{"id":26569,"date":"2023-04-13T09:06:15","date_gmt":"2022-12-05T22:00:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/ubuntu%e7%9a%84b-shell-5\/"},"modified":"2025-08-11T21:57:55","modified_gmt":"2025-08-11T13:57:55","slug":"ubuntu%e7%9a%84b-shell-5","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/ubuntu%e7%9a%84b-shell-5\/","title":{"rendered":"Ubuntu\u7684B Shell"},"content":{"rendered":"<h4>Ubuntu\u7684B Shell\u662f\u4e00\u4e2a\u6307\u5411dash shell\u7684\u7b26\u53f7\u94fe\u63a5\uff0c\u56e0\u6b64\u8981\u6ce8\u610fBash\u7684\u6269\u5c55\u53d8\u91cf\u5c55\u5f00\u4f1a\u5931\u8d25\u3002\u5982\u679c\u5c06shebang\u884c\u8bbe\u4e3a#!\/bin\/sh\uff0c\u5219\u4f1a\u53d1\u751f\u201cBad substitution\u201d\u9519\u8bef\u3002<\/h4>\n<pre class=\"post-pre\"><code>$ cat \/etc\/os-release\r\nNAME=\"Ubuntu\"\r\nVERSION=\"16.04.3 LTS (Xenial Xerus)\"\r\nID=ubuntu\r\nID_LIKE=debian\r\nPRETTY_NAME=\"Ubuntu 16.04.3 LTS\"\r\nVERSION_ID=\"16.04\"\r\nHOME_URL=\"http:\/\/www.ubuntu.com\/\"\r\nSUPPORT_URL=\"http:\/\/help.ubuntu.com\/\"\r\nBUG_REPORT_URL=\"http:\/\/bugs.launchpad.net\/ubuntu\/\"\r\nVERSION_CODENAME=xenial\r\nUBUNTU_CODENAME=xenial\r\n$ export LANG=C\r\n$ which sh\r\n\/bin\/sh\r\n$ ls -l \/bin\/sh\r\nlrwxrwxrwx 1 root root 4 May 11 14:15 \/bin\/sh -&gt; dash\r\n$ ls -l \/bin\/dash\r\n-rwxr-xr-x 1 root root 154072 Feb 18  2016 \/bin\/dash\r\n$ dash\r\n$ echo $SHELL\r\n\/bin\/bash\r\n$ test='ABCDEFG'\r\n$ echo $test\r\nABCDEFG\r\n$ echo ${test:2:3}    # Bash\u306e\u62e1\u5f35\u5909\u6570\u5c55\u958b\u306b\u5931\u6557; Bash\u306a\u3089\u3070 CDE \u3068\u8868\u793a\r\ndash: 12: Bad substitution\r\n<\/code><\/pre>\n<h4>\u5f53\u5c1d\u8bd5\u5c06\u6587\u672c\u6587\u4ef6\u52a0\u8f7d\u5230\u6570\u7ec4\u4e2d\u65f6\uff0c\u4e5f\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/h4>\n<pre class=\"post-pre\"><code>$ cat sports.sh\r\n#!\/bin\/sh\r\nsports=(`cat sports.txt`)\r\nfor sport in ${sports[@]}\r\ndo\r\n  echo $sport\r\ndone\r\nexit\r\n$ .\/sports.sh\r\n.\/sports.sh: 2: .\/sports.sh: Syntax error: \"(\" unexpected\r\n$ \/bin\/bash sports.sh\r\nsoccer\r\nbaseball\r\n...\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Ubuntu\u7684B Shell\u662f\u4e00\u4e2a\u6307\u5411dash shell\u7684\u7b26\u53f7\u94fe\u63a5\uff0c\u56e0\u6b64\u8981\u6ce8\u610fBash\u7684\u6269\u5c55\u53d8\u91cf\u5c55\u5f00\u4f1a\u5931\u8d25\u3002 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-26569","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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