how to import linux command in shell script file as the value of a variable ?

I am using Fedora 10. If I write java -version in terminal, it g开发者_开发技巧ives me java version. I want to write a shell script file to check whether the java version is greater than 1.5. The main problem is that I donot know how to assign the value of java -version command as to a variable of shell script. How to create shell script file for that ?

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As answered above, you can use backticks or (if your keyboard doesn't have them) use the following format:

JAVA_VERSION=$(command)

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Use backticks:

JAVA_VERSION=`java-version`

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you should direct stderr to stdout

$ var=$(java -version 2>&1)
$ set -- $var
$ echo $3
"1.6.0_0"
$ echo ${3//[._\"]/}
1600

Now you can compare $ver to see if its greater than 1500.

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All the above Answer will work for you. below are the common example which you can use to get the value of variable:

JAVA_VERSION=`java-version` or JAVA_VERSION="java-version" or JAVA_VERSION=$(command)

The way is to set the value of variable is many. You can use your easiest way to fulfill your requirement. Like I'm using

var=$(awk -F'"' '/^variable=/ {print $2}' script1.sh )
echo $var