退出控制

return:函数返回
exit:脚本进程退出
break:退出当前循环
continue:退出当前循环进入下一次循环

continue跳高本次循环进入下一次
shiyanlou:Desktop/ $ while read line;do (($line<3)) || continue;echo line=$line;done 
2
line=2
3
4
5
6
1
line=1
3
shiyanlou:Desktop/ $ while read line;do (($line<3)) && continue;echo line=$line;done 
1
2
3
line=3
4
line=4
5
line=5
^C%                                                                                        shiyanlou:Desktop/ $  

break跳出循环

shiyanlou:Desktop/ $ while read line;do (($line<3)) && break;echo line=$line;done 
4
line=4
5
line=5
1
shiyanlou:Desktop/ $