When trying to understand the working of a function like if-else in a shell script, it is good to start things simple. Here, we initialize two variables a and b, then use the if-else function to check if the two variables are equal. The bash script should look as follows for this t...
Script Usage 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, ...
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 $? -ne 0 不存在,$? -eq 0 存 shell...
FILE exists and is set-group-ID -G FILE FILE exists and is owned by the effective group ID -h FILE 파일이 존재하고 symbolic link 파일인지 확인 FILE exists and is a symbolic link (same as -L) -k FILE FILE exists and has its sticky bit set -L FILE 파일...
echo "The user $testuser exists on this system." else #否则,执行 echo "The user $testuser does not exist on this system." if ls -d /home/$testuser/ #在进入一个if语句 then #状态码0 ,执行 echo "However, $testuser has a directory." ...
#if[ -x test9.sh]thenecho"You can run the script:"elseecho"Sorry,You are unable to execute the script"]fi 执行该脚本,结果如下: 2.8 检查所属关系 -O比较可以测试出你是否是文件的属主 #!/bin/bash #checkfileownership #if[ -O /etc/passwd]thenecho"You are the owner of the /etc/passw...
if [ -f $HOME/.bash_history ] then echo " but this is a file" else echo "this is not a file too" fi fi else echo "sorry the object dose not exists" fi exit 0 这段代码的意思就是首先检查HOME目录是否存在,如果存在,则判断home是不是一个文件,如果是就是输出这是一个文件,如果不是,就...
echo "this is not a file too" fi fi else echo "sorry the object dose not exists" fi exit 0 这段代码的意思就是首先检查HOME目录是否存在,如果存在,则判断home是不是一个文件,如果是就是输出这是一个文件,如果不是,就输出这不是一个文件,并且判断home下的bash_history是不是一个文件,如果是就输出...
If File exists then copy it script powershell If is not recognized as the name of a cmdlet? if not contains If statement based on day of the week evaluating despite being false If Test-Connection do these action else exit. If variable is null or empty skip in script If with multiple ...
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...