A blog distinguishes the state return value in the shell-return-break-continue-exit

a blog distinguishes the state return value in the shell -return-break-continue-exit

First, The difference and contrast between break, continue, exit, return

Condition and loop control and program return value command Knowledge table

Command	Description
break n	, the ,n
continue n	, the jump out of this loop, ignoring this loop's remaining code Span style= "font-family: ' The song body '; font-size:14px;" > Enter the next cycle of the loop. n n layers continue to loop
exit n	= shell program " Span style= "font-family: ' The song body '; font-size:14px;" >,n n can also be omitted, in the next shell $ exit n n
return n	In the function as the return value of the function shell $? "Receive exit n n

Second, Break ,continue,exit function execution Flowchart

1 . The execution flow logic diagram of break functionin the loop

2 . The execution flow logic diagram of bcontinue functionin the loop

3. The execution flow logic diagram of exit function in the loop

three, using a small script to differentiate break, continue , exit , return

[[email protected] ~]# vim 3.sh 
#!/bin/bash
#
#User : Mobanche
#Date : 2017-8-1
#Description :This shell script is used primarily to identify the state 
#             return value of a loop control that is distinguished from 
#             the return-break-continue-exit
 
if [ $# -ne 1 ]
then
        echo "usage: {conntiue|break|exit|return}"      
        exit 1
fi
 
test () {
        for ((i=1;i<=5;i++))
        do
                if [ $i -eq 3 ]
                then
                        $*
                fi
                echo $i
        done
        echo "I am function"
}
test $*
func_ret=$?
if [ `echo $*|grep return|wc -l` -eq 1 ]
then
        echo "return‘s exit status :$func_ret"
fi
echo OK

Test:

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A blog distinguishes the state return value in the shell-return-break-continue-exit