{"id":207089,"date":"2025-07-08T10:04:45","date_gmt":"2025-07-08T02:04:45","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207089\/"},"modified":"2025-07-08T10:04:45","modified_gmt":"2025-07-08T02:04:45","slug":"os-getenv-%e5%92%8c-os-lookupenv-%e4%b8%8d%e8%bf%94%e5%9b%9e-histfile%e3%80%81histsize-%e5%92%8c-savehist-%e7%9a%84%e5%80%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207089\/","title":{"rendered":"os.Getenv \u548c os.LookupEnv \u4e0d\u8fd4\u56de $HISTFILE\u3001$HISTSIZE \u548c $SAVEHIST \u7684\u503c"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> os.Getenv \u548c os.LookupEnv \u4e0d\u8fd4\u56de $HISTFILE\u3001$HISTSIZE \u548c $SAVEHIST \u7684\u503c<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-19 22:51:32<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300aos.Getenv \u548c os.LookupEnv \u4e0d\u8fd4\u56de $HISTFILE\u3001$HISTSIZE \u548c $SAVEHIST \u7684\u503c\u300b<\/span>\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3<\/span>\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6b63\u5728\u4f7f\u7528 zsh<\/code>\uff0c\u5e76\u4e14\u6211\u6b63\u5728\u5c1d\u8bd5\u8bbf\u95ee\u8fd9\u4e9b\u73af\u5883\u53d8\u91cf\uff1a<\/p>\n

$ echo $histfile\n\/home\/amir\/.zsh_history\n$ echo $histsize\n50000\n$ echo $savehist\n10000<\/pre>\n
\u4f46\u662f os.lookupenv<\/code> \u8fd4\u56de \"\"\uff0c\u5bf9\u4e8e\u6240\u6709\u4e09\u4e2a\u90fd\u8fd4\u56de false<\/code>\uff0c\u5e76\u4e14 os.getenv<\/code> \u81ea\u7136\u8fd4\u56de\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\uff1a<\/p>\n
package main\n\nimport (\n    \"fmt\"\n    \"os\"\n)\n\nfunc main() {\n    histfile, found := os.lookupenv(\"histfile\")\n    if found {\n        fmt.println(histfile)\n    } else {\n        fmt.println(\"$histfile not found\")\n    }\n\n    histsize, found := os.lookupenv(\"histsize\")\n    if found {\n        fmt.println(histsize)\n    } else {\n        fmt.println(\"$histsize not found\")\n    }\n\n    savehist, found := os.lookupenv(\"savehist\")\n    if found {\n        fmt.println(savehist)\n    } else {\n        fmt.println(\"$savehist not found\")\n    }\n}\n<\/pre>\n
$ go run main.go\n$histfile not found\n$histsize not found\n$savehist not found<\/pre>\n
\u73b0\u5728\uff0c\u5982\u679c\u6211 export<\/code> \u8fd9\u4e9b\u53d8\u91cf\u4f4d\u4e8e $home\/.zshrc<\/code> \u4e2d\uff1a<\/p>\n
$ grep -ie \"histfile|histsize|savehist\" $home\/.zshrc\nexport histfile=\"$home\/.zsh_history\"\nexport histsize=1000000\nexport savehist=1000000<\/pre>\n
\u7136\u540e\u5b83\u5c31\u53ef\u4ee5\u5de5\u4f5c\u5e76\u8fd4\u56de\u6b63\u786e\u7684\u503c\uff1a<\/p>\n
$ go run hyst.go\n\/home\/amir\/.zsh_history\n1000000\n1000000<\/pre>\n
\u5f53\u6211\u6ca1\u6709\u663e\u5f0f\u5bfc\u51fa\u8fd9\u4e9b\u53d8\u91cf\u65f6\uff0c$histsize<\/code> \u548c $savehist<\/code> \u7684\u503c\u4e0d\u540c\uff0c\u4f46\u5b83\u4eec\u4e0d\u4e3a\u7a7a\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48\u8fd9\u4e9b\u51fd\u6570\u4f1a\u4e3a\u8fd9\u4e9b\u53d8\u91cf\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u5462\uff1f<\/p>\n
 <\/p>\n
\u6b63\u786e\u7b54\u6848<\/h2>\n
 <\/p>\n
\u8fd9\u662f\u56e0\u4e3a $histfile<\/code>\u3001$histsize<\/code> \u548c $savehist<\/code> \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e0d\u662f\u73af\u5883\u53d8\u91cf\uff0c\u800c\u53ea\u662f\u7531 \u8bbe\u7f6e\u7684shell \u53d8\u91cf<\/em>\uff1a<\/p>\n
## history file configuration\n[ -z \"$histfile\" ] && histfile=\"$home\/.zsh_history\"\n[ \"$histsize\" -lt 50000 ] && histsize=50000\n[ \"$savehist\" -lt 10000 ] && savehist=10000\n<\/pre>\n
\u8fd9\u4e9b\u662f\u60a8\u5728 $home\/.zshrc<\/code> \u4e2d\u4f7f\u7528 export<\/code> \u4e4b\u524d\u4f7f\u7528 echo<\/code> \u65f6\u770b\u5230\u7684\u503c\u3002<\/p>\n
\u533a\u5206 \u5f88\u91cd\u8981\uff1a<\/p>\n
    \n
  • \n
    \u73af\u5883\u53d8\u91cf\u53ef\u4ee5\u5728\u5b50\u8fdb\u7a0b\u4e2d\u8bbf\u95ee\uff0c\u4f46 shell \u53d8\u91cf\u5219\u4e0d\u80fd\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u5730\u521b\u5efa\u5b50\u8fdb\u7a0b\u6765\u9a8c\u8bc1\u6b64\u8bed\u53e5\uff1a<\/p>\n
    $ # child processes don't inherit shell variables\n$ key=value; sh -c 'echo \"key=$key\"'\nkey=\n\n$ # they do, however, inherit environment variables\n$ export key=value; sh -c 'echo \"key=$key\"'\nkey=value\n<\/pre>\n<\/li>\n
  • \n
    \u4e3a\u4e86\u80fd\u591f\u5728\u5b50\u8fdb\u7a0b\u4e2d\u8bbf\u95ee shell \u53d8\u91cf\uff0c\u60a8\u53ef\u4ee5 export<\/code> \u5b83\uff0c\u5c31\u50cf\u60a8\u5728 $home\/.zshrc<\/code> \u4e2d\u6240\u505a\u7684\u90a3\u6837\uff1a<\/p>\n
    $ key=value; export key; sh -c 'echo \"key=$key\"'\nkey=value\n<\/pre>\n<\/li>\n<\/ul>\n
    \u73b0\u5728\uff0c\u8981\u67e5\u770b\u7279\u5b9a\u53d8\u91cf\u662f\u5426\u662f\u73af\u5883\u53d8\u91cf\uff0c\u60a8\u53ef\u4ee5\u76f4\u63a5\u68c0\u67e5 ironment \u53d8\u91cf\u5217\u8868\uff0c\u800c\u4e0d\u662f\u4f7f\u7528 echo<\/code>\u3002<\/p>\n
    $ env | grep -i \"shell\"; echo $?\nshell=\/usr\/bin\/zsh\n0\n<\/pre>\n
    \u6240\u4ee5$shell<\/code>\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u73af\u5883\u53d8\u91cf\u3002\u73b0\u5728\u67e5\u770b\u5386\u53f2\u53d8\u91cf\uff1a<\/p>\n
    $ env | grep -iE \"histfile|histsize|savehist\"; echo $?\n1\n<\/pre>\n
    \u9000\u51fa\u4ee3\u7801\u4e3a 1\uff0c\u8868\u793a\u672a\u80fd\u5728\u73af\u5883\u53d8\u91cf\u5217\u8868\u4e2d\u627e\u5230\u8fd9\u4e9b\u540d\u79f0\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u300aos.Getenv \u548c os.LookupEnv \u4e0d\u8fd4\u56de $HISTFILE\u3001$HISTSIZE \u548c $SAVEHIST \u7684\u503c\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207089","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207089","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207089"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207089\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}