What's my JVM bitness? Post: 302535336

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Top Forums Shell Programming and Scripting What's my JVM bitness? Post 302535336 by radoulov on Thursday 30th of June 2011 12:06:56 PM

06-30-2011

Registered User

Quote:

Originally Posted by mohtashims

Hey that works !!

the output looks like

/apps/java/bin/rmiregistry is 32-bit
/apps/wls/bea10/jdk160_05/jre/bin/java is 32-bit
/apps/wls/bea10/jdk160_05/jre/bin/java is 32-bit
/apps/wls/bea10/jdk160_05/jre/bin/java is 32-bit

1) However, can you help me tweak your script to print respective PID next to each java.

This will print the pid:

Code:

pgrep -fl java |
  while read pid exe rest; do
    file "$exe" | 
      fgrep 64-bit &&
        printf '%d %s is 64-bit\n' $pid "$exe" ||
          printf '%d %s is 32-bit\n' $pid "$exe" 
done

Quote:

2) How can I get the java version for a particular PID which I wish to pass as a parameter input in $1

Code:

exe=$(
  ps -p$1 -oargs=
  )

file "$exe" |
  fgrep 64-bit &&
    echo 64-bit ||
      echo 32-bit

Quote:

3) Also, a small explanation of what each line does so I can play with it.

Regards,

ps/pgrep gets the arguments of the process, then execute file for the first argument(...), then grep 64-bit.

Something like this:

Code:

$ ps -p2081 -oargs=
/usr/j2se/bin/java -server -XX:+BackgroundCompilation -Xmx256m -Djava.security.
$ file /usr/j2se/bin/java
/usr/j2se/bin/java:     ELF 32-bit MSB executable SPARC Version 1, dynamically linked, stripped
$ file /usr/j2se/bin/java | fgrep 64-bit && echo 64 || echo 32
32

Notice that this will return 64 even if a 64-bit java executable is running with -d32 option enabled.

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