{"id":3712,"date":"2012-02-14T14:29:44","date_gmt":"2012-02-14T06:29:44","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=3712"},"modified":"2012-02-27T09:36:14","modified_gmt":"2012-02-27T01:36:14","slug":"echo%e5%92%8cbackslash","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/3712","title":{"rendered":"echo\u548cbackslash"},"content":{"rendered":"

echo\u547d\u4ee4\u662f\u4e00\u4e2a\u770b\u4f3c\u7b80\u5355\u7684\u547d\u4ee4\uff0c\u5f53\u5b83\u548c\u8f6c\u4e49\uff0c\u547d\u4ee4\u66ff\u6362\u7b49\u76f8\u9047\u65f6\uff0c\u5219\u4f1a\u53d1\u751f\u8bb8\u591a\u4ee4\u4eba\u8ff7\u60d1\u7684\u73b0\u8c61\u3002<\/p>\n

1.echo \\z\u548cecho “\\z”\u7684\u4e0d\u540c<\/strong><\/p>\n

echo\u547d\u4ee4\u6bd4\u8f83\u7279\u6b8a\uff0c\u5bf9\u4e8e\u5b83\u672c\u8eab\u800c\u8a00\uff0c\u8f6c\u4e49\u7b26\u52a0\u4e0a\u67d0\u4e9b\u5b57\u7b26\u4f1a\u5f15\u53d1\u4e00\u4e9b\u7279\u6b8a\u542b\u4e49\uff0c\u8fd9\u4e0e\u8f6c\u4e49\u672c\u8eab\u7684\u542b\u4e49\u53c8\u76f8\u53cd\u3002\u6bd4\u5982\\n\u5728echo\u4e2d\u8868\u793a\u56de\u8f66\u6362\u884c\uff0c\\t\u8868\u793a\u6c34\u5e73\u5236\u8868\u7b26\u7b49\u3002\u4e0d\u8fc7\uff0cecho\u547d\u4ee4\u5728bash\u4e2d\u9ed8\u8ba4\u662f\u4e0d\u5f00\u542f\u5bf9\u8fd9\u4e9b\u7279\u6b8a\u8f6c\u4e49\u7b26\u8fdb\u884c\u89e3\u91ca\u7684\uff0c\u5982\u679c\u8981\u5f00\u542f\u5219\u5fc5\u987b\u52a0\u4e0a-e\u9009\u9879\u3002
\n\u5bf9\u4e8e\u4e0b\u8ff0\u7684\u547d\u4ee4\uff1a<\/p>\n

$ echo -e \"\\\\thello\"\r\n\thello<\/pre>\n
\u5b83\u7684\u6267\u884c\u8fc7\u7a0b\u662f\uff1a<\/p>\n
1).”\\\\thello”\u9996\u5148\u88abbash\u89e3\u91ca\u4e3a”\\thello”\u3002<\/p>\n
2).”\\thello”\u4f5c\u4e3aecho\u7684\u53c2\u6570\uff0c\u7531\u4e8e\u52a0\u5165\u4e86-e\uff0c\u56e0\u6b64echo\u5c06\\t\u89e3\u91ca\u4e3a\u6c34\u5e73\u5236\u8868\u7b26\u3002<\/p>\n
3).\u663e\u793a\u7ed3\u679c\u3002<\/p>\n
\u4e0a\u8ff0\u547d\u4ee4\u53d1\u751f\u4e86\u4e24\u6b21\u8f6c\u4e49\uff0c\u7b2c\u4e00\u5373\u4e3a\u6267\u884c\u8fc7\u7a0b1\u4e2dbash\u5904\u7406\u547d\u4ee4\u884c\u65f6\uff0c\u7b2c\u4e8c\u6b21\u5373\u4e3a2\u4e2decho\u5904\u7406\u81ea\u8eab\u53c2\u6570\u65f6\u3002<\/p>\n
\u5bf9\u4e8e\u5f31\u5f15\u7528\u800c\u8a00\uff0c\u53cc\u5f15\u53f7\u4e2d\u7684\u6240\u6709\u5b57\u7b26\u90fd\u88ab\u5f53\u505a\u666e\u901a\u5b57\u7b26\uff0c\u9664\u4e86\\\uff0c$\u548c\u53cd\u5f15\u53f7\uff08\u672c\u6587\u6240\u8ff0\u7684\u53cd\u5f15\u53f7\u5c31\u4e3b\u952e\u76d8\u4e0a\u6570\u5b571\u5de6\u8fb9\u7684\u7b26\u53f7\uff09\u3002<\/p>\n
\u5728\u5bf9\u5b57\u7b26\u4e32\u4e0d\u52a0\u5f15\u7528\u7684\u60c5\u51b5\u4e0b\uff0c\\\u4f1a\u53d1\u6325\u5176\u8f6c\u4e49\u7684\u7279\u6027\uff0c\u5373\u663e\u793a\u5b57\u7b26\u5b57\u9762\u542b\u4e49\uff0c\u5373\u4fbf\u8be5\u5b57\u7b26\u662f\u666e\u901a\u5b57\u7b26\uff0c\u56e0\u6b64echo \\z\u7684\u7ed3\u679c\u4e3az\u3002\u800c\u53cc\u5f15\u53f7\u4e2d\u6240\u6709\u5b57\u7b26\u90fd\u88ab\u89e3\u91ca\u6210shell\u89e3\u91ca\u6210\u4e86\u666e\u901a\u5b57\u7b26\uff0c”\\z”\u88ab\u89e3\u91ca\u7684\u7ed3\u679c\u4e3a\\z\uff0c\u5e76\u4e14\\z\u5e76\u4e0d\u662fecho\u7684\u7279\u5b9a\u8f6c\u4e49\u7b26\u53f7\uff0c\u56e0\u6b64echo “\\z”\u7684\u7ed3\u679c\u4e3a\\z\u3002<\/p>\n
edsionte@edsionte-laptop:~\/mytest$ echo \\z\r\n+ echo z\r\nz\r\nedsionte@edsionte-laptop:~\/mytest$ echo \"\\z\"\r\n+ echo '\\z'\r\n\\z<\/pre>\n
\u8fd9\u91cc\u4f60\u4e5f\u8bb8\u6709\u7591\u95ee\uff1a\u5f31\u5f15\u7528\u662f\u4e0d\u80fd\u5173\u95ed$\uff0c\\\u548c\u53cd\u5f15\u53f7\u7684\u7279\u6b8a\u542b\u4e49\u7684\uff0c\u4e3a\u4f55echo “\\z”\u4e2d\u7684\\\u6ca1\u6709\u8d77\u5230\u8f6c\u4e49\u7684\u4f5c\u7528\u5462\uff1f<\/p>\n
\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f31\u5f15\u7528\u4e2d\\\u7b26\u53f7\u4ec5\u5bf9$\uff0c\\\uff0c\u53cd\u5f15\u53f7\u548c\u53cc\u5f15\u53f7\u8fd9\u51e0\u4e2a\u7279\u6b8a\u5b57\u7b26\u8d77\u8f6c\u4e49\u4f5c\u7528\uff0c\u800c\u5176\u4ed6\u5b57\u7b26\u524d\u7684\\\u5747\u4e0d\u8d77\u4f5c\u7528\uff0c\u4e5f\u5c31\u662f\u8bf4shell\u4f1a\u5ffd\u7565\u5b83\uff0c\u5c06\u8fd9\u4e2a\\\u4f5c\u4e3a\u666e\u901a\u5b57\u7b26\u3002<\/p>\n
edsionte@edsionte-laptop:~\/mytest$ t=a\r\n+ t=a\r\nedsionte@edsionte-laptop:~\/mytest$ echo \"\\$t\"\r\n+ echo '$t'\r\n$t\r\nedsionte@edsionte-laptop:~\/mytest$ echo \"\\*t\"\r\n+ echo '\\*t'\r\n\\*t<\/pre>\n
\u901a\u8fc7\u4e0a\u8ff0\u7684\u5206\u6790\uff0c\u4e5f\u5c31\u7b80\u5355\u89e3\u91ca\u4e86\u4e3a\u4f55echo \\z\u548cecho “\\z”\u4f1a\u6709\u4e0d\u540c\u7684\u7ed3\u679c\u3002<\/p>\n
2.echo `echo \\z`\u7684\u7591\u60d1<\/strong><\/p>\n
\u63a5\u4e0b\u6765\u8981\u8bf4\u660e\u7684\u4e0d\u662f\u4e0a\u8ff0\u4e00\u6761\u547d\u4ee4\uff0c\u800c\u662f\u5173\u4e8e\u5b83\u7684\u201c\u4e00\u7cfb\u5217\u201d\u547d\u4ee4\u3002<\/p>\n
$ cat test2echo.sh\r\n#!\/bin\/bash\r\n\r\necho `echo \\z`\r\necho `echo \\\\z`\r\necho `echo \\\\\\z`\r\necho `echo \\\\\\\\z`\r\necho `echo \\\\\\\\\\\\z`\r\necho `echo \\\\\\\\\\\\\\z`\r\n$ bash test2echo.sh\r\nz\r\nz\r\n\\z\r\n\\z\r\n\\z\r\n\\\\z<\/pre>\n
\u8fd9\u51e0\u6761echo\u547d\u4ee4\u4e2d\u5747\u5d4c\u5957\u4e86\u53e6\u4e00\u4e2aecho\u547d\u4ee4\uff0c\u547d\u4ee4\u66ff\u6362\u4f7f\u7528\u7684\u662f\u53cd\u5f15\u53f7\u800c\u4e0d\u662f$()\u3002\u4ece\u4e0a\u9762\u7684\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\u5f53echo\u9047\u5230\\\u65f6\u53d1\u751f\u4e86\u4e00\u4e9b\u5947\u602a\u7684\u73b0\u8c61\uff0c\u6bd4\u5982\u4e3a\u4f55\u7b2c3\uff0c4\uff0c5\u6761echo\u547d\u4ee4\u7684\u7ed3\u679c\u662f\u4e00\u81f4\u7684\u3002<\/p>\n
\u5728\u89e3\u91ca\u4e0a\u8ff0\u8fd9\u51e0\u4e2aecho\u547d\u4ee4\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u770b\u4e0b\u9762\u7684\u811a\u672c\uff1a<\/p>\n
$ cat testecho.sh\r\n#!\/bin\/bash\r\n\r\necho \\z\r\necho \\\\z\r\necho \\\\\\z\r\necho \\\\\\\\z\r\necho \\\\\\\\\\\\z\r\necho \\\\\\\\\\\\\\z\r\n$ bash testecho.sh\r\nz\r\n\\z\r\n\\z\r\n\\\\z\r\n\\\\\\z\r\n\\\\\\z<\/pre>\n
\u4e0a\u9762\u7684\u811a\u672c\u7684\u7ed3\u679c\u662f\u6bd4\u8f83\u5bb9\u6613\u60f3\u5230\u7684\u3002\u7b2c\u4e00\u6761echo\u4e2d\u7684\\\u7531\u4e8e\u5bf9z\u8fdb\u884c\u8f6c\u4e49\uff1b\u7b2c\u4e8c\u6761echo\u4e2d\u7684\u7b2c\u4e00\u4e2a\\\u5bf9\u7b2c\u4e8c\u4e2a\\\u8fdb\u884c\u8f6c\u4e49\uff1b\u7b2c\u4e09\u6761echo\u4e2d\u7684\u7b2c\u4e00\u4e2a\\\u5bf9\u7b2c\u4e8c\u4e2a\\\u8fdb\u884c\u8f6c\u4e49\uff0c\u7b2c\u4e09\u4e2a\\\u5bf9z\u8fdb\u884c\u8f6c\u4e49\uff1b\u540e\u7eed\u7684echo\u547d\u4ee4\u7684\u89c4\u5219\u90fd\u662f\u4e00\u81f4\u7684\u3002<\/p>\n
\u5982\u679c\u5c06testecho.sh\u4e2d\u7684\u7ed3\u679c\u4f5c\u4e3atest2echo.sh\u4e2d\u6bcf\u4e2a\u5185\u5c42echo\u7684\u8f93\u51fa\uff0c\u90a3\u4e48\u4f1a\u4e0d\u4f1a\u5f97\u5230test2echo.sh\u6700\u7ec8\u7684\u7ed3\u679c\u5462\uff1f\u6bd4\u5982echo `echo \\\\\\z`\uff0c\u5185\u90e8echo\u7684\u7ed3\u679c\u662f\\z\uff0c\u90a3\u4e48\u8fd9\u4e2a\u53cc\u5c42echo\u53ef\u4ee5\u770b\u4f5c\u662fecho \\z\u3002\u6309\u7167\u4e0a\u8ff01\u4e2d\u7684\u8ba8\u8bba\uff0c\u7ed3\u679c\u5e94\u8be5\u662fz\u3002\u770b\u6765\u5904\u7406\u8fc7\u7a0b\u5e76\u4e0d\u662f\u5982\u6b64\u3002<\/p>\n
\u90a3\u4e48echo `echo \\\\\\z`\u662f\u5426\u53ef\u4ee5\u770b\u4f5c\u662fecho “\\z”\uff1f\u6839\u636e\u4e0a\u8ff01\u4e2d\u7684\u8ba8\u8bba\u7ed3\u679c\uff0c\u7ed3\u679c\u6b63\u786e\u3002\u4e0d\u8fc7\u5bf9\u4e8eecho `echo \\\\\\\\z`\uff0c\u6309\u7167\u8fd9\u6837\u7684\u5904\u7406\u5e76\u4e0d\u6210\u7acb\u3002<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u4f7f\u7528set\u547d\u4ee4\u6765\u8ffd\u8e2atest2echo.sh\u7684\u6267\u884c\u8fc7\u7a0b\uff1a<\/p>\n
$ cat test2echo.sh\r\n#!\/bin\/bash\r\n\r\nset -x\r\n\r\necho `echo \\z`\r\necho `echo \\\\z`\r\necho `echo \\\\\\z`\r\necho `echo \\\\\\\\z`\r\necho `echo \\\\\\\\\\\\z`\r\necho `echo \\\\\\\\\\\\\\z`\r\n$ bash test2echo.sh\r\n++ echo z\r\n+ echo z\r\nz\r\n++ echo z\r\n+ echo z\r\nz\r\n++ echo '\\z'\r\n+ echo '\\z'\r\n\\z\r\n++ echo '\\z'\r\n+ echo '\\z'\r\n\\z\r\n++ echo '\\z'\r\n+ echo '\\z'\r\n\\z\r\n++ echo '\\\\z'\r\n+ echo '\\\\z'\r\n\\\\z<\/pre>\n
\u901a\u8fc7\u52a0\u5165-x\u9009\u9879\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u5185\u90e8echo\u7684\u8f93\u51fa\u7ed3\u679c\u88ab\u5355\u5f15\u53f7\u6240\u5f15\u7528\uff0c\u56e0\u6b64\u53ef\u4ee5\u5f97\u77e5\u4e0a\u8ff0\u53cc\u5c42echo\u547d\u4ee4\u7684\u7ed3\u679c\u90fd\u662f\u5185\u90e8echo\u7684\u8f93\u51fa\u7ed3\u679c\u3002\u56e0\u4e3a\u6bcf\u4e2a\u5185\u90e8echo\u7684\u8f93\u51fa\u90fd\u901a\u8fc7\u5355\u5f15\u53f7\u539f\u5c01\u4e0d\u52a8\u7684\u4f5c\u4e3a\u5916\u90e8echo\u7684\u8f93\u5165\uff0c\u5e76\u4e14\u5355\u5f15\u53f7\u4e2d\u7684\u6240\u6709\u5b57\u7b26\u90fd\u662f\u666e\u901a\u5b57\u7b26\uff08\u9664\u4e86\u5355\u5f15\u53f7\u672c\u8eab\uff09\u3002\u90a3\u4e48\u7a76\u7adf\u662f\u4ec0\u4e48\u539f\u56e0\u624d\u5bfc\u81f4\u8fd9\u6837\u4ee4\u4eba\u8ff7\u60d1\u7684\u7ed3\u679c\uff1f<\/p>\n
\u5728\u4e0a\u8ff0\u95ee\u98981\u4e2d\u6211\u4eec\u5df2\u7ecf\u8bf4\u660e\u8fc7\u53cc\u5f15\u53f7\u4e2d\\\u5bf9$\uff0c\u53cd\u5f15\u53f7\uff0c\u53cc\u5f15\u53f7\u548c\\\u8d77\u5230\u8f6c\u4e49\u4f5c\u7528\uff0c\u5373\u663e\u793a\u8fd9\u4e9b\u5b57\u7b26\u7684\u5b57\u9762\u610f\u601d\uff0c\u90a3\u4e48\u8fd9\u51e0\u4e2a\u7279\u6b8a\u5b57\u7b26\u524d\u7684\\\u4e5f\u5c06\u62bd\u79bb\u6240\u5728\u5b57\u7b26\u4e32\u3002\u540c\u6837\uff0c\u53cd\u5f15\u53f7\u4e2d\u4e5f\u5b58\u5728\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u5982\u679c\u53cd\u5f15\u53f7\u4e2d\u6709\\\uff0c\u5e76\u4e14\\\u540e\u7d27\u8ddf\u7684\u5b57\u7b26\u662f$\uff0c\u53cd\u5f15\u53f7\uff0c\u53cc\u5f15\u53f7\u548c\\\u8fd9\u4e9b\u5b57\u7b26\u65f6\uff0c\u90a3\u4e48\u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\u524d\u7684\\\u5c06\u62bd\u79bb\u3002<\/p>\n
\u6309\u7167\u4e0a\u8ff0\u7684\u89e3\u91ca\uff0ctest2echo.sh\u4e2d\u5404\u4e2aecho\u7684\u6267\u884c\u8fc7\u7a0b\u5c31\u660e\u4e86\u4e86\u3002\u4ee5echo `echo \\\\\\z`\u4e3a\u4f8b\uff0c\u5b83\u7684\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1).\\\\\\z\u7531\u4e8e\u53cd\u5f15\u53f7\u4e2d\u7684\\\u524d\u51fa\u73b0\u4e86\\\uff0c\u56e0\u6b64\u7b2c\u4e8c\u4e2a\\\u88ab\u62bd\u79bb\uff0c\u539f\u59cb\u547d\u4ee4\u6210\u4e3aecho `echo \\\\z`\u3002<\/p>\n
2).\u6267\u884c\u53cd\u5f15\u53f7\u4e2d\u7684echo\uff0c\u539f\u59cb\u547d\u4ee4\u6210\u4e3aecho \u2018\\z\u2019<\/p>\n
3).\u6267\u884c\u5916\u90e8echo\uff0c\u7ed3\u679c\u4e3a\\z\u3002<\/p>\n
\u518d\u4e3e\u4e00\u4f8b\uff0c\u6bd4\u5982\u4e0a\u8ff0\u7684echo `echo \\\\\\\\\\\\\\z`\uff0c\u5b83\u7684\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1).\u5185\u90e8\\\\\\\\\\\\\\z\u7531\u4e8e\u53cd\u5f15\u53f7\u4e2d\u7684\\\u524d\u53c8\u51fa\u73b0\u4e86\\\uff0c\u56e0\u6b64\u6709\u4e09\u4e2a\\\u88ab\u62bd\u79bb\uff0c\u539f\u59cb\u547d\u4ee4\u6210\u4e3aecho `echo \\\\\\\\z`\u3002<\/p>\n
2).\u6267\u884c\u53cd\u5f15\u53f7\u4e2d\u7684echo\uff0c\u539f\u59cb\u547d\u4ee4\u6210\u4e3aecho \u2018\\\\z\u2019<\/p>\n
3).\u6267\u884c\u5916\u90e8echo\uff0c\u7ed3\u679c\u4e3a\\\\z\u3002<\/p>\n
\u5176\u4ed6\u547d\u4ee4\u7684\u6267\u884c\u8fc7\u7a0b\u4e5f\u662f\u5982\u6b64\u3002\u6bcf\u4e2a\u547d\u4ee4\u4e2d\u7684\u53cd\u5f15\u53f7\u90e8\u5206\u90fd\u5148\u7ecf\u8fc7\\\u7684\u62bd\u79bb\uff0c\u63a5\u7740bash\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u8f6c\u79fb\u5904\u7406\uff0c\u518d\u8f93\u5165\u5185\u90e8echo\uff1b\u5185\u90e8echo\u5904\u7406\u5b8c\u6210\u540e\uff0c\u4f20\u9012\u7ed9\u5916\u90e8echo\uff0c\u6700\u7ec8\u8f93\u51fa\u7ed3\u679c\u3002\u4e0a\u8ff0\u8fc7\u7a0b\u4e2d\u76842)\u548c3)\u5747\u53ef\u4ee5\u901a\u8fc7set -x\u6765\u8ffd\u8e2a\u3002<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
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