如果第二次运行该脚本,将获得一个非零值,如下所示: [root@localhost ~]# sh myscript.sh 0 [root@localhost ~]# sh myscript.sh mkdir: cannot create directory ‘learning’: File exists 1 最佳实践 建议通过将set -x命令添加到shell脚本来启用调试模式,如下所示: [root@localhost ~]# cat test3.sh ...
file="/home/shiyanlou/test.sh" if [ -r $file ] then echo "The file is readable" else echo "The file is not readable" fi if [ -e $file ] then echo "File exists" else echo "File not exists" fi 结果 The file is readable File exists 思考 浮点运算,比如实现求圆的面积和周长。 exp...
이상 shell script (bash) 에서 file 유무 체크하는 방법과 옵션 (file exist check)에 대한 글 이였습니다. 저작자표시비영리변경금지
/bin/bash mkdir learning echo $? 如果运行上述脚本一次,它将打印 0,因为该目录不存在,因此脚本将创建它。如果第二次运行该脚本,将获得一个非零值,如下所示: [root@localhost ~]# sh myscript.sh 0 [root@localhost ~]# sh myscript.sh mkdir: cannot create directory ‘learning’: File exists 1 最佳...
我如何编写一个bash脚本来检查它是否正在运行,如果没有,则启动它。大致如下伪代码(或者它应该做一些类似 ps | grep 的事情?) 代码语言:javascript 复制 # keepalivescript.shifprocessidfile exists:ifprocessid is running:exit,all ok run checkqueue.py ...
MyFile=cars.txt if [ -f "$MyFile" ]; then echo "$MyFile exists." else echo "$MyFile does not exist." fi Running the script results in the following output: 22. Check Inodes and Disk Usage Inodes represent data units on a physical or virtual server. Each text file, video, folder...
File/usr/bin/boot.ini exists 请参阅之前的文章以了解各种bash if 语句类型。 Bash 示例 2. 比较数字 下面的脚本从用户那里读取两个整数,并检查这两个数字是否相等或大于或小于彼此。 $ cat numbers.sh #!/bin/bash echo"Please enter first number"read first ...
if[[ -e "file.txt" ]];thenecho"file exists"fi 文件条件 更多条件 逻辑和,或 if["$1"='y'-a$2-gt 0 ];thenecho"yes"fiif["$1"='n'-o$2-lt 0 ];thenecho"no" Bash 循环 基本for 循环 foriin/etc/rc.*;doecho$i 类似C 的 for 循环 ...
() 函数打开一个不存在的文件时,程序会抛出异常,我们可以通过...如果文件不存在,open 一.python判断文件和文件夹是否存在.创建文件夹 复制代码 代码如下: >>> import os >>> os.path.exists(‘d:/assist’) True.../floder’ if not tf.gfile.Exists(folder): #若文件夹不存在,则自动创建文件夹 ...
$mkdirusers2>errors.txt $caterrors.txt mkdir: cannot create directory ‘users’: File exists Most of the time, it is difficult to find the exact line number in scripts. To print the line number with the error, use thePS4option (supported with Bash 4.1 or later). Example below: ...