We may require to print a certain section of text lines, based on conditions such as a range of line numbers, and a range matched by a start and end pattern. Let's see how to do it.
We can use utilities such as awk, grep, and sed to perform the printing of a section based on conditions. Still, I found awk to be the simplest one to understand. Let's do it using awk.
To print the lines of a text in a range of line numbers,
MtoN, use the following syntax:$ awk 'NR==M, NR==N' filenameOr, it can take the
stdininput as follows:$ cat filename | awk 'NR==M, NR==N'Replace
MandNwith numbers as follows:$ seq 100 | awk 'NR==4,NR==6' 4 5 6
To print the lines of a text in a section with
start_patternandend_pattern, use the following syntax:$ awk '/start_pattern/, /end _pattern/' filenameFor example:
$ cat section.txt line with pattern1 line with pattern2 line with pattern3 line end with pattern4 line with pattern5...