一 幫助命令man 1、語法 man 命令 獲取指定命令的幫助。 2、舉例 man ls 檢視ls的幫助。 二 man的級別

  檢視命令擁有哪個級別的幫助 man -f 命令 whatis 命令 三 檢視和命令相關的所有幫助 man -k 命令 相當於 apropos 命令 例如 apropos passwd 三 實戰 [[email protected] test]# man ls [[email protected] test]# man man [[email protected] test]# man -f ls ls (1) - list directory contents ls (1p) - list directory contents [

[email protected] test]# man -f passwd sslpasswd (1ssl) - compute password hashes passwd (1) - update user's authentication tokens passwd (5) - password file [[email protected] test]# man 1 passwd [[email protected] test]# man 5 passwd [[email protected] test]# whereis passwd passwd: /usr/bin/passwd /etc/passwd /usr/share/man/man1/passwd.1.gz /usr/share/man/man5/passwd.5.gz [

[email protected] test]# man 5 passwd [[email protected] test]# whatis ls ls (1) - list directory contents ls (1p) - list directory contents [[email protected] test]# man -f null null (4) - data sink [[email protected] test]# man 4 null [[email protected] test]# whereis ifconfig ifconfig: /usr/sbin/ifconfig /usr/share/man/man8/ifconfig.8.gz [

[email protected] test]# apropos passwd chpasswd (8) - update passwords in batch mode fgetpwent_r (3) - get passwd file entry reentrantly getpwent_r (3) - get passwd file entry reentrantly gpasswd (1) - administer /etc/group and /etc/gshadow grub2-mkpasswd-pbkdf2 (1) - Generate a PBKDF2 password hash. lpasswd (1) - Change group or user password lppasswd (1) - add, change, or delete digest passwords. pam_localuser (8) - require users to be listed in /etc/passwd passwd (1) - update user's authentication tokens sslpasswd (1ssl) - compute password hashes passwd (5) - password file passwd2des (3) - RFS password encryption pwhistory_helper (8) - Helper binary that transfers password hashes from passwd or shadow to opasswd saslpasswd2 (8) - set a user's sasl password smbpasswd (5) - The Samba encrypted password file smbpasswd (8) - change a user's SMB password [[email protected] test]# man -k passwd chpasswd (8) - update passwords in batch mode fgetpwent_r (3) - get passwd file entry reentrantly getpwent_r (3) - get passwd file entry reentrantly gpasswd (1) - administer /etc/group and /etc/gshadow grub2-mkpasswd-pbkdf2 (1) - Generate a PBKDF2 password hash. lpasswd (1) - Change group or user password lppasswd (1) - add, change, or delete digest passwords. pam_localuser (8) - require users to be listed in /etc/passwd passwd (1) - update user's authentication tokens sslpasswd (1ssl) - compute password hashes passwd (5) - password file passwd2des (3) - RFS password encryption pwhistory_helper (8) - Helper binary that transfers password hashes from passwd or shadow to opasswd saslpasswd2 (8) - set a user's sasl password smbpasswd (5) - The Samba encrypted password file smbpasswd (8) - change a user's SMB password