What does line sed -n 1,100p /home/rsyslog/logs/test.log.2023-10-08 do

 The sed -n 1,100p /home/rsyslog/logs/audit.log.2023-10-08 command extracts lines 1 through 100 from the file /home/rsyslog/logs/audit.log.2023-10-08 and prints them to the standard output (typically the terminal or console). Here's a breakdown of the command:

sed: Invokes the sed command-line utility for text manipulation.

-n: Suppresses the default behavior of sed, which is to print every line. The -n option tells sed to operate in "quiet" mode, meaning it will only print lines explicitly specified in the script.

1,100p: Specifies the range of lines to be printed. In this case, it's lines 1 through 100. The p at the end of the range indicates that these lines should be printed.

/home/rsyslog/logs/audit.log.2023-10-08: Specifies the path to the input file from which lines are to be extracted.

So, when you run this command, it reads the file /home/rsyslog/logs/audit.log.2023-10-08 and prints lines 1 to 100 from that file to the standard output. This is useful for displaying a portion of a large log file or extracting specific lines for analysis.

references:

OpenAI