shell script to execute in root mode

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http://unix.stackexchange.com – I need execute script that have commands which should be run in root mode. If I put sudo before command then when I run script I see permission denied ( I don't have a chance to write password). If I run script with sudo then it writes - command not found. If I put sudo su in the beginning of the script then after I inter password nothing happens. Script executes only when exit root mode. How can make such script? Thank you. (HowTos)