strace man

man pager

$ ls -al /usr/bin/pager
lrwxrwxrwx 1 root root 23 2009-08-18 17:30 /usr/bin/pager -> /etc/alternatives/pager
lrwxrwxrwx 1 root root 13 2009-08-18 17:19 /etc/alternatives/pager -> /usr/bin/less

"LESSCHARSET=utf-8",
"LESS=-ix8RmPm Manual page less(1) ?ltline %lt?L/%L.:byte %bB?s/%s..?e
(END):?pB %pB\%..$PM Manual page less(1) ?ltline %lt?L/%L.:byte %bB?s/%s..?e
(END):?pB %pB\%..$",