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The following two commands are probably the most usefulwill get you started:
Defining clusters (see FSL guide)
[datauser@localhost temp]$ cluster -i L_Hipp_vertexMNI_rand_tstat1.nii.gz -t 2 -o cluster_index --osize=cluster_size {optional: > cluster_info.txt}
This will create two nifti files as shown below with values at any location above the threshold (2 in the example), one with the cluster index starting at 1 (cluster_index.nii,gz) and one with the cluster size in voxels (cluster_size.nii.gz). The list of clusters will be displayed in the command window, unless the option "pipe" (>) to text file is used, in which case the text file will contain the table information.
Suggestion: run this first without saving to the text file, to verify results, then simply run it a second time with the "> cluster_info.txt" on the end.
Later statistics and calculations refer to the cluster index, so this information is typically used repeatedly.
P values and t statistics
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