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$ 4.2.20 4 207---> apropos "memory management"
XtAsprintf (3)       - memory management functions
XtCalloc (3)         - memory management functions
XtFree (3)           - memory management functions
XtMalloc (3)         - memory management functions
XtNew (3)            - memory management functions
XtNewString (3)      - memory management functions
XtRealloc (3)        - memory management functions
$ 4.2.20 5 208--->

$ 4.2.20 5 208---> apropos "source install"
libsrcinst (3)       - GNU Source Installer library API
sourceinstall (1)    - GNU Source Installer command line tool
$ 4.2.20 6 209---> apt-cache show sourceinstall
N: Unable to locate package sourceinstall
E: No packages found
$ 4.2.20 7 210--->