Process Control of Linux shell programming

If statement:

It used to be a test.

Example 1: Notify the manager when the hard drive is over 80%

Example 2:apache Auto-restart when closed

Example 3: Multi-branch if statement

Example 4: Backup etc directory

Case statement:

For statement:

Bulk decompression is similar

Bulk Add Users

While statement:

Until cycle:

As opposed to the while loop, as long as the condition is not established, the loop is known and the condition is established.

Use until to achieve the same effect as the above example:

Process Control of Linux shell programming