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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.
watch is a command-line tool, part of the Linux procps and procps-ng packages, that runs the specified command repeatedly and displays the results on standard output so the user can watch it change over time. By default, the command is run every two seconds, although this is adjustable with the -n secs argument.
Previous Line Home: Top of file End: End of file F: Follow Mode (for expanding logs or pipes). Interrupt (or from v581 Ctrl+X [6]) to abort. g or < First Line G or > Last Line n G: Line n / text Forward Search for text . Text is interpreted as a regex. ? text Backward Search like / & text grep like filter n: Next Search Match N
Most implementations provide a command line utility, often called logger, as well as a software library, to send messages to the log. [14] To display and monitor the collected logs one needs to use a client application or access the log file directly on the system. The basic command line tools are tail and grep. The log servers can be ...
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 ...
Instruments shows a time line displaying any event occurring in the application, such as CPU activity variation, memory allocation, and network and file activity, together with graphs and statistics. Group of events are monitored by selecting specific instruments from: File Activity, Memory Allocations, Time Profiler, GPU activity etc.
For example, a file manager application can detect if some file has changed and can then update a displayed icon and/or filename. The FAM system consists of two parts: famd — the FAM Daemon, which provides notifications and listens for requests. Administrators can configure it by editing the file /etc/fam.conf; libfam — the interface to the ...
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 ...