Install a patch:

# patchadd 105591-20

Remove a patch:

# patchrm 105591-20

Check for a patch:

# showrev -p | grep 105591

Patch: 105591-20 Obsoletes: 101242-13 Requires: 107733-09 Incompatibles:  Packages: SUNWlibC

Display patch logs:

# more /var/sadm/patch/118822-20/log

Display the patch cluster log:

# more /var/sadm/install_data/Solaris_10_Recommended_Patch_Cluster_log