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tail has two special command line option -f and -F (follow) that allows a file to be monitored. Instead of just displaying the last few lines and exiting, tail displays the lines and then monitors the file. As new lines are added to the file by another process, tail updates the display. This is particularly useful for monitoring log files.
Typically, a new logfile is created periodically, and the old logfile is renamed by appending a "1" to the name. Each time a new log file is started, the numbers in the file names of old logfiles are increased by one, so the files "rotate" through the numbers (thus the name "log rotation").
How long a multimeasure rest must be before resorting to a horizontal line is a matter of personal taste or editorial policy; most publishers use ten bars as the changing point, however, larger and smaller changing points are used, especially in earlier music. [1] The number of bars for which a horizontal line multimeasure rest lasts is ...
A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.
A server log is a log file (or several files) automatically created and maintained by a server consisting of a list of activities it performed. A typical example is a web server log which maintains a history of page requests. The W3C maintains a standard format (the Common Log Format) for web server log files, but other proprietary formats ...
The system clock is typically implemented as a programmable interval timer that periodically interrupts the CPU, which then starts executing a timer interrupt service routine. This routine typically adds one tick to the system clock (a simple counter) and handles other periodic housekeeping tasks ( preemption , etc.) before returning to the ...
It formats and prints the contents of the last login log file, /var/log/lastlog (which is a usually a very sparse file), including the login name, port, and last login date and time. It is similar in functionality to the BSD program last , also included in Linux distributions; however, last parses a different binary database file ( /var/log ...
The original LRC format (sometimes called the Simple LRC format) is formed of two types of tags (time tags and optional ID tags), with one tag per line.Time tags have the format [mm:ss.xx]lyric, where mm is minutes, ss is seconds, xx is hundredths of a second, and lyric is the lyric to be played at that time.