Linux shell programming process control, linuxshell

Linux shell programming process control, linuxshell

If statement:

Test is used in the past.

Example 1: When the hard disk exceeds 80%, notify the Administrator

Example 2: Automatically Restart Apache when it is disabled

Example 3: multi-branch if statement

Example 4: Back up the etc directory

Case statement:

For statement:

Batch decompression is similar

Batch add users

While statement:

Until loop:

Contrary to the while LOOP, as long as the judgment condition is not true, the condition is always in the loop, knowing that the condition is true

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