How to use the Linux nl command
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1. Command Introduction nl (Number of Lines) adds line numbers to the specified file and writes it to standard output. If no file is specified or the specified file is "-", the program will read data from standard input. 2. Usage nl [options]... [file]... 3. Options : : : : : : : : : : : : : : : CC is the two delimiters used to separate logical page numbers. The missing second character implies ":". If you specify "\", Please enter "\\". The available styles are: a Number all lines t Number non-blank lines n Do not number lines pBRE Number only lines that match the regular expression BRE FORMAT is one of the following: ln Left-aligned, no spaces are filled with 0rn Right-aligned, no spaces are filled with 0rz Right-aligned, spaces are filled with 0 4. Examples Example 1: Display line numbers [root@oracledb study]# nl test1.log 1 2011 2 2012 3 2013 Example 2: Display line numbers and specify alignment [root@oracledb study]# nl -nln test1.log 1 2011 2 2012 3 2013 [root@oracledb study]# nl -nrn test1.log 1 2011 2 2012 3 2013 [root@oracledb study]# nl -nrz test1.log 000001 2011 000002 2012 000003 2013 Example 3: Specify a width of 4 bits and the default is 6 bits [root@oracledb study]# nl -nrz -w 4 test1.log 0001 2011 0002 2012 0003 2013 Example 4: Number the contents of standard input [root@oracledb study]# nl line1 1 line1 line2 2 line2 line3 3 line3 [root@oracledb study]# Press ctrl+D to end the input. or EOF（End Of File） [root@oracledb study]# nl <<EOF > line1 > line2 > line3 > EOF 1 line1 2 line2 3 line3 The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM. You may also be interested in:
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