UNIX Tips -  2

Sponserd tips by Jawad Ahmed, and Hariprasad Badginchla

Situation: On the production environment having a huge size of file formed from various files located in sequence of folders, that need to transfer from Linux Box to Solaris Box. Normal ‘sftp’ command is consuming more than 2 hrs but only part of the file is transferred.

"Always make a backup" but in a wise way...

Disk Usage commands

Production environment is critical to perform. Every act that we perform double-check is best way.

1. Check the filessize after combining

2. check the transferred file is same size as source

        First find the combined file is correct or not. Verify this with

du –k  [path][.]

for Solaris boxes

 du –fk [path][.]

This will give you the size of each folder and also the sum of those folder content together.

If the disk usage by the files is equal to the combined file approximately same then it is fine otherwise troubleshooting the combine process.

cksum filename

num num filename

The first number indicates the number of blocks consumed for this file. The second number indicates the file size in bytes. Here the first number is significant because after transferring to the other boxes we need to verify the number of blocks received it should match with source side blocks.

 Compression commands

Secure copying from Linux box to Solaris Box.

scp –rf user@host:absolutepath destinationpath

-r option is for recursive properties

-f  to indicate that a file

Overall -rf will gives the same permissions which are assigned at source to the destination file too.

Another form of scp

 scp –rf sourcepath user@host:destinationAbsolutePath

When you are copying between the different remote machines but on to the same user then the command goes like this:

 scp –rf sourcepath @host:~/relativePath

There is no need of giving user name before @ symbol. You can use the relative path for the destinations. follow this trick save your time.

Conclusion

With my experiments found that SCP is much better in fastness than SFTP command.

The status of copying is clear with * bar shown below the scp command. It is also shows how much percentage copied to the target out of original size of the file. This will allow you to make wise decision on the transferring of the files.

  grep CLASSPATH wluser.log|awk -F":" '{for (i=1 ; i<=NF ; i++) print $i}'

http://www.pcnetcom.net/solaris.htm

Good link for Date formats in Unix/SHELL program which you need regularly.

http://www.cyberciti.biz/faq/linux-unix-formatting-dates-for-display/

http://linux.about.com/library/cmd/blcmdl1_du.htm

http://www.pcnetcom.net/solaris.htm

http://www.softpanorama.org/Solaris/solaris_tips.shtml