用户和组
用户
# 查看用户
cat /etc/passwd
cat /etc/gshadow
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# 查看当前用户
whoami
who am i
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groupadd test-group
# 添加用户到组test-group
useradd -g test-group test-user && cat /etc/passwd | grep test-user && userdel -r test-user
useradd -g test-group -u 1111 test-user && cat /etc/passwd | grep test-user && userdel -r test-user
# 修改用户
useradd -g test-group test-user
usermod -l test-user-new test-user && cat /etc/passwd | grep test-user && && userdel -r test-user-new
# 删除用户
# 删除用户zhou，但不删除其家目录及文件；
userdel test-user
# 删除用户zhou，及其目录及文件一并删除；
userdel -r test-user
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组
# 查看组
cat /etc/group
cat /etc/shadow
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groupadd test-group
groupdel test-group
# -g：指定新建工作组的id；
groupadd -g 1111 test-group
cat /etc/group | grep test-group
groupdel test-group
# 添加测试组
groupadd test-group && cat /etc/group | grep test-group
# 修改组id
groupmod -g 1111 test-group && cat /etc/group | grep test-group
# 修改组名称
groupmod -n test-group-new test-group && cat /etc/group | grep test-group
# 删除新测试组
groupdel test-group-new
# 查看
groups
# 查看用户nobody所在组
groups nobody
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权限
# 修改文件权限 用户 组
vi test
chmod +x test
chmod 755 test
chown nobody test
chgrp nobody test
rm -f test
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