在Linux中写脚本的时候,总免不了需要判断文件是否存在、文件内容是否为空等存在,而这些操作都可以用test 指令来实现 -s FILE FILE exists and has a size greater than zero 如果文件存在且文件大小大于零,则返回真 -e FILE FILE exists 如果文件存在,则返回真 在shell中通过test指令测试文件是否为
ubuntu linux 에서 shell script 를 사용하다보면 파일의 유무를 확인해야 하는 경우가 자주 있습니다. 이럴 때 사용할 수 있는 방법은 조건문에서 특별한 옵션을 사용하는 것 입니다. 기...
Bash Script – Check If File is Empty or Not With the -s Option touch/tmp/f1echo"data">/tmp/f2ls-l /tmp/f{1,2} [ -s /tmp/f1 ]echo$?# output is 1[ -s /tmp/f2 ]echo$?# out put is 0# -s FILE FILE exists and has a size greater than zerohttps://www.computerhope.com...
shell脚本判断文件是否存在 Shell脚本Hadoop判断文件是否存在在Hadoop集群中,是一个常见的操作。可以使用Shell脚本来实现这一功能,通过使用Hadoop的命令行工具和一些Shell脚本语法,可以轻松地完成这个任务。 ## 1. Hadoop命令行工具 Hadoop提供了一系列的命令行工具,用于操作HDFS(Hadoop分布式文件 存在的 $? -ne 0 不存...
In a script, you would typically use it in an if statement. To negate and check if the folder or file doesnotexist, use either "!" or "-not", and remember to enclose the Test-Path statement in parentheses. Also remember that if the path or folder name contains a space, you need to...
typescript 上面的例子中的JavaScript语法可能看起来有点古怪。它使用了一种叫做带标签的模板字符串[3]的语言特性。它在功能上与编写await $("ls")相同。 谷歌的zx提供了其他几个实用功能,使编写shell脚本更容易。比如: cd()。允许我们更改当前工作目录。
A shell script is a series of commands written in a file; the shell reads the commands from the file just as it would if you typed them into a terminal. 如果你能在 shell 中输入命令,你就能编写 shell 脚本(也称为 Bourne shell 脚本)。 shell 脚本是写在文件中的一系列命令;shell 会从文件...
- name: check if exists stat: 'path=/root/' register: script_stat - debug: msg=" exists" when: script_stat.stat.exists - name: run the script command: 'sh /root/' - name: Create a directory if it does not exist file: 'path=/etc/nginx state=directory mode=0755' ...
scriptDir="$( cd "$( dirname"${BASH_SOURCE[0]}")" && pwd )" # Check if the symmetric key file exists in the same directory symmetricKeyPath="$scriptDir/.sim.key" if[ ! -f"$symmetricKeyPath"]; then echo"SymmetricKey file was not found in the same directory as the script." ...
else echo "$filename does not exist." fi 在运行这个脚本时,你可以传递一个文件名作为参数: ./check_file.sh example.txt 3.2 日志和错误处理 为确保脚本的稳健性,你需要添加日志记录和错误处理。例如,一个带有日志功能的脚本: #!/bin/bash log_file="/var/log/my_script.log" function log_message()...