Shell Programming Basics while practicing

First, the grammar

 while [Condition]  # when the condition condition is established, loop until the condition is not set to stop doing     #执行内容done 

Second, practice

2. Enter the user input parameters until the user enters "end" to end the loop
   

    while "Plz input a Paramter" "End"  doecho'$param' done

   [Email protected]:~$./test. SH Plz Input A paramter:aaplz input a paramter:bbplz input a paramter:ccplz input a paramter:end[email protected]: ~$

3. Natural number of outputs from 1 to 5
   

    i=1  while  [  "  $i   "-le  do  echo   "  $i   " i  =$ (($i +1   done  

   [Email protected]:~$./test. SH 1 2 3 4 5 [email protected]:~$

Shell Programming Basics while practicing