1. 解释什么是“syntax error: bad for loop variable”错误 "syntax error: bad for loop variable" 错误通常指的是在编写 for 循环时,循环变量(即用于控制循环次数的变量)的声明或使用方式不符合编程语言的语法规则。这种错误常见于Python、Bash脚本等支持 for 循环的编程语言中。由于这个错误提示较为通用,具体的...
1、第一个简单的for循环 #!/bin/bash for i in 1 2 3 4; do echo $i; done 2、测试for的自增长的循环: #!/bin/bash for ((i=1; i<=5; i++)) do echo $i; done 如果会报错,没有则跳过: Syntax error: Bad for loop variable 原因:代码对于标准bash而言没有错,因为Ubuntu为了加快开机速度...
出现这种错误是因为有些linux系统默认会使用ash进行编译shell脚本,我的机器就是这样,但是我写的脚本是应该用bash执行的。虽然我在开头注明了#!/bin/bash,好像它还是默认去找了ash,真是让人无奈。上网搜索了一下,找到两种解决方案:1、修改脚本 2、修改系统默认执行shell的工具 第一种的具体做法就是,原来的for循环...
In Bash scripts, unexpected end of file error occurs due to structural mistakes such as incorrect syntax or missing keywords in the code. For example, if you have forgotten to end thefororwhileloop with proper structure then you may encounter such an error. Similarly, if you have missed a ...
2019-12-20 17:41 −脚本执行方式: source:用这个命令执行shell脚本的时候,不会创建新的bash(子进程),可以直接在父进程中执行,所以shell里面的变量会被改变。 sh script和./script:会创建子进程,在子进程里执行完shell后,父进程里的变量不会改变。 ... ...
Bad for loop variable是什么意思? 如何修复Bad for loop variable错误? 在ubuntu下跑一个测试脚本,提示for 循环的语法错误,查了一下,系统启动问题。 代码对于标准bash而言没有错,因为Ubuntu为了加快开机速度,用dash代替了传统的bash,是dash在捣鬼。 解决方法是 取消dash sudo dpkg-reconfigure dash 在选择项中选No...
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Example 3: for Loops Use afor loopincasestatements when there are many expressions to process. The following example returns all file types inside adirectory: 1. Create the shell script: vi filelist.shCopy 2. Enter the following lines to the file: ...
for line in $text; do read -a array <<< $line echo ${array[index]} done Bash array initialization multiple lines Code Example, bin/bash declare -a messages=( "Hello" "World" ) echo "${messages[@]}" Script with multiline string and for loop ...
Unexpected `done' token causes syntax error in Bash Solution: If there are no other important elements in your script, deletingdoneshould be sufficient. The shell keyworddoneis exclusively used to indicate the conclusion of awhile,for, oruntilloop. Any other usage of this keyword will result in...