tr\u00a0\u7528\u6765\u4ece\u6807\u51c6\u8f93\u5165\u4e2d\u901a\u8fc7\u66ff\u6362\u6216\u5220\u9664\u64cd\u4f5c\u8fdb\u884c\u5b57\u7b26\u8f6c\u6362.tr\u4e3b\u8981\u7528\u4e8e\u5220\u9664\u6587\u4ef6\u4e2d\u63a7\u5236\u5b57\u7b26\u6216\u8fdb\u884c\u5b57\u7b26\u5728\u8f6c\u6362.\u4f7f\u7528tr\u65f6\u8981\u8f6c\u6362\u4e24\u4e2a\u5b57\u7b26\u4e32:\u5b57\u7b26\u4e321\u7528\u4e8e\u67e5\u8be2,\u5b57\u7b26\u4e322\u7528\u4e8e\u5904\u7406\u5404\u79cd\u8f6c\u6362.tr\u521a\u6267\u884c\u65f6,\u5b57\u7b26\u4e321\u4e2d\u5b57\u7b26\u88ab\u6620\u5c04\u5230\u5b57\u7b26\u4e322\u4e2d\u7684\u5b57\u7b26,\u7136\u540e\u8f6c\u6362\u64cd\u4f5c\u5f00\u59cb.<\/p>\n
\u8bed\u6cd5:<\/p>\n
tr\u00a0\u00a0[-cdst]\u00a0[SET1]\u00a0[SET2]\u00a0[>newfile]\u00a0[<file]<\/p>\n
\u53c2\u6570:<\/p>\n
-c\u00a0:\u00a0complement\u00a0\u7528SET2\u66ff\u6362SET1\u4e2d\u6ca1\u6709\u5305\u542b\u7684\u5b57\u7b26;<\/p>\n
-d\u00a0:\u00a0delete\u00a0\u5220\u9664\u4fe1\u606f\u5f53\u4e2d\u7684SET1\u8fd9\u4e2a\u5b57\u7b26\u4e32;<\/p>\n
-s\u00a0:\u00a0\u66ff\u6362\u6389\u91cd\u590d\u7684\u5b57\u7b26,\u53ea\u4fdd\u7559\u7b2c\u4e00\u4e2a,\u5373\u5c06\u91cd\u590d\u51fa\u73b0\u7684\u5b57\u7b26\u4e32\u538b\u7f29\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32;<\/p>\n
-t\u00a0:\u00a0truncate-set1,\u5c06SET1\u7528SET2\u8f6c\u6362,\u4e00\u822c\u7f3a\u7701\u503c\u4e3a-t;<\/p>\n
SET1\/2\u00a0:\u00a0\u5b57\u7b26\u96c6;<\/p>\n
>newfile\u00a0:\u6211\u4eec\u53ef\u4ee5\u5c06\u7ed3\u679c\u5bfc\u5165\u65b0\u7684\u6587\u4ef6\u4fdd\u5b58;<\/p>\n
<file\u00a0:\u00a0\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7<\u6765\u8bfb\u5165file;<\/p>\n
\u5b57\u7b26\u8303\u56f4:<\/p>\n
[a-z]\/[A-Z]\u00a0:\u00a0a-z\/A-Z\u5185\u7684\u5b57\u7b26\u7ec4\u6210\u7684\u5b57\u7b26\u4e32;<\/p>\n
[0-9]\u00a0:\u00a0\u6570\u5b57\u4e32;<\/p>\n
\\octal\u00a0:\u00a0\u4e00\u4e2a\u4e09\u4f4d\u6570\u7684\u516b\u8fdb\u5236\u6570,\u5bf9\u5e94\u6709\u6548\u7684ASCII\u5b57\u7b26;<\/p>\n
[0*n]\u00a0:\u00a0\u8868\u793a\u5b57\u7b260\u91cd\u590d\u51fa\u73b0\u6307\u5b9a\u6b21\u6570n,\u5982[0*2]\u5339\u914d00\u7684\u5b57\u7b26\u4e32;<\/p>\n
<\/p>\n
\u8303\u4f8b1:\u00a0\u00a0\u5c06\/etc\/passwd\u00a0\u4e2d\u7684\u5c0f\u5199\u5b57\u7b26\u53d8\u6210\u5927\u5199\u5b57\u7b26<\/p>\n
#\u00a0cat\u00a0\/etc\/passwd\u00a0|\u00a0tr\u00a0[a-z]\u00a0[A-Z]<\/p>\n
\u540c\u6837\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7<\u8bfb\u5165\/etc\/passwd,\u5982\u4e0b<\/p>\n
#tr\u00a0[a-z]\u00a0[A-Z]\u00a0<\u00a0\/etc\/passwd<\/p>\n
<\/p>\n
\u8303\u4f8b2:\u00a0\u5c06\/etc\/passwd\u00a0\u8f6c\u5b58\u6210dos\u65ad\u884c\u5230\/root\/passwd\u4e2d,\u518d\u5c06^M\u7b26\u53f7\u5220\u9664<\/p>\n
#\u00a0cp\u00a0\/etc\/passwd\u00a0\/root\/passwd\u00a0&&\u00a0unix2dos\u00a0\/root\/passwd<\/p>\n
cp:\u00a0overwrite\u00a0`\/root\/passwd’?\u00a0y<\/p>\n
unix2dos:\u00a0converting\u00a0file\u00a0\/root\/passwd\u00a0to\u00a0DOS\u00a0format\u00a0…<\/p>\n
#\u00a0file\u00a0\/etc\/passwd\u00a0\/root\/passwd<\/p>\n
\/etc\/passwd:\u00a0\u00a0ASCII\u00a0text<\/p>\n
\/root\/passwd:\u00a0ASCII\u00a0text,\u00a0with\u00a0CRLF\u00a0line\u00a0terminators<\/p>\n
\u8fd9\u91cc\u7275\u626f\u5230unix2dos\u00a0\u547d\u4ee4,\u53ef\u4ee5\u901a\u8fc7yum\u00a0-y\u00a0install\u00a0unix2dos\u76f4\u63a5\u5b89\u88c5.<\/p>\n
#\u00a0cat\u00a0\/root\/passwd\u00a0|\u00a0tr\u00a0-d\u00a0‘\\r’\u00a0>\u00a0\/root\/passwd.linux<\/p>\n
\u8fd9\u91cc\u7684\u201d\\r\u201d\u6307\u7684\u662fdos\u7684\u65ad\u884c\u5b57\u7b26<\/p>\n
#\u00a0ll\u00a0\/etc\/passwd\u00a0\/root\/passwd*<\/p>\n
-rw-r–r–.\u00a01\u00a0root\u00a0root\u00a0891\u00a0Apr\u00a0\u00a02\u00a006:01\u00a0\/etc\/passwd<\/p>\n
-rw-r–r–.\u00a01\u00a0root\u00a0root\u00a0911\u00a0Apr\u00a017\u00a010:46\u00a0\/root\/passwd<\/p>\n
-rw-r–r–.\u00a01\u00a0root\u00a0root\u00a0891\u00a0Apr\u00a017\u00a010:47\u00a0\/root\/passwd.linux<\/p>\n
\u5904\u7406\u8fc7\u540e,\u53d1\u73b0\u6587\u4ef6\u5927\u5c0f\u4e0e\u539f\u6765\u7684\/etc\/passwd\u5c31\u4e00\u81f4\u4e86.<\/p>\n
<\/p>\n
\u8303\u4f8b3:\u00a0\u5220\u9664\u7a7a\u767d\u884c<\/p>\n
\u5220\u9664\u7a7a\u767d\u884c\u5c31\u662f\u5220\u9664\u6362\u884c\u7b26\/n<\/p>\n
\u6ce8\u610f:\u8fd9\u4e9b\u7a7a\u767d\u884c\u4e0a\u53ea\u6709\u56de\u8f66\u7b26,\u6ca1\u6709\u7a7a\u683c\u7b26<\/p>\n
#\u00a0cat\u00a0test.txt<\/p>\n
I\u00a0lovve\u00a0linux!<\/p>\n
<\/p>\n
Hello\u00a0World!<\/p>\n
<\/p>\n
Shell\u00a0is\u00a0worthy\u00a0to\u00a0been\u00a0studied!<\/p>\n
\u8fd9\u91cc\u4f7f\u7528\u6362\u884c\u7b26\u7684\u8f6c\u4e49\u5b57\u7b26\\n<\/p>\n
\u6ce8\u610f:\u82e5\u7528-d,\u5219\u4f1a\u5220\u9664\u6240\u6709\u7684\u6362\u884c\u7b26,\u5982\u4e0b:<\/p>\n
#\u00a0cat\u00a0test.txt\u00a0|\u00a0tr\u00a0-d\u00a0[“\\n”]<\/p>\n
I\u00a0lovve\u00a0linux!Hello\u00a0World!Shell\u00a0is\u00a0worthy\u00a0to\u00a0been\u00a0studied!<\/p>\n
\u800c\u6b64\u5904\u7528-s\u5220\u9664\u591a\u4f59\u7684\u6362\u884c\u7b26\u5462,\u5982\u4e0b:<\/p>\n
[root@sqj2015\u00a0~]#\u00a0cat\u00a0test.txt\u00a0|\u00a0tr\u00a0-s\u00a0[“\\n”]<\/p>\n
I\u00a0lovve\u00a0linux!<\/p>\n
Hello\u00a0World!<\/p>\n
Shell\u00a0is\u00a0worthy\u00a0to\u00a0been\u00a0studied!<\/p>\n
<\/p>\n
\u8303\u4f8b4:\u5220\u9664\u6307\u5b9a\u7684\u5b57\u7b26<\/p>\n
#\u00a0cat\u00a0test.txt<\/p>\n
Monday\u00a01:00<\/p>\n
Tuessday\u00a02:00<\/p>\n
Wednesday\u00a03:00<\/p>\n
\u73b0\u5728\u8981\u5220\u9664\u5904\u7406\u661f\u671f\u4e4b\u5916\u7684\u6240\u6709\u5b57\u7b26<\/p>\n
-d\u4ee3\u8868\u5220\u9664,[0-9]\u4ee3\u8868\u6240\u6709\u7684\u6570\u5b57,[:\u00a0]\u4ee3\u8868\u5192\u53f7\u548c\u7a7a\u683c<\/p>\n
#\u00a0cat\u00a0test.txt\u00a0|\u00a0tr\u00a0-d\u00a0“[0-9][:\u00a0]”<\/p>\n
Monday<\/p>\n
Tuessday<\/p>\n
Wednesday<\/p>\n
<\/p>\n
\u8303\u4f8b5:\u00a0\u5229\u7528-c\u8fdb\u884c\u8865\u96c6\u7684\u66ff\u6362<\/p>\n
\u6709\u65f6\u5019\u5728\u6587\u672c\u4e2d\u6211\u4eec\u53ea\u77e5\u9053\u8981\u4fdd\u7559\u4e00\u4e9b\u5b57\u7b26,\u5176\u4ed6\u5b57\u7b26\u79cd\u7c7b\u7e41\u591a,\u5c31\u53ef\u4ee5\u4f7f\u7528\u8865\u96c6\u7684\u66ff\u6362<\/p>\n
#\u00a0cat\u00a0test.txt<\/p>\n
Monday\u00a01:00<\/p>\n
Tuessday\u00a02:00<\/p>\n
Wednesday\u00a03:00<\/p>\n
\u6211\u4eec\u53ea\u9700\u8981\u661f\u671f,\u5219\u601d\u8def\u5c31\u662f\u9664\u4e86\u5b57\u6bcd,\u5176\u4ed6\u7edf\u7edf\u66ff\u6362\u6389<\/p>\n
\u8fd9\u91cc,-c\u7528\u6362\u884c\u7b26\u66ff\u6362\u6389\u9664\u4e86\u5b57\u7b26\u5916\u7684\u6240\u6709\u5b57\u7b26,-s\u5220\u9664\u591a\u4f59\u7684\u6362\u884c\u7b26<\/p>\n
#\u00a0cat\u00a0test.txt\u00a0|\u00a0tr\u00a0-cs\u00a0“[a-z][A-Z]”\u00a0“\\n”<\/p>\n
Monday<\/p>\n
Tuessday<\/p>\n
Wednesday<\/p>\n","protected":false},"excerpt":{"rendered":"
tr\u00a0\u7528\u6765\u4ece\u6807\u51c6\u8f93\u5165\u4e2d\u901a\u8fc7\u66ff\u6362\u6216\u5220\u9664\u64cd\u4f5c\u8fdb\u884c\u5b57\u7b26\u8f6c\u6362.tr\u4e3b\u8981\u7528\u4e8e\u5220\u9664\u6587\u4ef6\u4e2d\u63a7\u5236\u5b57\u7b26\u6216\u8fdb\u884c\u5b57\u7b26\u5728\u8f6c\u6362.\u4f7f\u7528tr … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[49,5],"tags":[38,62,253],"class_list":["post-656","post","type-post","status-publish","format-standard","hentry","category-linux","category-jishu","tag-linux","tag-shell","tag-tr"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/656","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=656"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/656\/revisions"}],"predecessor-version":[{"id":657,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/656\/revisions\/657"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=656"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=656"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=656"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}