小编给大家分享一下shell如何实现for循环、循环变量值付给其他shell脚本，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
本文主要将在shell中如何编写for循环，并将循环变量作为下个shell脚本的参数。
shell for 循环：
#!第一种写法 类似C、Javafor ((i=1; i<=100; i ++))do echo $i done#!第二种写法 in应用for i in {1..100} do echo $i done #!第三种写法 seq 使用for i in `seq 1 100` do echo $i done将循环变量赋值到下一个脚本：
在运行shell脚本时候，有三种方式来调用外部的脚本，exec（exec script.sh）、source（source script.sh）、fork（./script.sh）
1、exec（exec /home/script.sh）：
使用exec来调用脚本，被执行的脚本会继承当前shell的环境变量。但事实上exec产生了新的进程，他会把主shell的进程资源占用并替换脚本内容，继承了原主shell的PID号，即原主shell剩下的内容不会执行。
2、source（source /home/script.sh）
使用source或者“.”来调用外部脚本，不会产生新的进程，继承当前shell环境变量，而且被调用的脚本运行结束后，它拥有的环境变量和声明变量会被当前shell保留，类似将调用脚本的内容复制过来直接执行。执行完毕后原主shell继续运行。
3、fork（/home/script.sh）
直接运行脚本，会以当前shell为父进程，产生新的进程，并且继承主脚本的环境变量和声明变量。执行完毕后，主脚本不会保留其环境变量和声明变量。
#!main.sh主体#!/bin/sha=mainecho "a is $a"echo "PID for parent before 2.sh:$$"case $1 in exec) echo "using exec" exec ./2.sh ;; *) echo "using sourcing" source ./2.sh ;;esacecho "PID FOR parent after 2.sh :$$"echo "now m"#！2.sh#!/bin/shecho "PID FOR 2.SH:$$"echo "2.sh get a from main.sh is $a"a=2.shexport ab=3.shecho "now 2.sh a is $a"执行结果：
a is mainPID for parent before 2.sh:1162using sourcingPID FOR 2.SH:11622.sh get a from main.sh is main`这里写代码片`now 2.sh a is 2.shPID FOR parent after 2.sh :1162now m通过for循环，循环变量作为2.sh变量赋值并执行。
#！main主函数#!/bin/sha=0for ((i=1; i<=10; i ++))do a=$i echo "a is $a" echo "PID for parent before 2.sh:$$" echo "using sourcing" source ./2.sh echo "PID FOR parent after 2.sh :$$" echo "now a is $a" done输出结果：
a is 1PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 1now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 2PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 2now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 3PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 3now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 4PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 4now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 5PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 5now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 6PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 6now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 7PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 7now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 8PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 8now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 9PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 9now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sha is 10PID for parent before 2.sh:1339using sourcingPID FOR 2.SH:13392.sh get a from main.sh is 10now 2.sh a is 2.shPID FOR parent after 2.sh :1339now a is 2.sh看完了这篇文章，相信你对“shell如何实现for循环、循环变量值付给其他shell脚本”有了一定的了解，如果想了解更多相关知识，欢迎关注编程网行业资讯频道，感谢各位的阅读！
