title: bash cat multiple files content in to single string without newlines
body: <p>i got some files with name start as eg_. and only each contains one single line</p>
  
  <p>eg_01.txt:
  @china:129.00</p>
  
  <p>eg_02.txt
  @uk:219.98</p>
  
  <p>eg_03.txt
  @USA:341.90</p>
  
  <p>......</p>
  
  <p>i am expecting to cat them in to a single line to send by URL like:
  @china:129.00@uk:219.98@USA:341.90</p>
  
  <p>i use 
  echo <code>cat eg_*</code></p>
  
  <p>it give me the output look like a string, but it actually contains new line:
  "@china:129.00</p>
  
  <p>@uk:219.98 
  @USA:341.90" </p>
  
  <p>is there any other way i can construct that string which expected and get rid of new line and even the space?  is only cat enough to do this?</p>
  
  <p>thanks in advance </p>