how to know whether a directory existing in my ubuntu

野心-优雅

于 2020-02-20 17:14:23 发布

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分类专栏： some_new_tricks

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本文介绍在Ubuntu系统中如何检查目录是否存在，使用 $? 的返回值判断。若为0，则目录存在；若为其他值，则目录不存在。同时介绍了创建新目录的方法，使用sudo mkdir命令。并提供了检查当前用户是否为超级用户的两种方法：通过UID判断或直接查看用户名。

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if you want to test a directory whether existing in your ubuntu computer

1:test -d /home
2:echo  $?
if the answer is 0,it means that this directory exists.
if other number,you can know that your computer doesn't have the directory

if you want to create a new directory, you can do like this

sudo mkdir /var/my_sql_back

if you want to see if you are the root user
you can use this command

echo $UID 
# if the result is 0, you are the superuser
# if not,you are not the superuser
#also you can do like this 
echo $USER
#it will tell you that who you are ,if the result is root 
#your computer are in superuser mode
#if not,you are now in the common mode