how to use ftp in linux to copy files from remote system.
 

I need to copy some files & directiories from linux or aix. need some basic ftp commands for the same.

Connect to the server ("ftp server") and then after inputting your username and password (which I believe you'll be prompted for), you should just be able to cd to the directory containing the files and then use "get" to get the file, e.g. "get foo" to get a file called foo.

mget to get multiple files and prompt to suppress the prompt when retrieving multiple files
bin and asc for binary and ascii mode