alias dir="ls -laF - lets you use the familiar DOS dir command instead of the UNIX ls command
whereis ls - will search the directories in the path and tell you if the file you specify is in any of them, and if so which one.
cp [OPTION] [-T] SOURCE DEST = copying


dir = list directory contents
cd [-L|-P] [dir]

gzip 
[-cdfhlLnNrtvV19] [-S suffix] [file ...]
 -c --stdout      write on standard output, keep original files unchanged
 -d --decompress  decompress
 -f --force       force overwrite of output file and compress links
 -h --help        give this help
 -l --list        list compressed file contents
 -L --license     display software license
 -n --no-name     do not save or restore the original name and time stamp
 -N --name        save or restore the original name and time stamp
 -q --quiet       suppress all warnings
 -r --recursive   operate recursively on directories
 -S .suf  --suffix .suf     use suffix .suf on compressed files
 -t --test        test compressed file integrity
 -v --verbose     verbose mode
 -V --version     display version number
 -1 --fast        compress faster
 -9 --best        compress better
    --rsyncable   Make rsync-friendly archive
 file...          files to (de)compress. If none given, use standard input.