setter and getter functions for file manipulation with sed Post: 302602895

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Top Forums Shell Programming and Scripting setter and getter functions for file manipulation with sed Post 302602895 by Corona688 on Tuesday 28th of February 2012 04:39:27 PM

02-28-2012

Registered User

Quote:

Originally Posted by Toorop

First of all, thanks a lot.

Hopefully, there's no misunderstanding between us, since I still don't know why the original task is much easier.

// No comments.

No /* multi-line comments. */

No { code blocks. }

No "strings".

Your code only might work under very particular circumstances, can't tell code blocks apart from each other, and may edit the heck out of the comments by accident.

I can give you something to do a specific task easily. You wanted something general, and that's hard.

This is why I asked what you actually wanted to do, not what manner you wanted to accomplish it in. Replacing values is easy enough. Giving you 'getters' and 'setters' so you can replace in exactly the manner you think you should isn't.

---------- Post updated at 03:39 PM ---------- Previous update was at 02:59 PM ----------

I still can't handle multi-line comments, so you'd better hope the variable names never show up in comments. But:

Code:

#!/bin/bash
cp data data-backup

awk 'function get(N)
{
        split(LINE[VAR[N]], A);
        sub(/;$/, "", A[2]);
        return(A[2]);
}

function set(N,V)
{
        if(!VAR[N])
        {
                LINE[++C]=N "\t" V ";"
                VAR[N]=C;
        }
        else
        {
                $0=LINE[VAR[N]];
                $2=V ";"
                LINE[VAR[N]]=$0
        }
}

/{/ && LL       {       PP[++L]=VP;     VP=VP LL "."    }
/}/             {       VP=PP[L--];                     }

{       LL=$0;  NAME=""; VALUE="";      LINE[++C]=$0     }

(NF==2) && /;$/ {       VAR[VP $1]=NR   }

END {
        set("FoamFile.version", "3.0");
        set("newvalue", "slartibartfast");
        for(N=1; N<=C; N++)    print LINE[N];
}' data-backup > data

Edit the part in red to your heart's content.

Last edited by Corona688; 02-28-2012 at 05:11 PM..

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upslog

UPSLOG(8)							    NUT Manual								 UPSLOG(8)

NAME

       upslog - UPS status logger

SYNOPSIS

       upslog -h

       upslog [OPTIONS]

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.

       -f format
	   Monitor the UPS using this format string. Be sure to enclose format in quotes so your shell doesn't split it up. 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 battery.charge% %VAR input.voltage%
	   %VAR ups.load% [%VAR ups.status%] %VAR ups.temperature%
	   %VAR input.frequency%

       -i interval
	   Wait this many seconds between polls. This defaults to 30 seconds.

	   If you require tighter timing, you should write your own logger using the upsclient(3) library.

       -l logfile
	   Store the results in this file.

	   You can use "-" for stdout, but upslog will remain in the foreground.

       -s ups
	   Monitor this UPS. The format for this option is upsname[@hostname[:port]]. The default hostname is "localhost".

       -u username
	   If started as root, upsmon will setuid(2) to the user id associated with username for security.

	   If username is not defined, it will use the value that was compiled into the program. This defaults to "nobody", which is less than
	   ideal.

SERVICE DELAYS

       The interval value is merely the number given to sleep(3) 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.networkupstools.org/

Network UPS Tools						    05/21/2012								 UPSLOG(8)