For files, X means executable;
For directories, X means you can enter this directory.
Some files require execution permission. For example, a script file must have execute permission. For example, if there is a file a.sh, its permission is rw-, you cannot use "./a .sh" to run, you will be prompted to have no permissions, you can only use sh a.sh way to run. With the x privilege, chmod u+x a.sh, you can execute this script with ./a.sh.
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