how to create a database

hi ,
i am encoutering the following error while trying to create a database ,
kindly provide the solution to this as soon as possible,
regards
ranjitha

bash-2.05$ createdb sat_demo1
/Program Files/Mercury Interactive/LoadRunner/bin/sed.exe: Unexpected End-of-file
psql: connectDBStart() -- connect() failed: No such file or directory
Is the postmaster running locally
and accepting connections on Unix socket '/tmp/.s.PGSQL.5432'?
createdb: database creation failed

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