETE\u6216ctrl+c\uff09\u4f1a\u4ea7\u751fSIGINT\u4fe1\u53f7\u3002\u8fd9\u4e2a\u4fe1\u53f7\u4f1a\u88ab\u53d1\u9001\u5230\u8fdb\u7a0b(inforeground process group)\u3002\u5f53\u6211\u4eec\u60f3\u7ec8\u6b62\u4e00\u4e2a\u5931\u63a7\u7a0b\u5e8f\uff08runaway program\uff09,\u53ef\u4ee5\u53d1\u9001\u8fd9\u4e2a\u4fe1\u53f7\u3002\u7528\u4e8e\u7ed3\u675f\u524d\u53f0\u8fdb\u7a0b\u3002<\/li>\n<li>SIGKILL<br \/>\n\u201ckill -9 pid\u201d \u4f1a\u53d1\u9001SIGKILL\u5230\u8fdb\u7a0bpid.<\/li>\n<\/ul>\n<p>Linux\u4e0b\u67093\u4e2a\u7279\u6b8a\u7684\u8fdb\u7a0b\uff0cidle\u8fdb\u7a0b(PID = 0), init\u8fdb\u7a0b(PID = 1)\u548ckthreadd(PID = 2)<br \/>\n*init\u8fdb\u7a0b\u5b8c\u6210\u7cfb\u7edf\u7684\u521d\u59cb\u5316. \u662f\u7cfb\u7edf\u4e2d\u6240\u6709\u5176\u5b83\u7528\u6237\u8fdb\u7a0b\u7684\u7956\u5148\u8fdb\u7a0b\u3002\u4e3b\u8981\u4f5c\u7528\u662f\u5904\u7406\u50f5\u5c38\u8fdb\u7a0b\u3002\u5f53\u67d0\u4e2a\u7236\u8fdb\u7a0b\u6bd4\u5b50\u8fdb\u7a0b\u63d0\u524d\u6d88\u4ea1\u65f6\uff0c\u7236\u8fdb\u7a0b\u4f1a\u7ed9\u5b50\u8fdb\u7a0b\u91cd\u65b0\u5bfb\u627e\u201c\u517b\u7236\u8fdb\u7a0b\u201d\uff0c\u4e00\u822c\u5c31\u662f\u8fdb\u7a0b1\uff0c\u7531\u8fdb\u7a0b1\u8d1f\u8d23\u5904\u7406\u8be5\u5b50\u8fdb\u7a0b\u7684\u6d88\u4ea1\u3002<\/p>\n<p>\u4e0b\u9762\u770b\u4e2aDemo\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-theme=\"mootools\">#!\/bin\/bash \r\n\r\n_term() { \r\n  echo \"\u4e3b\u8fdb\u7a0b\u6355\u6349\u5230\u4e86\u7ec8\u6b62\u4fe1\u53f7,\u51c6\u5907\u5f3a\u5236kill\u5b50\u8fdb\u7a0b:\" $child\r\n  echo \"&gt;&gt;&gt; kill -9\" $child\r\n  kill -9 $child\r\n}\r\n\r\ntrap _term HUP INT QUIT TERM\r\n\r\necho \"Doing some initial work...\";\r\nsleep 300 &amp;\r\n\r\nchild=$! \r\necho '\u5b50\u8fdb\u7a0bID:' $child\r\n# \u5982\u679c\u6211\u4eec\u8fd9\u91cc\u4e0d\u8c03\u7528 wait\uff0c\u4e3b\u8fdb\u7a0b\u4f1a\u9000\u51fa\uff0c\u6b64\u65f6\u5b50\u8fdb\u7a0b\u4f1a\u5206\u914d\u7ed9 PID=1\u7684\u8fdb\u7a0b\uff0cPID\u4e3a1\u662f\u4e2a\u7279\u6b8a\u8fdb\u7a0b\uff0csleep\u6307\u5b9a\u65f6\u95f4\u540e\uff0c\u8fd9\u4e2a\u5b50\u8fdb\u7a0b\u4e5f\u5c06\u9500\u6bc1\r\nwait \"$child\"\r\necho '\u4e3b\u8fdb\u7a0b\u9000\u51fa'\r\n<!--\/codes_iframe--><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1 wait wait\u662f\u7528\u6765\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\u7684\u6267\u884c\uff0c\u76f4\u81f3\u6307\u5b9a\u7684\u5b50\u8fdb\u7a0b\u6267\u884c\u7ed3\u675f\u540e\uff0c\u624d\u7ee7\u7eed\u6267\u884c\u3002\u8bf7\u770b\u4e0b\u9762\u7684\u6f14\u793a\uff1a #!\u2026 <span class=\"read-more\"><a href=\"https:\/\/program.snlcw.com\/302.html\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-302","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/posts\/302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/comments?post=302"}],"version-history":[{"count":0,"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/posts\/302\/revisions"}],"wp:attachment":[{"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/media?parent=302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/categories?post=302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/program.snlcw.com\/wp-json\/wp\/v2\/tags?post=302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}