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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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"sections": [], "description_zh": "\u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var \u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0c psql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a => \\getenv home HOME => \\echo :home /home/postgres", "description_zh_html": "

psql \u547d\u4ee4 \\getenv psql_var env_var\u3002

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\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n

\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587\u3002

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psql \u547d\u4ee4 \\getenv psql_var env_var\u3002

\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u5b9a\u4e49

\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n

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=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n

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\n \u83b7\u53d6\u73af\u5883\u53d8\u91cf env_var \u7684\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9 psql \u53d8\u91cf psql_var\u3002\u5982\u679c env_var \u5728 psql \u8fdb\u7a0b\u7684\u73af\u5883\u4e2d\u672a\u5b9a\u4e49\uff0cpsql_var \u4e0d\u4f1a\u88ab\u6539\u53d8\u3002\u793a\u4f8b\uff1a\n

\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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\n=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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=> \\getenv home HOME\n=> \\echo :home\n/home/postgres\n
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