ksh passing to awk multiple dyanamic variables awk -v Post: 302706979

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Top Forums Shell Programming and Scripting ksh passing to awk multiple dyanamic variables awk -v Post 302706979 by highnthemnts on Thursday 27th of September 2012 08:08:00 PM

09-27-2012

Registered User

ksh passing to awk multiple dyanamic variables awk -v

Using ksh to call a function which has awk script embedded.
It parses a long two element list file, filled with text numbers (I want column 2, beginning no sooner than line 45, that's the only known thing) . It's unknown where to start or end the data collection, dynamic variables will be used.
ie, scan lines 45 - 20000 first pass. second pass, scan lines 104-1065,third pass scan 742-5954...

The script returns some maths: (max, min, and ::: not yet there: line numbers of max, min, block average). There are ~10,000 files to examine. would like to pass this back into an array or list variable

the $item file looks like this:
123456788,-111.2316547
123456789,-25.1234579
...

Problem: it needs to search run-time defined blocks of the file, ie, between lines r and j. I can't quite get this part to work:

it uses -v to capture the variables: awk -v rstart=$r -v jend
and tries to block it off this way: if ((NR >= $rstart) && (NR <= $jend)

Good news, the awk works if you: if ((NR >= 45) && (NR <= 1000))

Secondary issue: have the results populate an array or list that i can work with later in ksh.

Code:

function return_minmax_r_j
 {
 awk -v rstart=$r -v jend=$j 'function  max(x){i=-999;for(val in x){if(i<=x[val]){i=x[val];}}return  i;}function min(x){i=max(x);for(val in  x){if(i>x[val]){i=x[val];}}return i;}{FS=","}{if ((NR >= $rstart)  && (NR <= $jend))  a[$2]=$2;next}END{minimum=min(a);maximum=max(a);  print maximum minimum}' $item 
 }

Code:

#===MAIN===
 generate_file_name_array  #generates a list of file names

 for item in ${FILE_LIST_ARRAY[@]} 
                do 
                r=45
                j=2000  #these will be variables declared later.

                return_minmax_r_j
                done
 return

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LEARN ABOUT DEBIAN

rstart

RSTART(1)						      General Commands Manual							 RSTART(1)

NAME

       rstart - a sample implementation of a Remote Start client

SYNOPSIS

       rstart [-c context] [-g] [-l username] [-v] hostname command args ...

DESCRIPTION

       Rstart  is a simple implementation of a Remote Start client as defined in "A Flexible Remote Execution Protocol Based on rsh".  It uses rsh
       as its underlying remote execution mechanism.

OPTIONS

       -c context
	       This option specifies the context in which the command is to be run.  A context specifies a general environment the program  is	to
	       be run in.  The details of this environment are host-specific; the intent is that the client need not know how the environment must
	       be configured.  If omitted, the context defaults to X.  This should be suitable for running X programs from the	host's	"usual"  X
	       installation.

       -g      Interprets  command  as a generic command, as discussed in the protocol document.  This is intended to allow common applications to
	       be invoked without knowing what they are called on the remote system.  Currently, the only generic commands defined  are  Terminal,
	       LoadMonitor, ListContexts, and ListGenericCommands.

       -l username
	       This option is passed to the underlying rsh; it requests that the command be run as the specified user.

       -v      This option requests that rstart be verbose in its operation.  Without this option, rstart discards output from the remote's rstart
	       helper, and directs the rstart helper to detach the program from the rsh connection used to start it.  With this option,  responses
	       from the helper are displayed and the resulting program is not detached from the connection.

NOTES

       This is a trivial implementation.  Far more sophisticated implementations are possible and should be developed.

       Error handling is nonexistent.  Without -v, error reports from the remote are discarded silently.  With -v, error reports are displayed.

       The  $DISPLAY environment variable is passed.  If it starts with a colon, the local hostname is prepended.  The local domain name should be
       appended to unqualified host names, but isn't.

       The $SESSION_MANAGER environment variable should be passed, but isn't.

       X11 authority information is passed for the current display.

       ICE authority information should be passed, but isn't.  It isn't completely clear how rstart should select what ICE  authority  information
       to pass.

       Even  without  -v,  the sample rstart helper will leave a shell waiting for the program to complete.  This causes no real harm and consumes
       relatively few resources, but if it is undesirable it can be avoided by explicitly specifying the "exec" command to the shell, eg
       rstart somehost exec xterm
       This is obviously dependent on the command interpreter being used on the remote system; the example given will work for the  Bourne  and  C
       shells.

SEE ALSO

       rstartd(1), rsh(1), A Flexible Remote Execution Protocol Based on rsh

AUTHOR

       Jordan Brown, Quarterdeck Office Systems

X Version 11							   rstart 1.0.4 							 RSTART(1)