Need command or script to fetch only specific lines from a paragraph in a file in Unix/Linux

Question

Need command or script to fetch only specific paragraph from a file in Unix/Linux

Files formatting is like

=================================
THREAD NUMBER
MESSAGE NUMBER
Severity
File_LOCATION
FUNCTION_NAME
LINE_NUMBER
TIME STAMP
BLANK LINE
SINGLE LINE ERROR TEXT
=================================

Here i Want to extract only severity and message text part for user input severity.

Answer 1

Maybe you can use cat file | tail --lines=+3 | head -1 cat file | tail --lines=+3 | head -1 cat file | tail --lines=+3 | head -1 to get the third line out of the given file. But I don't know if this is what you want or need.

Answer 2

尝试这个：

awk "/Severity: $1/,/File_LOCATION/" < file_name > out.txt