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Top Forums Shell Programming and Scripting How to walk through a config file with /bin/sh Post 302347744 by zaxxon on Wednesday 26th of August 2009 10:01:05 AM
Old 08-26-2009
So if I understood it correct, you have problems with the substitution in the file.
If you have no problem to set up the while/read loop to get the wanted input, you can use the values stored in variables with for example sed to exchange the current values in the config file with the new ones.
Here a general example how substitute patterns:

Code:
# you got VAR filled with a value by your former read/while loop of course
sed "s/oldvalue/${VAR}/g"

Do this for several of your patterns and write it to a tmp file and maybe mv it over the original. Could take a backup before doing it.
 

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UPSLOG(8)						      Network UPS Tools (NUT)							 UPSLOG(8)

NAME
upslog - UPS status logger SYNOPSIS
upslog -h upslog ups logfile interval [format] DESCRIPTION
upslog is a daemon that will poll a UPS at periodic intervals, fetch the variables that interest you, format them, and write them to a file. The default format string includes variables that are supported by many common UPS models. See the description below to make your own. OPTIONS
-h Display the help message. ups Monitor this UPS. The format for this option is [upsname@]hostname[:port]. logfile Store the results in this file. You can use - for stdout, but upslog will remain in the foreground. interval Wait this many seconds between polls. Remember that a poll is not instantaneous, so it will slip back as the program runs. If you require tighter timing, you should write your own logger using the upsclient library. format The string to log, including variables from the UPS. Valid escapes within this string are: %% - insert a single % %TIME format% - insert the time with strftime formatting %ETIME% - insert the number of seconds, ala time_t. This is now a 10 digit number. %HOST% - insert the local hostname %UPSHOST% - insert the host of the UPS being monitored %PID% - insert the pid of upslog %VAR varname% - insert the value of variable varname The default format string is: %TIME @Y@m@d @H@M@S% %VAR battpct% %VAR utility% %VAR loadpct% [%VAR status%] %VAR upstemp% %VAR acfreq% SERVICE DELAYS
The interval value is merely the number given to sleep() after running through the format string. Therefore, a query will actually take slightly longer than the interval depending on the speed of your system. LOG ROTATION
upslog writes its pid to upslog.pid, and will reopen the log file if you send it a SIGHUP. This allows it to keep running when the log is rotated by an external program. SEE ALSO
Server: upsd(8) Clients: upsc(8), upscmd(8), upsrw(8), upsmon(8) Internet resources: The NUT (Network UPS Tools) home page: http://www.exploits.org/nut/ NUT mailing list archives and information: http://lists.exploits.org/ Wed Oct 16 2002 UPSLOG(8)
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