The chmod command is used to change the permissions of a file or directory. Only the owner of the file and the super user can execute this command. There are two setting modes, one is to use permission letters and operators; the other is to use numbers.
Syntax format: chmod [parameter] [file]
Common parameters:
Example
# 给test.sh脚本加个执行的权限，a为针对所有用户。r为读，w为写，x为执行chmod a+x test.sh # 给文件夹test递归设置权限755，读权限为4，写为2，执行为1，加起来是7 chmod -R 755 test
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