Check if tar and tar.gz is currupted or not

To test the gzip file is not corrupt:

gunzip -t file.tar.gz

To test the tar file inside is not corrupt:

gunzip -c file.tar.gz | tar t > /dev/null

Vncserver error Oracle Linux 6u3

Recently i encountred an error after tryinfg to start vncserver on Oracle linux 6 update 3:

/usr/bin/Xvnc: symbol lookup error: /usr/bin/Xvnc: undefined symbol: pixman_composite_trapezoids
/usr/bin/Xvnc: symbol lookup error: /usr/bin/Xvnc: undefined symbol: pixman_composite_trapezoids

Solution to this problem is to run and install:

yum install pixman pixman-devel libXfont

and the problem solved :)