Shell exit, return summary, shell exit summary

Shell exit, return summary, shell exit summary

Common Responses in shell: exit, breakm, return

Exit:

In fact, after each command is executed, an execution state is returned!

If the execution is successful, 0 is returned.

If the execution limit is not exceeded, a non-zero value is returned!

Example application: Used in shell scripts to make true and false judgments,

If the previous statement is OK, shell then executes the next command;

If the preceding error occurs and the returned value is non-zero, exit shell directly;

Break:

It can only be used in shell internal loops, such as if... then... else... fi.

Return:

This function is very useful and returns values from the function.

Echo:

Execute echo "xxx" and the executable output value

Execute echo "$ xxx" to output variable values

Link: shell exit and exit