{"id":1203,"date":"2022-02-25T07:54:47","date_gmt":"2022-02-25T07:54:47","guid":{"rendered":"http:\/\/www.liutianfeng.com\/?p=1203"},"modified":"2022-02-25T07:54:47","modified_gmt":"2022-02-25T07:54:47","slug":"bash%e4%b8%ad%e7%9a%84-s-z-e-f-d","status":"publish","type":"post","link":"https:\/\/www.liutianfeng.com\/?p=1203","title":{"rendered":"bash\u4e2d\u7684-s, -z, -e, -f, -d&#8230;"},"content":{"rendered":"<p>&nbsp;<\/p>\n<pre class=\"pure-highlightjs\"><code class=\"\">\u6761\u4ef6\u8868\u8fbe\u5f0f\u7528\u4e8e [[ \u590d\u5408\u547d\u4ee4\u4ee5\u53ca\u5185\u5efa\u547d\u4ee4 test \u548c [ \u4e2d\uff0c \u7528\u6765\u6d4b\u8bd5\u6587\u4ef6\u5c5e\u6027\uff0c\u8fdb\u884c\u5b57\u7b26\u4e32\u548c\u7b97\u672f\u6bd4\u8f83\u3002\u8868\u8fbe\u5f0f\u4f7f\u7528\u4e0b\u9762\u7684\u5355\u76ee\u6216\u4e8c\u8fdb\u5236\u64cd\u4f5c\u6784\u9020\u3002 \u5982\u679c\u67d0\u64cd\u4f5c\u7684\u4efb\u4f55 file \u53c2\u6570\u7684\u5f62\u5f0f\u662f\r\n\/dev\/fd\/n\uff0c\u90a3\u4e48\u5c06\u68c0\u67e5 \u6587\u4ef6\u63cf\u8ff0\u7b26 n\u3002\u5982\u679c\u67d0\u64cd\u4f5c\u7684 file \u53c2\u6570\u662f \/dev\/stdin\uff0c \/dev\/stdout \u6216\u8005 \/dev\/stderr \u4e4b\u4e00\uff0c\u5c06\u5206\u522b\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26 0\uff0c1 \u548c 2\u3002\r\n-a file\r\n\u5982\u679c file \u5b58\u5728\u5219\u4e3a\u771f\u3002\r\n-b file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u5757\u8bbe\u5907\u5219\u4e3a\u771f\u3002\r\n-c file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u5b57\u7b26\u8bbe\u5907\u5219\u4e3a\u771f\u3002\r\n-d file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u662f\u4e00\u4e2a\u76ee\u5f55\u5219\u4e3a\u771f\u3002\r\n-e file\r\n\u5982\u679c file \u5b58\u5728\u5219\u4e3a\u771f\u3002\r\n-f file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u666e\u901a\u6587\u4ef6\u5219\u4e3a\u771f\u3002\r\n-g file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u662f\u8bbe\u7f6e\u7ec4ID\u7684 (sgid) \u5219\u4e3a\u771f\u3002\r\n-h file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u7b26\u53f7\u94fe\u63a5\u5219\u4e3a\u771f\u3002\r\n-k file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u8bbe\u7f6e\u4e86 ``sticky'' \u4f4d (\u7c98\u6ede\u4f4d) \u5219\u4e3a\u771f\u3002\r\n-p file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u662f\u4e00\u4e2a\u547d\u540d\u7ba1\u9053 (FIFO) \u5219\u4e3a\u771f\u3002\r\n-r file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u53ef\u8bfb\u5219\u4e3a\u771f\u3002\r\n-s file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u5927\u5c0f\u5927\u4e8e\u96f6\u5219\u4e3a\u771f\u3002\r\n-t fd \u5982\u679c\u6587\u4ef6\u63cf\u8ff0\u7b26 fd \u662f\u6253\u5f00\u7684\u4e14\u5bf9\u5e94\u4e00\u4e2a\u7ec8\u7aef\u5219\u4e3a\u771f\u3002\r\n-u file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u662f\u8bbe\u7f6e\u7528\u6237ID\u7684 (suid) \u5219\u4e3a\u771f\u3002\r\n-w file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u53ef\u5199\u5219\u4e3a\u771f\u3002\r\n-x file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u53ef\u6267\u884c\u5219\u4e3a\u771f\u3002\r\n-O file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u6709\u6548\u7528\u6237ID\u6240\u62e5\u6709\u5219\u4e3a\u771f\u3002\r\n-G file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u6709\u6548\u7ec4ID\u6240\u62e5\u6709\u5219\u4e3a\u771f\u3002\r\n-L file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u7b26\u53f7\u94fe\u63a5\u5219\u4e3a\u771f\u3002\r\n-S file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e3a\u5957\u63a5\u5b57\u5219\u4e3a\u771f\u3002\r\n-N file\r\n\u5982\u679c file \u5b58\u5728\u4e14\u4e0a\u6b21\u8bfb\u53d6\u540e\u88ab\u4fee\u6539\u8fc7\u5219\u4e3a\u771f\u3002\r\nfile1 -nt file2\r\n\u5982\u679c file1 \u6bd4 file2 \u8981\u65b0 (\u6839\u636e\u4fee\u6539\u65e5\u671f)\uff0c\u6216\u8005 \u5982\u679c file1 \u5b58\u5728\u800c file2 \u4e0d\u5b58\u5728\uff0c\u5219\u4e3a\u771f\u3002\r\nfile1 -ot file2\r\n\u5982\u679c file1 \u6bd4 file2 \u66f4\u65e7\uff0c\u6216\u8005 \u5982\u679c file1 \u4e0d\u5b58\u5728\u800c file2 \u5b58\u5728\uff0c\u5219\u4e3a\u771f\u3002\r\nfile1 -ef file2\r\n\u5982\u679c file1 \u548c file2 \u6307\u7684\u662f\u76f8\u540c\u7684\u8bbe\u5907\u548c inode \u53f7\u5219\u4e3a\u771f\u3002\r\n-o optname\r\n\u5982\u679c\u542f\u7528\u4e86 shell \u9009\u9879 optname \u5219\u4e3a\u771f\u3002\u53c2\u89c1\u4e0b\u9762\u5bf9\u5185\u5efa\u547d\u4ee4 set \u7684 -o \u9009\u9879\u7684\u63cf\u8ff0\u4e2d\u7684\u9009\u9879\u5217\u8868\u3002\r\n-z string\r\n\u5982\u679c string \u7684\u957f\u5ea6\u4e3a 0 \u5219\u4e3a\u771f\u3002\r\n-n string\r\nstring \u5982\u679c string \u7684\u957f\u5ea6\u975e 0 \u5219\u4e3a\u771f\u3002\r\nstring1 == string2\r\n\u5982\u679c\u5b57\u7b26\u4e32\u76f8\u7b49\u5219\u4e3a\u771f\u3002= \u53ef\u4ee5\u7528\u4e8e\u4f7f\u7528 == \u7684\u573a\u5408\u6765\u517c\u5bb9 POSIX \u89c4\u8303\u3002\r\nstring1 != string2\r\n\u5982\u679c\u5b57\u7b26\u4e32\u4e0d\u76f8\u7b49\u5219\u4e3a\u771f\u3002\r\nstring1 &lt; string2\r\n\u5982\u679c string1 \u5728\u5f53\u524d\u8bed\u8a00\u73af\u5883\u7684\u5b57\u5178\u987a\u5e8f\u4e2d\u6392\u5728 string2 \u4e4b\u524d\u5219\u4e3a\u771f\u3002\r\nstring1 &gt; string2\r\n\u5982\u679c string1 \u5728\u5f53\u524d\u8bed\u8a00\u73af\u5883\u7684\u5b57\u5178\u987a\u5e8f\u4e2d\u6392\u5728 string2 \u4e4b\u540e\u5219\u4e3a\u771f\u3002<\/code><\/pre>\n<p>&nbsp;<\/p>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"https:\/\/www.liutianfeng.com\">liutianfeng.com<\/a> &raquo; <a href=\"https:\/\/www.liutianfeng.com\/?p=1203\">bash\u4e2d\u7684-s, -z, -e, -f, -d&#8230;<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>&nbsp; \u6761\u4ef6\u8868\u8fbe\u5f0f\u7528\u4e8e [[ \u590d\u5408\u547d\u4ee4\u4ee5\u53ca\u5185\u5efa\u547d\u4ee4 test \u548c [ \u4e2d\uff0c \u7528\u6765\u6d4b\u8bd5\u6587\u4ef6\u5c5e\u6027\uff0c\u8fdb\u884c\u5b57\u7b26\u4e32 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[31],"tags":[],"_links":{"self":[{"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/1203"}],"collection":[{"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1203"}],"version-history":[{"count":1,"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/1203\/revisions"}],"predecessor-version":[{"id":1204,"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/1203\/revisions\/1204"}],"wp:attachment":[{"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1203"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1203"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.liutianfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}