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Full Discussion: Arithmetics in if else statement
Top Forums Shell Programming and Scripting Arithmetics in if else statement Post 302629297 by methyl on Tuesday 24th of April 2012 12:58:00 PM
Old 04-24-2012
First, let's learn how to set a variable to a value. We don't need echo and all that punctutation. Also,there is never a reason to end a line in Shell with a semi-colon. For readability while testing let's indent our code and build in some diagnostic echo statements:
Code:
READS1=45
READS2=100
READS3=$((2 * ${READS2}))
echo "READS1=${READS1}"
echo "READS2=${READS2}"
echo "READS3=${READS3}"
if [ ${READS1} -gt ${READS3} ]
then
     echo  "gleich"
else
     echo "ungleich"
fi

./scriptname
READS1=45
READS2=100
READS3=200
ungleich

Hmm. Doesn't German ungleich mean English unequal ?
Last edited by methyl; 04-24-2012 at 02:03 PM..
 

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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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