nl
语法
nl [options] files
为文件里每一行加上行号。
参数
-b | --body-numbering=STYLE设定内容的编号方式，默认方式为t(只有非空白行才有编号)。-d | --section-delimiter=CC设定逻辑分隔符CC-f | --footer-number=SYTLE设定页脚的编号方式，默认方式为n-h | --header-number=STYLE设定页眉的编号方式，默认方式n-i | --line-increment=NUM设定每行行号增量值。-l | --join-blank-lines=NUM将指定的一组空行数标记为一行。当STYLE为a时有效。-n | --number-format=FORMAT按照FORMAT格式插入行号。-p | --no-renumber不重置每个部分的行号。-s | --number-separator=STRING在行号后添加STRING内容-v | --starting-line-number=NUMBER首行起始编号。-w | --number-width=NUMBER设定行号的左缩进宽度。--help显示帮助信息。--version显示版本。
STYLE可以定义为：
a全部编号，包括空白行。t只编号非空白行。n完全不编号。pREGEXP只有匹配正则表达式的行才编号。
Example
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nl LICENSE-2.0.txt一般表示行号，不包含空行。
root@3b4e07cd9fdd:/# nl LICENSE-2.0.txt 1 Apache License 2 Version 2.0, January 2004 3 http://www.apache.org/licenses/ 4 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 5 1. Definitions. 6 "License" shall mean the terms and conditions for use, reproduction, 7 and distribution as defined by Sections 1 through 9 of this document. 8 "Licensor" shall mean the copyright owner or entity authorized by 9 the copyright owner that is granting the License. 10 "Legal Entity" shall mean the union of the acting entity and all 11 other entities that control, are controlled by, or are under common 12 control with that entity. For the purposes of this definition, 13 "control" means (i) the power, direct or indirect, to cause the 14 direction or management of such entity, whether by contract or 15 otherwise, or (ii) ownership of fifty percent (50%) or more of the 16 outstanding shares, or (iii) beneficial ownership of such entity. 17 "You" (or "Your") shall mean an individual or Legal Entity 18 exercising permissions granted by this License. 19 "Source" form shall mean the preferred form for making modifications, 20 including but not limited to software source code, documentation 21 source, and configuration files. 22 "Object" form shall mean any form resulting from mechanical 23 transformation or translation of a Source form, including but 24 not limited to compiled object code, generated documentation, 25 and conversions to other media types. 26 "Work" shall mean the work of authorship, whether in Source or 27 Object form, made available under the License, as indicated by a 28 copyright notice that is included in or attached to the work 29 (an example is provided in the Appendix below). 30 "Derivative Works" shall mean any work, whether in Source or Object 31 form, that is based on (or derived from) the Work and for which the 32 editorial revisions, annotations, elaborations, or other modifications 33 represent, as a whole, an original work of authorship. For the purposes 34 of this License, Derivative Works shall not include works that remain 35 separable from, or merely link (or bind by name) to the interfaces of, 36 the Work and Derivative Works thereof. 37 "Contribution" shall mean any work of authorship, including 38 the original version of the Work and any modifications or additions 39 to that Work or Derivative Works thereof, that is intentionally 40 submitted to Licensor for inclusion in the Work by the copyright owner 41 or by an individual or Legal Entity authorized to submit on behalf of 42 the copyright owner. For the purposes of this definition, "submitted" 43 means any form of electronic, verbal, or written communication sent 44 to the Licensor or its representatives, including but not limited to 45 communication on electronic mailing lists, source code control systems, 46 and issue tracking systems that are managed by, or on behalf of, the 47 Licensor for the purpose of discussing and improving the Work, but 48 excluding communication that is conspicuously marked or otherwise 49 designated in writing by the copyright owner as "Not a Contribution." ... 140 9. Accepting Warranty or Additional Liability. While redistributing 141 the Work or Derivative Works thereof, You may choose to offer, 142 and charge a fee for, acceptance of support, warranty, indemnity, 143 or other liability obligations and/or rights consistent with this 144 License. However, in accepting such obligations, You may act only 145 on Your own behalf and on Your sole responsibility, not on behalf 146 of any other Contributor, and only if You agree to indemnify, 147 defend, and hold each Contributor harmless for any liability 148 incurred by, or claims asserted against, such Contributor by reason 149 of your accepting any such warranty or additional liability. 150 END OF TERMS AND CONDITIONS 151 APPENDIX: How to apply the Apache License to your work. 152 To apply the Apache License to your work, attach the following 153 boilerplate notice, with the fields enclosed by brackets "[]" 154 replaced with your own identifying information. (Don't include 155 the brackets!) The text should be enclosed in the appropriate 156 comment syntax for the file format. We also recommend that a 157 file or class name and description of purpose be included on the 158 same "printed page" as the copyright notice for easier 159 identification within third-party archives. 160 Copyright [yyyy] [name of copyright owner] 161 Licensed under the Apache License, Version 2.0 (the "License"); 162 you may not use this file except in compliance with the License. 163 You may obtain a copy of the License at 164 http://www.apache.org/licenses/LICENSE-2.0 165 Unless required by applicable law or agreed to in writing, software 166 distributed under the License is distributed on an "AS IS" BASIS, 167 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 168 See the License for the specific language governing permissions and 169 limitations under the License. -
nl -i 2 LICENSE-2.0.txt行号递增数为2.
root@3b4e07cd9fdd:/# nl -i 2 LICENSE-2.0.txt 1 Apache License 3 Version 2.0, January 2004 5 http://www.apache.org/licenses/ 7 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 9 1. Definitions. 11 "License" shall mean the terms and conditions for use, reproduction, 13 and distribution as defined by Sections 1 through 9 of this document. 15 "Licensor" shall mean the copyright owner or entity authorized by 17 the copyright owner that is granting the License. ... -
nl -b a test.txt标记所有行，包含空行。
root@3b4e07cd9fdd:/# nl -b a test.txt 1 line1 2 line2 3 4 5 6 7 line3 8 line4 -
nl -b a -l 4 test.txt将4行空行为一组标示为一行。
root@3b4e07cd9fdd:/# nl -b a -l 4 test.txt 1 line1 2 line2 3 4 line3 5 line4 -
nl -s ". " test.txt在行号后面添加
.root@3b4e07cd9fdd:/# nl -s ". " test.txt 1. line1 2. line2 3. line3 4. line4 -
nl -d "00" -b a test.txt分割内容标记。
root@3b4e07cd9fdd:/# nl -d "00" -b a test.txt 1 line1 2 line2 3 4 line3 line4 -
nl -v 3 test.txt设定起始标号。
root@3b4e07cd9fdd:/# nl -v 3 test.txt 3 line1 4 line2 5 00 6 line3 7 line4
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nl -w 20 test.txt设定标号的宽度。
root@3b4e07cd9fdd:/# nl -w 20 test.txt 1 line1 2 line2 3 00 4 line3 5 line4
