1, 文件系统及相关: cd; whereis; pwd; ls; file; echo; mkdir/rmdir; cat/more; cp,mv,rm; chown,chgrp; chmod; grep; find; locate; ln; gzip; tar; diff; patch
2, 磁盘管理: df; du; mount/umount; fdisk; mkfs
3, 用户管理: useradd; usermod; userdel; groupadd; groupmod; groupdel; passwd; id; groups; who; whoami
4, 系统及其它: su; sudo; export; shutdown/poweroff/halt/reboot; ps; top; uname; uptime; clear; cal; date/time
5, 网络配置管理: netstat; nslookup; finger; ping; ifconfig; ftp; telnet; ssh
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