Man Pages – Linux Manual Pages

difftime – calculate time difference
USAGE
#include <time.h>

double difftime(time_t time1, time_t time0);

DESCRIPTION
The difftime() function returns the number of seconds elapsed between
time time1 and time time0, represented as [...]

co – check out RCS revisions
USAGE
co [options] file …

DESCRIPTION
co retrieves a revision from each RCS file and stores it into the cor-
responding working file.

Pathnames matching an [...]