compgen -c

compgen -c ls

Cita:ls
lsusb
lsmem
lslocks
lsb_release
lstmtraining
lscpu
lss16toppm
lsipc
lsattr
lsof
lsinitramfs
lslogins
lspci
lshw
lstmeval
lspgpot
lsns
lsdiff
lsmod
lspcmcia
lsblk
lsmod
ls

for p in $(compgen -c ls); do whatis $p; done

Cita:ls (1)               - list directory contents
lsusb (8)            - list USB devices
lsmem (1)            - list the ranges of available memory with their online status
lslocks (8)          - list local system locks
lsb_release (1)      - print distribution-specific information
lstmtraining (1)     - Training program for LSTM-based networks.
lscpu (1)            - display information about the CPU architecture
lss16toppm (1)       - Convert an LSS-16 image to PPM
lsipc (1)            - show information on IPC facilities currently employed in the system
lsattr (1)           - list file attributes on a Linux second extended file system
lsof (8)             - list open files
lsinitramfs (8)      - list content of an initramfs image
lslogins (1)         - display information about known users in the system
lspci (8)            - list all PCI devices
lshw (1)             - list hardware
lstmeval (1)         - Evaluation program for LSTM-based networks.
lspgpot (1)          - extracts the ownertrust values from PGP keyrings and list them in GnuPG ownertrust format.
lsns (8)             - list namespaces
lsdiff (1)           - show which files are modified by a patch
lsmod (8)            - Show the status of modules in the Linux Kernel
lspcmcia (8)         - display extended PCMCIA debugging information
lsblk (8)            - list block devices
lsmod (8)            - Show the status of modules in the Linux Kernel
ls (1)               - list directory contents