The adjust command can be used to change a bond angle (valence angle) or bond length. See also: angle, bond, rotation, Adjust Bonds, Adjust Bond Angles
Keywords can be truncated to unique strings and their case does not matter. An atom-spec indicates all bonds with both endpoints included.
Only one bond angle (keyword angle, synonyms bangle and bondangle) can be changed at a time, so exactly two bonds with one atom in common must be specified. The new-angle is given in degrees. The first bond specified defines which set of atoms should move as the valence angle is changed.
Any number of bond lengths (keyword length, synonyms blength and bondlength) can be changed in a single command to the same new-length in Å. The movingSide option indicates which set of atoms should move as the length of a bond is changed (default smaller).