??????Linux??????????????????
??????????
????## linux ?姹� ##
????lslogins
????## BSD ?姹� ##
????logins
????????????
UID USER      PWD-LOCK PWD-DENY LAST-LOGIN GECOS
0 root             0        0   22:37:59 root
1 bin              0        1            bin
2 daemon           0        1            daemon
3 adm              0        1            adm
4 lp               0        1            lp
5 sync             0        1            sync
6 shutdown         0        1 2014-Dec17 shutdown
7 halt             0        1            halt
8 mail             0        1            mail
10 uucp             0        1            uucp
11 operator         0        1            operator
12 games            0        1            games
13 gopher           0        1            gopher
14 ftp              0        1            FTP User
27 mysql            0        1            MySQL Server
38 ntp              0        1
48 apache           0        1            Apache
68 haldaemon        0        1            HAL daemon
69 vcsa             0        1            virtual console memory owner
72 tcpdump          0        1
74 sshd             0        1            Privilege-separated SSH
81 dbus             0        1            System message bus
89 postfix          0        1
99 nobody           0        1            Nobody
173 abrt             0        1
497 vnstat           0        1            vnStat user
498 nginx            0        1            nginx user
499 saslauth         0        1            "Saslauthd user"
????????????????????????????????????
????????????/var/www/html/??????/home/projects/www/current?????????tarball??????????/var/www/html?渭???????????????????些????????????????????????????????
????cd /var/www/html/
????/bin/rm -f "$(tar ztf /path/to/file.tar.gz)"
??????top?????????械????
?????????????????????????htop????top??
????sudo htop
???????????????????????
????????????!!?????纾�
????/myhome/dir/script/name arg1 arg2
????# ?????????????????
????!!
????## ??root??????泻????械?????
????sudo !!
????!!?????薪????????睢�????薪????械???“foo”???????
????!foo
????# ??root??????????????“service”?????????
????sudo !service
????!$???????写?????????????????
????# ?? nginx.conf
????sudo vi /etc/nginx/nginx.conf
????# ???? nginx.conf
????/sbin/nginx -t -c /etc/nginx/nginx.conf
????# ?????? "/sbin/nginx -t -c /etc/nginx/nginx.conf"???????vi??伪?????????
????sudo vi !$
?????????????????????????
??????????????????????????????????????
????leave +hhmm
????????
????hhmm – ???????hhmm???????hh???小???12??????24小??????mm???????????械?????????12???????????????????????12小?