EXEC (man1p)
exec — execute commands and open, close, or copy file descriptors
exec — execute commands and open, close, or copy file descriptors
fuser — list process IDs of all processes that have one or more files open
link — call link() function
fc — process the command history list
tee — duplicate standard input
renice — set nice values of running processes
ulimit — set or report file size limit
ls — list directory contents
man — display system documentation
rm — remove directory entries