This is a very common task for a sysadmin, but sometimes people forgets how to do this job. Unices provides a large nuber of tools (often distributed under the GNU GPL license) to help sysadmins in their job.
Imagine you have a long text file (i.e. file.txt) and you want to extract 200 lines starting at line 18000.
1 Extracting a range of lines using sed
# sed -n 18000,18199p file.txt
the above command will printout lines in the range [18000, 18200], if you want, you can redirect the output to a new file
# sed -n 18000,18199p file.txt > result.txt
2 Extracting a range of lines using head/tail
head -18199 file.txt | tail -200 > result.txt
head -N prints the first N lines.
tail -N prints the last N lines.
3 Extracting a range of lines using awk
# awk 'NR>=18000 && NR<18200' file.txt > result.txt
4 Extracting a range of lines using perl
# perl -ne 'print if 18000..18200' file.txt > result.txt
5 Extracting a range of lines using perl
# vi file.txt