View a file with line numbers

grep -n ^ /path/to/file | less

November 9, 2011 — bashoneliners

grep ^ will match all lines in a file
grep -n will prefix each line of output with the line number within its input file

In some systems you might have to use egrep instead of grep.

text-processing file-viewing

grep less

cat -n /path/to/file | less

February 13, 2012 — openiduser28

Alternative one-liners