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Full Discussion: Echo not displaying variable in If-Else condition
Top Forums Shell Programming and Scripting Echo not displaying variable in If-Else condition Post 302771926 by Don Cragun on Friday 22nd of February 2013 06:59:30 AM
Old 02-22-2013
Quote:
Originally Posted by Chetanz
Thanks for quick replies

I am retriving it from a file which is in fact output of vmstat... eliminating header, awking a particular column values and then getting max of that to set x_oug
Code:
x_oug=`cat /u01/zopepx/vmstat1.txt|grep -v kthr|grep -v '-'|grep -v r|awk '{print x7}'|grep -Ev '(#.*$)|(^$)'|grep -v System|awk '{if($1>mx)mx=$1;}END{print mx}'`

Regards
Chetanz
I have no idea what you thought you should get out of this, but the awk in the middle of this pipeline (awk '{print x7}') prints an empty line for every line it reads. The two greps that follow that are no-ops, and the awk after that converts one or more empty lines into a single empty line. The ksh test -eq operator is intended to compare two numeric values. Since an empty string is not a numeric value, I'm not sure the results of the comparison are defined, but I expect that ksh will say that [ "" -eq 0 ] evaluates to false rather than giving a syntax error.
 

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LEARN ABOUT SUNOS

echo

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib 
       -R /usr/xpg4/lib -lcurses [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.10							    5 Jun 2002							    echo(3XCURSES)
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