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## Ubuntu
sudo apt install acl

## CentOS
sudo yum install acl

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getfacl -h
getfacl 2.2.52 -- get file access control lists
Usage: getfacl [-aceEsRLPtpndvh] file ...
  -a,  --access           display the file access control list only
  -d, --default           display the default access control list only
  -c, --omit-header       do not display the comment header
  -e, --all-effective     print all effective rights
  -E, --no-effective      print no effective rights
  -s, --skip-base         skip files that only have the base entries
  -R, --recursive         recurse into subdirectories
  -L, --logical           logical walk, follow symbolic links
  -P, --physical          physical walk, do not follow symbolic links
  -t, --tabular           use tabular output format
  -n, --numeric           print numeric user/group identifiers
  -p, --absolute-names    don't strip leading '/' in pathnames
  -v, --version           print version and exit
  -h, --help              this help tex

cd ~/Documents
getfacl Documents
# file: Documents
# owner: william
# group: william
user::rwx
group::r-x
other::r-x

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setfacl -h
setfacl 2.2.52 -- set file access control lists
Usage: setfacl [-bkndRLP] { -m|-M|-x|-X ... } file ...
  -m, --modify=acl        modify the current ACL(s) of file(s)
  -M, --modify-file=file  read ACL entries to modify from file
  -x, --remove=acl        remove entries from the ACL(s) of file(s)
  -X, --remove-file=file  read ACL entries to remove from file
  -b, --remove-all        remove all extended ACL entries
  -k, --remove-default    remove the default ACL
      --set=acl           set the ACL of file(s), replacing the current ACL
      --set-file=file     read ACL entries to set from file
      --mask              do recalculate the effective rights mask
  -n, --no-mask           don't recalculate the effective rights mask
  -d, --default           operations apply to the default ACL
  -R, --recursive         recurse into subdirectories
  -L, --logical           logical walk, follow symbolic links
  -P, --physical          physical walk, do not follow symbolic links
      --restore=file      restore ACLs (inverse of `getfacl -R')
      --test              test mode (ACLs are not modified)
  -v, --version           print version and exit
  -h, --help              this help text

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setfacl -R -m u:trader:rwx /data/ChinaStocks