02-29-2008
Using system calls
Hi,
I'm new to UNIX system calls. Can someone share your knowledge as to how exactly system calls should be executed?
Can they be typed like commands such as mkdir on the terminal itself? Also, are there any websites which will show me an example of the output to expect when a system call like open() is executed?
Thanks.
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LEARN ABOUT MOJAVE
lastcomm
LASTCOMM(1) BSD General Commands Manual LASTCOMM(1)
NAME
lastcomm -- show last commands executed in reverse order
SYNOPSIS
lastcomm [-f file] [command ...] [user ...] [terminal ...]
DESCRIPTION
lastcomm gives information on previously executed commands. With no arguments, lastcomm prints information about all the commands recorded
during the current accounting file's lifetime.
Option:
-f file Read from file rather than the default accounting file.
If called with arguments, only accounting entries with a matching command name, user name, or terminal name are printed. So, for example:
lastcomm a.out root ttyd0
would produce a listing of all the executions of commands named a.out by user root on the terminal ttyd0.
For each process entry, the following are printed.
o The name of the user who ran the process.
o Flags, as accumulated by the accounting facilities in the system.
o The command name under which the process was called.
o The amount of cpu time used by the process (in seconds).
o The time the process started.
o The elapsed time of the process.
The flags are encoded as follows: ``S'' indicates the command was executed by the super-user, ``F'' indicates the command ran after a fork,
but without a following exec(3), ``C'' indicates the command was run in PDP-11 compatibility mode (VAX only), ``D'' indicates the command
terminated with the generation of a core file, and ``X'' indicates the command was terminated with a signal.
FILES
/var/account/acct Default accounting file.
SEE ALSO
last(1), sigaction(2), acct(5), core(5)
HISTORY
The lastcomm command appeared in 3.0BSD.
BSD
December 22, 2006 BSD