Xing's Blog

wget - download files from the web. It supports HTTP , HTTPS , and FTP protocols, as well as retrieval through HTTP proxies. It is non-interactive.

compare the contents from two files

poweroff, halt and reboot are commands to stop system hardward.

date - display or set system time.

alias - Creates aliases. Alias are simple names for commands.

ping - test if a host is reachable on a network by sending ICMP ECHO_REQUEST to network host.

xxd - create hexadecimal representation(hexdump) for a file. use it to view files in binary or hexadecimal.

ln - create hard link or symbolic(soft) link to files and directories.

free - Display amount of free and used memory in the system.

xargs can be used to process the files return from find command.

tr - Translate characters.

sort - Sort lines of text files.

file - determine file type.

awk is often used to process text files.

du - list the sizes of a folder and any subfolders