Linuxϵͳѧϰ֮LinuxÕ˺ŹÜÀí
Ò»¡¢»ù±¾½éÉÜ LinuxÓû§·ÖΪÈýÀ࣬¼´ÆÕͨÓû§¡¢¸ùÓû§¡¢ÏµÍ³Óû§¡£ ÆÕͨÓû§Ö¸µÄÊÇËùÓÐʹÓÃLinuxϵͳµÄÕæʵÓû§¡£ ¸ùÓû§¾ÍÊÇrootÓû§£¬È¨ÏÞ×î´ó£¬ËüµÄIDΪ0£¬Ò²±»³ÆΪ³¬¼¶Óû§£¬rootÓû§ÓµÓжÔϵͳ¾ø¶ÔµÄ¿ØÖÆȨ£º¿ÉÒÔÐ޸ġ¢É¾³ý¡¢ÔËÐÐÈκÎÎļþ¡£ËùÒÔ´ÓÁíÍâÒ»·½ÃæÀ´Ëµ£¬ËüÒ²ÊÇ×îΣÏյġ£ ϵͳÓû§ÊÇָϵͳÔËÐÐʱ±ØÐëÓеÄÓû§£¬²¢²»ÊÇÖ¸ÕæʵµÄʹÓÃÕß¡£ ±ÈÈçÔÚRedHat»òCentOSÏÂÔËÐÐÍøÕ¾·þÎñʱ£¬ÐèҪʹÓÃϵͳÓû§apacheÀ´ÔËÐÐhttpd½ø³Ì£¬¶øÔËÐÐmysqlÊý¾Ý¿â·þÎñʱ£¬ÐèҪʹÓÃϵͳÓû§mysqlÀ´ÔËÐÐmysqld½ø³Ì¡£ ͨ¹ýps auxÃüÁî¿ÉÒԲ鿴ϵͳÓû§½ø³Ì¡£ ls -l ÎļþÃû ¿ÉÒԲ鿴¸ÃÎļþȨÏÞ ls -l £¨ÔÚ²»¼ÓÎļþÃûµÄÇ°ÌáÏ¿ÉÒԲ鿴ËùÓÐÎļþȨÏÞ£© id ¿ÉÒԲ鿴×Ô¼ºµÄUID groups ¿ÉÒÔÈ·ÈÏ×Ô¼ºËùÔÚµÄ×é who ²éѯµ±Ç°ÔÚÏßÓû§ ¶þ¡¢Õ˺ŹÜÀí ÐÂÔöÓû§: useradd Óû§Ãû ÐÞ¸ÄÃÜÂë :passwd Óû§ÃûÐ޸ĻòÕßÖ±½Ópasswd £¨×¢ÒâÇ°ÕßÃÜÂëÉèÖúܼòµ¥£¬¿Éͨ¹ý£¬ºóÕßÃÜÂëÈç¹ûÉèÖùýÓÚ¼òµ¥£¬»áµ¼ÖÂÉèÖÃʧ°Ü£© ÐÞ¸ÄÓû§:usermod ÀýÈç:
[root@Cfhost-170820-UCNK ~]# useradd tom
[root@Cfhost-170820-UCNK ~]# passwd tom
Changing password for user tom.
New password:
Retype new password:
Sorry,passwords do not match.
New password:
BAD PASSWORD: it is too short
BAD PASSWORD: is too simple
Retype new password:
passwd: all authentication tokens updated successfully.
//²é¿´Óû§tomÔÚ/etc/passwdÖеļǼ,ðºÅ¸ô¿ªµÄÊÇÓû§tomµÄмÒĿ¼
[root@Cfhost-170820-UCNK ~]# cat /etc/passwd | grep tom
tom:x:559:559::/home/tom:/bin/bash//Èç¹ûÏ£ÍûÐ޸ļÒĿ¼Ϊ/home/tom_new,¿ÉÒÔʹÓÃÒÔÏÂÃüÁî
[root@Cfhost-170820-UCNK ~]# usermod -d /home/alice_new -m alice
usermod: directory /home/alice_new exists
[root@Cfhost-170820-UCNK ~]# usermod -d /home/tom_new -m tom
[root@Cfhost-170820-UCNK ~]# cat /etc/shadow | grep tom
tom:$6$Pii73qyW$8NvDm/UevXhiPowgdvtjv78pjrDUazxOldmuAEYIQZ0yiGRQQpgD9bZwsIkO
wuAOzv/D33IEL8/s..yPZPm8m.:17476:0:99999:7:::
[root@Cfhost-170820-UCNK ~]# usermod -L tom//¶³½á¸ÃÓû§
//Ö´ÐÐÏÂÁÐÃüÁîʱ£¬Äã»á·¢ÏÖµÚ¶þÁжàÁËÒ»¸ö¸Ð̾ºÅ£¬Ê¹ÓÃusermo -U tomÃüÁî¿ÉÒԽⶳ½á
[root@Cfhost-170820-UCNK ~]# cat /etc/shadow | grep tom
tom:!$6$Pii73qyW$8NvDm/UevXhiPowgdvtjv78pjrDUazxOldmuAEYIQZ0yiGRQQpgD9bZwsIkOwuAOzv/D33IEL8/s..yPZPm8m.:17476:0:99999:7:::
?ɾ³ýÓû§£ºuserdel Óû§Ãû userdel tom ¸ÃÃüÁ»áɾ³ýtomÔÚ/etc/passwdºÍ/etc/shadowÖеļǼ£¬µ«ÊDz¢²»»áɾ³ýÔÀ´Óû§µÄ¼ÒĿ¼ºÍÓʼþÐÅÏ¢¡£¿ÉÒÔʹÓÃuserdel -r Óû§Ãû À´´ïµ½³¹µ×ɾ³ýµÄÄ¿µÄ¡£ ? ÐÂÔöºÍɾ³ýÓû§ groupadd ×éÃû #ÐÂÔö×é groupdel ×éÃû #ɾ³ý×é ¼ì²éÓû§ÐÅÏ¢: users ²é¿´µ±Ç°ÓÐÄÄЩÓû§ who ²é¿´ÔÚÏßÓû§ w ¿ÉÒԲ鿴Óû§¸ü¼ÓÏêϸµÄÐÅÏ¢£¨°üÀ¨µÇ¼ʱ¼ä¡¢ipµØÖ·µÈ£© µ÷²éÓû§:finger fingerÃüÁîÔÚ²»¼ÓÈκβÎÊýµÄÇé¿öÏ£¬Í¬Ñù»áÏÔʾϵͳµÄµÇ¼Óû§£¬ÈçÏÂͼËùʾ Login Name Tty Idle Login Time Office Office Phone
root root pts/0 38 Nov 6 19:04 (183.240.196.151)
root root pts/1 21 Nov 6 19:29 (183.240.196.151)
root root pts/2 Nov 6 19:46 (183.240.196.151)
root root pts/3 21 Nov 6 19:46 (183.240.196.151)
²¹³ä£ºÈç¹ûÔÚfinger Óû§Ãû »áÏÔʾ¸ÃÓû§Ãû¸ü¼ÓÏêϸµÄÐÅÏ¢ Çл»Óû§: su ÃüÁîµ¥¶ÀʹÓÃÖ±½ÓÇл»ÎªrootÓû§ su - Óû§Ãû Çл»µ½¸ÃÓû§ ×¢Ò⣺ʹÓÃsuÃüÁîËäÈ»·½±ã£¬µ«»¹ÊÇ´æÔÚȱÏÝ£¬¾ÍÊÇÇл»µ½ÆäËûÓû§Ê±£¬ÐèÒªÖªµÀ¸ÃÓû§µÄÃÜÂ룬Èç¹ûÐèÒªÇл»µ½root£¬ÄǾÍÐèÒªÖªµÀrootµÄÃÜÂë¡£ÎÒÃÇÖªµÀrootÊÇϵͳÖÐ1ȨÏÞ×î¸ßµÄÓû§£¬Èç¹ûÈÃÌ«¶àÈËÖªµÀrootÃÜÂëÊǷdz£²»°²È«µÄ£¬ËùÒÔÎÒÃǽ¨ÒéʹÓÃsudo¡£ ÀýÐÐÈÎÎñ¹ÜÀí µ¥Ò»Ê±¿ÌÖ´ÐÐÒ»´ÎÈÎÎñ:at ÀýÈç: at now + 10 munutes //30·ÖÖÓºó¹Ø»ú atq²é¿´µ±Ç°Ê¹ÓÃatÃüÁîµ÷¶ÈµÄÈÎÎñÁбí atrm ɾ³ýÒѾ½øÈëÈÎÎñ¶ÓÁеÄÈÎÎñ ÖÜÆÚÐÔÖ´ÐÐÈÎÎñ:cron crontab -l ²é¿´ÉèÖõÄÈÎÎñ crontab -r ɾ³ýËùÓÐÈÎÎñ crontab -u Óû§Ãû -l? //²é¿´¸ÃÓû§ÈÎÎñÁбí ? £¨±à¼£ºÀî´óͬ£© ¡¾ÉùÃ÷¡¿±¾Õ¾ÄÚÈݾùÀ´×ÔÍøÂ磬ÆäÏà¹ØÑÔÂÛ½ö´ú±í×÷Õ߸öÈ˹۵㣬²»´ú±í±¾Õ¾Á¢³¡¡£ÈôÎÞÒâÇÖ·¸µ½ÄúµÄȨÀû£¬Ç뼰ʱÓëÁªÏµÕ¾³¤É¾³ýÏà¹ØÄÚÈÝ! |
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