04-27-2013
Shell
Hello I would be grateful if I get some help for my homework.
1. The problem:
I need to write a supervisory program, for which is given a
directory name and a character string as parameters.
The program have to watch in half minutes the changes in files which names start with that string, and are located in the given directory its subdirectories too.
Under changes I mean :
if the files rights have changed
if the files last access time changed
if the files last modification time changed
I have to write these changes in a new file in this way:
(file name - change type - old value -> new value (date and time))
And finally in every 5 minutes I have screen the changes also on the monitor.
2.) shell script
3.) I'm not able to come up with a solution, I made the parameters-check and the delay with the sleep command, but I don't know how can I cut from ex. the outcomeing of stat command the dates and rights wich changes. I have to make a current database every time?
4.)Universitatea Babes Bolyai Facultatea de Matematica si Informatica, Cluj-Napoca,Romania,Robu Judit(the course is in Hungarian, so i figure it's useless to post a link here)
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LEARN ABOUT OPENDARWIN
sleep
SLEEP(1) BSD General Commands Manual SLEEP(1)
NAME
sleep -- suspend execution for an interval of time
SYNOPSIS
sleep seconds
DESCRIPTION
The sleep command suspends execution for a minimum of seconds.
If the sleep command receives a signal, it takes the standard action.
IMPLEMENTATION NOTES
The SIGALRM signal is not handled specially by this implementation.
The sleep command will accept and honor a non-integer number of specified seconds (with a '.' character as a decimal point). This is a non-
portable extension, and its use will nearly guarantee that a shell script will not execute properly on another system.
EXAMPLES
To schedule the execution of a command for x number seconds later (with csh(1)):
(sleep 1800; sh command_file >& errors)&
This incantation would wait a half hour before running the script command_file. (See the at(1) utility.)
To reiteratively run a command (with the csh(1)):
while (1)
if (! -r zzz.rawdata) then
sleep 300
else
foreach i (`ls *.rawdata`)
sleep 70
awk -f collapse_data $i >> results
end
break
endif
end
The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and
it would be nice to have another program start processing the files created by the first program as soon as it is finished (when zzz.rawdata
is created). The script checks every five minutes for the file zzz.rawdata, when the file is found, then another portion processing is done
courteously by sleeping for 70 seconds in between each awk job.
DIAGNOSTICS
The sleep utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
nanosleep(2), sleep(3)
STANDARDS
The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A sleep command appeared in Version 4 AT&T UNIX.
BSD
April 18, 1994 BSD