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useradd -s /bin/zsh -c 'my user' -m anna
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Create user anna with default shell (-s) and home dir (-m)
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id user
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Show user info
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groupadd sales
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Create 'sales' group
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usermod -aG sales anna
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Add anna to supplementary group 'sales'
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useradd -D
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Display default value of user
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/etc/default/useradd
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Configuration file for default value
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/etc/login.defs
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Additional configuration value
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/etc/skel
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Content in skel will be copied to new user home dir
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lid -g groupname
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List all users that are members of a group
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yum groups install 'Directory Client'
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Install the Utility
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yum install authconfig-gtk
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Install graphic interface of auth
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/etc/security/limits.conf
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Limit configuration file:nproc, hard limit, soft limit
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setfacl -R -m d:g:sales:rx account
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Set ACL so 'sales' group can read, execute on account dir and all sub-dir on default
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getfacl
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Display all access control list permissions (+ symbol)
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env (environment variable)
export *var* (store variable)
unset *var* (reset variable)
env -i bash (change environment)
vim /etc/environment (set new variable)
LINUX="/home/long"
source /etc/environement (source new variable w/o reboot)vim /etc/skel/.bashrc (file for setting)
/etc/skel (putting new file here will make it default for new user only)|
Read
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4, Read on File, Ls on Di
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Write
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2, Modify on File, Create/Del on Dir
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Execute
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1, Run on File, Cd into Dir
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chgrp account account
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Change group owner of account dir to 'account' group
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chown anna account
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Change anna to owner of 'account' dir
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chown linda.sales sales
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Change user and group owner of 'sales' dir to linda, sales
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chmod g+w account
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Make members of 'account' group have write permissions on account dir
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chmod 770 sales
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Make user, group have read, write, execute permission; others none
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chattr +i file1
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Make file1 has "immutable" attribute
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yum install -y quota
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Install quota package
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vim /etc/fstab
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Config file for mounting file system automatically
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mount -o remount /quota
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Make sure the file system mounted with right options
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quotacheck -mavug
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Scan the file system
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quota -vu lisa
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Display quota on user lisa
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quotaon -a
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Activating quota
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edquota -u lisa
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Edit quota limit on user lisa; soft to 10; hard to 10
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edquota -b lisa linda
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Copy the quota limit from lisa to linda
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dd if=/dev/zero of=/quota/bigfile bs=1M count=3
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if input file; of output file; bs block size; write 3 times
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repquota -aug
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Display quota overview
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echo password | passwd -stdin brenda
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Echo password to change brenda's password
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chage brenda
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Interactive change
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cat /etc/group
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Group config file
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sales:x:1004:anna
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GroupName:Password:GroupID:GroupMembers
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cat /etc/passwd
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User config file
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cat /etc/shadow
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User Config file
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vipw -s
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vi passwd consistently
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suio
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4; run as owner on file
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sgio
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2; run as group owner on file; inherit dir group owner
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sticky
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1; delete only if owner on dir
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chmod u+s playme
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Set UserID bit on playme
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chmod g+s *
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Set GroupID bit on *
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chmod +t *
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Apply StickyBit, other users cannot delete file created by owner
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find -perm 0600
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Find file with read,write for users only
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find / -perm /4000 -exec ls -l {} \;
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Find files in root dir with userID bit and list it
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