Shell script loop using for while explanation

Loops in any programming language are more than enough, and of course the shell script also has a looping statement, including a for statement, while statement. This article mainly uses the actual use case to illustrate what common use methods and techniques are used for the while.

one, for loop use

1. SEQ Command mode

 for  in $ (seq);  do    Echo " $i "  Done

2. C Language Grammar method

 for ((i=0; i<9; i++));  do    Echo " $i "  Done

3. Looping through a list of files

 for file  in $ (lsdoes    echo"$file" Done

4. Looping through array elements

 for inch  do    Echo " $i "  Done

5. Looping through the script parameter list

 for inch  do    Echo " $arg "  Done

6. Explicitly specifying a list

 for inch 1 2 3 ;  do    Echo $i  Done

7. List for loop

 for inch {1.. 5  do    Echo " $i "  Done

8. Step-Count jumping mode for loop

 for inch {1.. . 2};  do    Echo " $i "  Done

second, while loop use

1. Common while syntax

 while ((i<= ));  Do     ... ...  Done

 while " $num " 4  Do     ... ...  Done

 while " $num " 0  Do     ......  Done

Pending update ...

Shell script loop using for while explanation