Shell exits, returns a summary

Common returns in the shell are: Exit,breakm,return

Exit

In fact, after each command is completed, it will return an execution state!

If the execution succeeds, it returns 0

If execution does not exceed, return non 0!

Example application: Use the shell script to make a true and false judgment,

If the previous sentence executes OK, the shell then executes the next command;

If the previous error, the return value is nonzero, then exit the shell directly;

Break

Can only be used within the shell loop, such as if ... then. else.. FI, etc.

Return

This is a very large use, returning a value from a function

Echo

Execute echo "xxx", executable output value

Perform echo "$xxx" to output the value of the variable

See Links: Shell exit and exit status

Shell exits, returns a summary