Flow Control
Command execution in a script flows from the first line to the last. However, it's possible to change the order of statement execution. The shell provides two types of commands that change the order of statement execution:
Conditional statements: The commands in a conditional statement execute only when a condition is found to be true. Some commands do not execute when the script runs because the condition under which they execute never occurs. By executing statements only when certain conditions are met, the script provides more flexibility to respond to varying conditions. For instance, the script can delete junk files if today is Friday, but not if today is Monday.
The shell provides two conditional statements:
if statement:
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