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Unix was the first operating system that was written in a high-level programming language (C Language).
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etime(3f) [bsd man page]

ETIME(3F)																 ETIME(3F)

NAME
etime, dtime - return elapsed execution time SYNOPSIS
function etime (tarray) real tarray(2) function dtime (tarray) real tarray(2) DESCRIPTION
These two routines return elapsed runtime in seconds for the calling process. Dtime returns the elapsed time since the last call to dtime, or the start of execution on the first call. The argument array returns user time in the first element and system time in the second element. The function value is the sum of user and system time. The resolution of all timing is 1/HZ sec. where HZ is currently 60. FILES
/usr/lib/libU77.a SEE ALSO
times(2) 4.2 Berkeley Distribution May 15, 1985 ETIME(3F)

Check Out this Related Man Page

TIME(3F)																  TIME(3F)

NAME
time, ctime, ltime, gmtime - return system time SYNOPSIS
integer function time() character*(*) function ctime (stime) integer stime subroutine ltime (stime, tarray) integer stime, tarray(9) subroutine gmtime (stime, tarray) integer stime, tarray(9) DESCRIPTION
Time returns the time since 00:00:00 GMT, Jan. 1, 1970, measured in seconds. This is the value of the UNIX system clock. Ctime converts a system time to a 24 character ASCII string. The format is described under ctime(3). No 'newline' or NULL will be included. Ltime and gmtime disect a UNIX time into month, day, etc., either for the local time zone or as GMT. The order and meaning of each element returned in tarray is described under ctime(3). FILES
/usr/lib/libU77.a SEE ALSO
ctime(3), itime(3F), idate(3F), fdate(3F) 4.2 Berkeley Distribution May 15, 1985 TIME(3F)

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