每天一命令之wget

eg

  wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
  #不下载 ,
  -q,  --quiet                     安静模式 (无信息输出)

== -O file ,not number 0

      --output-document=file
          The documents will not be written to the appropriate files, but all will be concatenated together and written to file.
          If - is used as file, documents will be printed to standard output, disabling link conversion.  (Use ./- to print to a
          file literally named -.)

          Use of -O is not intended to mean simply "use the name file instead of the one in the URL;" rather, it is analogous to
          shell redirection: wget -O file http://foo is intended to work like wget -O - http://foo > file; file will be truncated
          immediately, and all downloaded content will be written there.

R

wget 使用技巧