symbolic links in windows

junction - sysinternal tool for winxp and above

mlink - with vista and above

Find lines of code in your repository

        for ext in "*.java" "*.xml" "*.css" "*.jsp" "*.js" "*.sql"
        do
                echo -n "$ext,$location,"
                find ./$location -iname "$ext" -exec wc -l '{}' \;|gawk '{total+=$1} END{print total}'
        done

Passing Debug Parameters to JVM using Ant

Getting tablespace Size

SELECT tablespace_name,
       SUM (bytes) / 1024 / 1024 current_size,
       autoextensible,
       SUM (maxbytes) / 1024 / 1024 max_size
FROM dba_data_files
WHERE tablespace_name like '%'
GROUP BY tablespace_name, autoextensible
ORDER BY 1

bash : search and replace from previous command

tar -cvf sandeep.tar sandeep/

!!:gs/sandeep/singhal will mean

tar -cvf singhal.tar singhal/

:gs is for global search and replace

bash - last argument of the previous command (nth argument)

• Get the last argument of the previous command : !!$
• Get the first argumnet of the previous command : !!^
• Get the 1st argument of the previous command : !!1
• Get the nth argument of the previous command : !!n

Examples : 

$> ls :!!$  (or !$) 

$> ls :!!^

$> ls :!!2

$> ls :!!n

Trigger GC in eclipse.

This is a handy for eclipse which lets you to trigger gc in the eclipse instead of waiting for the jvm to schedule the GC .

Go to Window->Preferences->General, mark Show Heap status check box.
The current Heap usage with icon for "Run Garbage Collector" will appear at the bottom right.

It helps a lot in eclipse performance.

I find it pretty handy especially because I do not shutdown eclipse often.