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if test for higher value between 2 decimal numbers

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# 1  
Old 07-29-2011
if test for higher value between 2 decimal numbers
Hi
I would like to test for a max number value. It may be a decimal so I know I have to pipe into bc.
I just cannot get the syntax for this to work. I cannot get passed an error with the bracket - see below.
Any help appreciated.
Regards
Ewan




This works:

Code:
[ewan@sbc-san-01]/export/home/ewan> cat xx.ksh
#!/bin/sh
uname -a

max=6
val=3
if [ $max -gt $val ]
  then
    echo MAX $max VAL $val
  fi

Output:
=======
Code:
[ewan@sbc-san-01]/export/home/ewan> ./xx.ksh   
SunOS sbc-san-01 5.10 Generic_144488-12 sun4v sparc SUNW,SPARC-Enterprise-T5220
MAX 6 VAL 3





This fails:

Code:
[ewan@sbc-san-01]/export/home/ewan> cat ./xx.ksh
#!/bin/sh
uname -a

max=6
val=3
#if [ $max -gt $val ]
if [ $(echo "$max -gt $val" |bc) -eq 1 ]
  then
    echo MAX $max VAL $val
  fi

Output:
=======
Code:
[ewan@sbc-san-01]/export/home/ewan> ./xx.ksh    
SunOS sbc-san-01 5.10 Generic_144488-12 sun4v sparc SUNW,SPARC-Enterprise-T5220
./xx.ksh: syntax error at line 7: `(' unexpected

Last edited by pludi; 07-29-2011 at 08:52 AM..
# 2  
Old 07-29-2011
Code:
% max=3.11111; val=3.11101

% if [ $(echo "$max > $val" |bc) -eq 1 ]
then
echo MAX $max VAL $val
fi
MAX 3.11111 VAL 3.11101

Last edited by pludi; 07-29-2011 at 08:49 AM..
# 3  
Old 07-29-2011
And this is what I get:
Code:
[ewan@sbc-san-01]/export/home/ewan> cat ./xx.ksh
#!/bin/sh
uname -a

max=6.3
val=3.2
#if [ $max -gt $val ]
if [ $(echo "$max < $val" |bc) -eq 1 ]
  then
    echo MAX $max VAL $val
  fi


[ewan@sbc-san-01]/export/home/ewan> ./xx.ksh    
SunOS sbc-san-01 5.10 Generic_144488-12 sun4v sparc SUNW,SPARC-Enterprise-T5220
./xx.ksh: syntax error at line 7: `(' unexpected

What shell did you use, Yazu?

Moderator's Comments:
Mod Comment Please use [CODE] tags when posting source listings, command lines, ...
Last edited by pludi; 07-29-2011 at 08:53 AM..
# 4  
Old 07-29-2011
You have the shells mixed up. As far as I remember, /bin/sh is the original bourne shell on Solaris, which has less features than the Korn shell (ksh), including the $() function.
# 5  
Old 07-29-2011
zsh But $(...) is POSIX.
I'm sure pludi is right. You can use `echo ...` instead of $(...) in the original Bourne shell.
# 6  
Old 07-29-2011
I've tried ksh and sh below.
Ewan

Code:
#!/bin/ksh
uname -a

max=6.3
val=3.2
#if [ $max -gt $val ]
if [ `echo "$max < $val" |bc` -eq 1 ]
  then
    echo MAX $max VAL $val
  fi

output:
[ewan@sbc-san-01]/export/home/ewan> ./xx.ksh
SunOS sbc-san-01 5.10 Generic_144488-12 sun4v sparc SUNW,SPARC-Enterprise-T5220
syntax error on line 1, teletype
./xx.ksh[7]: test: argument expected


Code:
#!/bin/sh
uname -a

max=6.3
val=3.2
#if [ $max -gt $val ]
if [ `echo "$max < $val" |bc` -eq 1 ]
  then
    echo MAX $max VAL $val
  fi

output:
[ewan@sbc-san-01]/export/home/ewan> ./xx.sh
SunOS sbc-san-01 5.10 Generic_144488-12 sun4v sparc SUNW,SPARC-Enterprise-T5220
syntax error on line 1, teletype
./xx.sh: test: argument expected
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