{"id":514,"date":"2021-07-22T14:24:23","date_gmt":"2021-07-22T06:24:23","guid":{"rendered":"https:\/\/22pig.com\/?p=514"},"modified":"2021-07-22T14:24:23","modified_gmt":"2021-07-22T06:24:23","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3linux-shell%e4%b8%ad21%e7%9a%84%e5%90%ab%e4%b9%89","status":"publish","type":"post","link":"http:\/\/22pig.com\/?p=514","title":{"rendered":"\u6df1\u5165\u7406\u89e3Linux shell\u4e2d2>&1\u7684\u542b\u4e49"},"content":{"rendered":"

A.\u9996\u5148\u4e86\u89e3\u4e0b1\u548c2\u5728Linux\u4e2d\u4ee3\u8868\u4ec0\u4e48<\/strong><\/p>\n

\u5728Linux\u7cfb\u7edf\u4e2d0 1 2\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n

 <\/p>\n\n\n\n\n\n\n\n
\u540d\u79f0<\/th>\n\u4ee3\u7801<\/th>\n\u64cd\u4f5c\u7b26<\/th>\nJava\u4e2d\u8868\u793a<\/th>\nLinux \u4e0b\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08Debian \u4e3a\u4f8b)<\/th>\n<\/tr>\n<\/thead>\n
\u6807\u51c6\u8f93\u5165(stdin)<\/td>\n0<\/td>\n< \u6216 <<<\/td>\nSystem.in<\/td>\n\/dev\/stdin -> \/proc\/self\/fd\/0 -> \/dev\/pts\/0<\/td>\n<\/tr>\n
\u6807\u51c6\u8f93\u51fa(stdout)<\/td>\n1<\/td>\n>, >>, 1> \u6216 1>><\/td>\nSystem.out<\/td>\n\/dev\/stdout -> \/proc\/self\/fd\/1 -> \/dev\/pts\/0<\/td>\n<\/tr>\n
\u6807\u51c6\u9519\u8bef\u8f93\u51fa(stderr)<\/td>\n2<\/td>\n2> \u6216 2>><\/td>\nSystem.err<\/td>\n\/dev\/stderr -> \/proc\/self\/fd\/2 -> \/dev\/pts\/0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u4e0a\u9762\u8868\u683c\u5f15\u7528\u81ea\u8fd9\u91cc<\/a><\/p>\n

\u4ece\u4e0a\u8868\u770b\u7684\u51fa\u6765\uff0c\u6211\u4eec\u5e73\u65f6\u4f7f\u7528\u7684<\/p>\n

\n
\n
\n\n\n\n
\n
1<\/div>\n<\/td>\n
\n
\n
echo<\/code> \"hello\"<\/code> > t.log<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

\u5176\u5b9e\u4e5f\u53ef\u4ee5\u5199\u6210<\/p>\n

\n
\n
\n\n\n\n
\n
1<\/div>\n<\/td>\n
\n
\n
echo<\/code> \"hello\"<\/code> 1> t.log<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

B.\u5173\u4e8e2>&1\u7684\u542b\u4e49<\/strong><\/p>\n

\uff08\u5173\u4e8e\u8f93\u5165\/\u8f93\u51fa\u91cd\u5b9a\u5411\u672c\u6587\u5c31\u4e0d\u7ec6\u8bf4\u4e86\uff0c\u4e0d\u61c2\u7684\u53ef\u4ee5\u53c2\u8003\u8fd9\u91cc<\/a>\uff0c\u4e3b\u8981\u662f\u8981\u4e86\u89e3> < << >> <& >& \u8fd96\u4e2a\u7b26\u53f7\u7684\u4f7f\u7528\uff09<\/p>\n

1\u3001\u542b\u4e49\uff1a\u5c06\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa<\/p>\n

2\u3001\u7b26\u53f7>&\u662f\u4e00\u4e2a\u6574\u4f53\uff0c\u4e0d\u53ef\u5206\u5f00\uff0c\u5206\u5f00\u540e\u5c31\u4e0d\u662f\u4e0a\u8ff0\u542b\u4e49\u4e86\u3002
\n\u6bd4\u5982\u6709\u4e9b\u4eba\u53ef\u80fd\u4f1a\u8fd9\u4e48\u60f3\uff1a2\u662f\u6807\u51c6\u9519\u8bef\u8f93\u5165\uff0c1\u662f\u6807\u51c6\u8f93\u51fa\uff0c>\u662f\u91cd\u5b9a\u5411\u7b26\u53f7\uff0c\u90a3\u4e48”\u5c06\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa”\u662f\u4e0d\u662f\u5c31\u5e94\u8be5\u5199\u6210”2>1″\u5c31\u884c\u4e86\uff1f\u662f\u8fd9\u6837\u5417\uff1f
\n\u5982\u679c\u662f\u5c1d\u8bd5\u8fc7\uff0c\u4f60\u5c31\u77e5\u90532>1\u7684\u5199\u6cd5\u5176\u5b9e\u662f\u5c06\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u540d\u4e3a”1″\u7684\u6587\u4ef6\u91cc\u53bb\u4e86<\/p>\n

3\u3001\u5199\u62102&>1\u4e5f\u662f\u4e0d\u53ef\u4ee5\u7684<\/p>\n

C.\u4e3a\u4ec0\u4e482>&1\u8981\u653e\u5728\u540e\u9762<\/strong><\/p>\n

\u8003\u8651\u5982\u4e0b\u4e00\u6761shell\u547d\u4ee4<\/p>\n

\n
\n
\n\n\n\n
\n
1<\/div>\n<\/td>\n
\n
\n
nohup<\/code> java -jar app.jar >log 2>&1 &<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

(\u6700\u540e\u4e00\u4e2a&\u8868\u793a\u628a\u6761\u547d\u4ee4\u653e\u5230\u540e\u53f0\u6267\u884c\uff0c\u4e0d\u662f\u672c\u6587\u91cd\u70b9\uff0c\u4e0d\u61c2\u7684\u53ef\u4ee5\u81ea\u884cGoogle)<\/p>\n

\u4e3a\u4ec0\u4e482>&1\u4e00\u5b9a\u8981\u5199\u5230>log\u540e\u9762\uff0c\u624d\u8868\u793a\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u548c\u6807\u51c6\u8f93\u51fa\u90fd\u5b9a\u5411\u5230log\u4e2d\uff1f<\/p>\n

\u6211\u4eec\u4e0d\u59a8\u628a1\u548c2\u90fd\u7406\u89e3\u662f\u4e00\u4e2a\u6307\u9488,\u7136\u540e\u6765\u770b\u4e0a\u9762\u7684\u8bed\u53e5\u5c31\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n

    \n
  • \u672c\u67651—–>\u5c4f\u5e55 \uff081\u6307\u5411\u5c4f\u5e55\uff09<\/li>\n
  • \u6267\u884c>log\u540e\uff0c 1—–>log (1\u6307\u5411log)<\/li>\n
  • \u6267\u884c2>&1\u540e\uff0c 2—–>1 (2\u6307\u54111\uff0c\u800c1\u6307\u5411log,\u56e0\u6b642\u4e5f\u6307\u5411\u4e86log)<\/li>\n<\/ul>\n

    \u518d\u6765\u5206\u6790\u4e0b<\/p>\n

    \n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    nohup<\/code> java -jar app.jar 2>&1 >log &<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n
      \n
    1. \u672c\u67651—–>\u5c4f\u5e55 \uff081\u6307\u5411\u5c4f\u5e55\uff09<\/li>\n
    2. \u6267\u884c2>&1\u540e\uff0c 2—–>1 (2\u6307\u54111\uff0c\u800c1\u6307\u5411\u5c4f\u5e55,\u56e0\u6b642\u4e5f\u6307\u5411\u4e86\u5c4f\u5e55)<\/li>\n
    3. \u6267\u884c>log\u540e\uff0c 1—–>log (1\u6307\u5411log\uff0c2\u8fd8\u662f\u6307\u5411\u5c4f\u5e55)<\/li>\n<\/ol>\n

      \u6240\u4ee5\u8fd9\u5c31\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u7ed3\u679c\u3002<\/p>\n

      \u7b80\u5355\u505a\u4e2a\u8bd5\u9a8c\u6d4b\u8bd5\u4e0b\u4e0a\u9762\u7684\u60f3\u6cd5\uff1a<\/p>\n

      java\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

      \n
      \n
      \n\n\n\n
      \n
      1<\/div>\n
      2<\/div>\n
      3<\/div>\n
      4<\/div>\n
      5<\/div>\n
      6<\/div>\n<\/td>\n
      		\n
      \n
      public<\/code> class<\/code> Htest {<\/code><\/div>\n
      \u00a0<\/code>public<\/code> static<\/code> void<\/code> main(String[] args) {<\/code><\/div>\n
      \u00a0\u00a0<\/code>System.out.println(<\/code>\"out1\"<\/code>);<\/code><\/div>\n
      \u00a0\u00a0<\/code>System.err.println(<\/code>\"error1\"<\/code>);<\/code><\/div>\n
      \u00a0<\/code>}<\/code><\/div>\n
      }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

      javac\u7f16\u8bd1\u540e\u8fd0\u884c\u4e0b\u9762\u6307\u4ee4\uff1a<\/p>\n

      \n
      \n
      \n\n\n\n
      \n
      1<\/div>\n<\/td>\n
      		\n
      \n
      java Htest <\/code>2<\/code>>&<\/code>1<\/code> > log<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

      \u4f60\u4f1a\u5728\u7ec8\u7aef\u4e0a\u770b\u5230\u53ea\u8f93\u51fa\u4e86”error1″\uff0clog\u6587\u4ef6\u4e2d\u5219\u53ea\u6709”out1″<\/p>\n

      D.\u6bcf\u6b21\u90fd\u5199”>log 2>&1″\u592a\u9ebb\u70e6\uff0c\u80fd\u7b80\u5199\u5417\uff1f<\/strong><\/p>\n

      \u6709\u4ee5\u4e0b\u4e24\u79cd\u7b80\u5199\u65b9\u5f0f<\/p>\n

      \n
      \n
      \n\n\n\n
      \n
      1<\/div>\n
      2<\/div>\n<\/td>\n
      		\n
      \n
      &>log<\/code><\/div>\n
      >&log<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

      \u6bd4\u5982\u4e0a\u9762\u5c0f\u8282\u4e2d\u7684\u5199\u6cd5\u5c31\u53ef\u4ee5\u7b80\u5199\u4e3a\uff1a<\/p>\n

      \n
      \n
      \n\n\n\n
      \n
      1<\/div>\n<\/td>\n
      		\n
      \n
      nohup java -jar app.jar &>log &<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

      \u4e0a\u9762\u4e24\u79cd\u65b9\u5f0f\u90fd\u548c”>log 2>&1″\u4e00\u4e2a\u8bed\u4e49\u3002<\/p>\n

      \u90a3\u4e48 \u4e0a\u9762\u4e24\u79cd\u65b9\u5f0f\u4e2d&>\u548c>&\u6709\u533a\u522b\u5417\uff1f<\/p>\n

      \u8bed\u4e49\u4e0a\u662f\u6ca1\u6709\u4efb\u4f55\u533a\u522b\u7684\uff0c\u4f46\u662f\u7b2c\u4e00\u4e2d\u65b9\u5f0f\u662f\u6700\u4f73\u9009\u62e9\uff0c\u4e00\u822c\u4f7f\u7528\u7b2c\u4e00\u79cd<\/p>\n","protected":false},"excerpt":{"rendered":"

      A.\u9996\u5148\u4e86\u89e3\u4e0b1\u548c2\u5728Linux\u4e2d\u4ee3\u8868\u4ec0\u4e48 \u5728Linux\u7cfb\u7edf\u4e2d0 1 2\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26   \u540d\u79f0 \u4ee3\u7801 \u64cd\u4f5c\u7b26 Java\u4e2d\u8868\u793a Linux \u4e0b\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08Debian \u4e3a\u4f8b) \u6807\u51c6\u8f93\u5165(stdin) 0 < \u6216 << System.in \/dev\/stdin -> \/proc\/self\/fd\/0 -> \/dev\/pts\/0 \u6807\u51c6\u8f93\u51fa(stdout) 1 >, >>, 1> \u6216 1>> System.out \/dev\/stdout -> \/proc\/self\/fd\/1 -> \/dev\/pts\/0 \u6807\u51c6\u9519\u8bef\u8f93\u51fa(stderr) 2 2> \u6216 2>> System.err \/dev\/stderr -> \/proc\/self\/fd\/2 -> \/dev\/pts\/0   \u4e0a\u9762\u8868\u683c\u5f15\u7528\u81ea\u8fd9\u91cc \u4ece\u4e0a\u8868\u770b\u7684\u51fa\u6765\uff0c\u6211\u4eec\u5e73\u65f6\u4f7f\u7528\u7684 1 echo “hello” > t.log […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-514","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts\/514","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=514"}],"version-history":[{"count":0,"href":"http:\/\/22pig.com\/index.php?rest_route=\/wp\/v2\/posts\/514\/revisions"}],"wp:attachment":[{"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=514"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=514"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/22pig.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=514"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}