You can use sed for this too -
sed -n '320123'p filename
This will print line number 320123.
If you want a range then you can do -
sed -n '320123,320150'p filename
If you want from a particular line to the very end then -
sed -n '320123,$'p filename
To open at a specific line straight from the command line, use:
less +320123 filename
If you want to see the line numbers too:
less +320123 -N filename
You can also choose to display a specific line of the file at a specific line of the terminal, for when you need a few lines of context. For example, this will open the file with line 320123 on the 10th line of the terminal:
less +320123 -j 10 filename
For editing this is possible in nano via +n from command line, e.g.,
nano +16 file.txt
To open file.txt to line 16.
From within less (in Linux):
g and the line number to go forward
G and the line number to go backwards
Used alone, g and G will take you to the first and last line in a file respectively; used with a number they are both equivalent.
An example; you want to go to line 320123 of a file,
press 'g' and after the colon type in the number 320123
Additionally you can type '-N' inside less to activate / deactivate the line numbers. You can as a matter of fact pass any command line switches from inside the program, such as -j or -N.
NOTE: You can provide the line number in the command line to start less (less +number -N) which will be much faster than doing it from inside the program:
less +12345 -N /var/log/hugelogfile
This will open a file displaying the line numbers and starting at line 12345
Source: man 1 less and built-in help in less (less 418)
Source: Stackoverflow.com