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...
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...
If-statement-Bash-Script-Example if-else Statement 除了普通的 if 语句之外，我们还可以用 else 块扩...
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...
if grep $testuser /etc/passwd #查询 then #状态码0,执行 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 ...
-fFILETrueiffileexistsandisa regularfile. -gFILETrueiffileisset-group-id. -hFILETrueiffileisa symbolic link. -LFILETrueiffileisa symbolic link. -kFILETrueiffilehas its `sticky'bitset. -pFILETrueiffileisa named pipe. -rFILETrueiffileisreadable by you. ...
#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 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 c...
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 scrip...
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...