Set up another timezone in Linux

#make sure NTPDd runs on reboot so the clock is synchronized
chkconfig ntpd on


#modify clock file:
vi /etc/sysconfig/clock


#and put your zone there, e.g.:
#ZONE="America/New_York"
ZONE="Asia/Jerusalem"
#UTC=True
UTC=False



#backup previous 'localtime ' file

mv /etc/localtime /etc/localtime.original

# and create a link to the zone file you've selected:
ln -s /usr/share/zoneinfo/Asia/Jerusalem /etc/localtime

# now verify that 'date' shows teh desired timezone [Israeli time (IST)]
date

CMake Error when compiling on AWS AMI CentOs / Fedora / RedHat family

If you are getting this error

CMake Error at /usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.
  Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
  system variable OPENSSL_ROOT_DIR (missing: OPENSSL_LIBRARIES
  OPENSSL_INCLUDE_DIR) (Required is at least version "0.9.8")

it is because RedHat decided to pre-install [a stripped down version of] OpenSSL and you do not have the developers package there.

Try this:

rpm -qa | grep openssl

If you got only

openssl-1.0.1e-16.el6_5.4.x86_64

Install the development package which got the headers and the extras

sudo yum -y install openssl-devel

and then run cmake command again

SSH/SCP to a remote machine / AWS from a terminal with a security key

Both 'ssh' and 'scp' Linux/Unix commands got '-i' option which accepts a path to the key file, so the commands look this way:

ssh -i /path/to/my/key/file.pem user@111.222.333.444

scp -i /path/to/my/key/file.pem ./src_file.gz user@111.222.333.444:/tmp/destintation_file.gz