Linux Practical Case Jobs (1)

1, the creation of a 10G file system, the type of EXT4, requires the boot can be automatically mounted to a separate data/data directory; #fdisk   /dev/sda#partx -a /dev/sda#mke2fs  -t ext4  /dev/sda3#mkdir  /data  /dev/sda3  /data ext4  defaults 0 0  2, displays a line with ' LISTEN ' followed by 0, one, or more white-space characters in the ' netstat -tan ' command result;[[email  protected] data]# netstat -tan |grep  ' Listen.*[[:space:]] ' tcp         0      0 0.0.0.0:22               0.0.0.0:*                LISTEN     tcp         0      0 127.0.0.1:631            0.0.0.0:*                LISTEN     tcp        0       0 127.0.0.1:25             0.0.0.0:*                listen     tcp6       0       0 :::22                    :::*                      LISTEN     tcp6        0      0 ::1:631                  :::*                      LISTEN     tcp6        0      0 ::1:25                   :::*                      listen3, add user Nginx, Zabbix, Tomcat, and Hadoop users (the Nologin user's shell is/sbin/nologin), and then find the row in the/etc/passwd file that has the same user name as its shell name;[[email  Protected] ~]# useradd nginx[[email protected] ~]# useradd zabbix[[email  protected] ~]# useradd tomcat[[email protected] ~]# useradd hadoop[[ Email protected] ~]# useradd -s /sbin/nologin nologin[[email protected]  ~]# grep  ' ^\ (\<[[:alnum:]]\+\>\). *\1$ '  /etc/passwdsync:x:5:0:sync:/sbin:/bin/ Syncshutdown:x:6:0:shutdown:/sbin:/sbin/shUtdownhalt:x:7:0:halt:/sbin:/sbin/haltnologin:x:1005:1005::/home/nologin:/sbin/nologin4, find/etc/rc.d/init.d/ Functions a word in a file (the middle of a word can be underlined) followed by a line of parentheses;[[email protected] ~]# grep  ' \<.\+\> () '  /etc/rc.d/init.d/functionscheckpid ()  {__pids_var_run ()  {__pids_pidof ()  {daemon ()  { Killproc ()  {pidfileofproc ()  {pidofproc ()  {status ()  {echo_success ()  {echo_failure ()  {echo_passed ()  {echo_warning ()  {update_boot_stage ()  {success ()  {failure ()  { Passed ()  {warning ()  {action ()  {strstr ()  {is_ignored_file ()  {is_true ()  {is_false ( )  {apply_sysctl ()  {5, use echo to output a path, and then egrep find its path base name, and further use Egrep to remove its directory name (note that the directory name, not the directory path);[[email  protected] ~]# echo  "/MNT/SDC"   | grep -E -o  "[^/]+/?$"    | cut -d "/"   -f1sdc6, find all files that do not belong to root, bin, or Hadoop under the/usr directory; [[email protected] ~ ]# find /usr/ -not&nbSp;\ ( -user root -o -user bin -o -user hadoop \)  -ls67718147 &NBSP;&NBSP;&NBSP;&NBSP;4&NBSP;DRWX------   2 polkitd  root          4096 12 Month  29 22:01 /usr/share/polkit-1/rules.d67788273    12 -rwsr-sr-x   1 abrt     abrt         11232 3 Month  24  2015 /usr/libexec/ Abrt-action-install-debuginfo-to-abrt-cache7, one day the system was invaded, hackers in your system to leave a Trojan file: Now you need to find the current system is not a master or a group, and the last week has been visited all the files; In addition, you need to find All files that are larger than 20k in the/etc directory and are of the normal file type; [[Email protected] ~]# find /  \ ( -nouser -a  -nogroup \)  -a -atime -7 -lsfind:  '/PROC/4915/TASK/4915/FD/6 ':  No file or directory find:  '/PROC/4915/TASK/4915/FDINFO/6 ':  no that file or directory find:  '/PROC/4915/FD/6 ':  No file or directory find:  '/PROC/4915/FDINFO/6 ': &NBSP; no file or directory find:  '/RUN/USER/1000/GVFS ':  permissions are insufficient [[email protected] ~]# find /etc/  -size +20k -type f  -ls134657631  176 -r--r--r--    1 root     root       179212 12 Month  29 21:54 /etc/pki/ca-trust/extracted/java/cacerts201530249  316 -r--r--r--    1 root     root        321332 12 Month  29 21:54 /etc/pki/ca-trust/extracted/openssl/ca-bundle.trust.crt700354   236 -r--r--r--   1 root     root        240762 12 Month  29 21:54 /etc/pki/ca-trust/extracted/pem/ tls-ca-bundle.pem700355  188 -r--r--r--   1 root      root       191741 12 Month  29 21:54 /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem700356   188 -r--r--r--   1 root     root        191772 12 Month  29 21:54 /etc/pki/ca-trust/extracted/pem/ objsign-ca-bundle.pem67624879   64 -rw-r--r--   1 root      root        65536 3 Month   6   2015 /etc/pki/nssdb/cert8.db201886591  240 -rw-r--r--   1 root      root       242153 3 Month   6   2015 /etc/ssh/moduli136804649 6228 -r--r--r--   1 root      root      6376691 12 Month  29 22:00 /etc/udev/ Hwdb.bin67752520   60 -rw-r--r--   1 root     root         60408 3 Month   6  2015 /etc/lvm/lvm.conf202817359   52 -rw-r--r--    1 root     root         51272 6 Month  10  2014 /etc/gconf/schemas/nautilus-open-terminal.schemas201327306   656 -rw-r--r--   1 root     root        670293 6 Month   7  2013 /etc/services1608610    28 -rw-r--r--   1 root     root         26134 1 Month  15  2015 /etc/sysconfig/network-scripts/ network-functions-ipv6203120731   72 -rw-r--r--   1 root      root  &Nbsp;     70795 12 Month  29 22:05 /etc/ld.so.cache137359411   360 -rw-r--r--   1 root     root        365229 3 Month   6  2015 /etc/selinux/targeted/contexts/files/ file_contexts137359418   60 -rw-r--r--   1 root      root        58064 3 Month   6  2015 &NBSP;/ETC/SELINUX/TARGETED/MODULES/ACTIVE/BASE.PP137359420&NBSP;&NBSP;360&NBSP;-RW-------   1  root     root       365229 3 month    6  2015 /etc/selinux/targeted/modules/active/file_contexts137359422  368 - RW-------   1 root     root        376757 3 Month &NBSP;&NBSP;6&NBsp; 2015 /etc/selinux/targeted/modules/active/file_contexts.template202914041   24  -rw-r--r--   1 root     root         24383 3 Month   6  2015 /etc/selinux/targeted/modules/active/modules /apache.pp202914221   28 -rw-r--r--   1 root      root        28414 3 Month &NBSP;&NBSP;6&NBSP;&NBSP;2015&NBSP;/ETC /selinux/targeted/modules/active/modules/init.pp202914453   36 -rw-r--r--    1 root     root        33705  March   6  2015 /etc/selinux/targeted/modules/active/modules/staff.pp202914460    44 -rw-r--r--   1 root     root         44655 3 Month   6  2015 /etc/selinux/targeted/modules/active/modules/ sysadm.pp202914484   32 -rw-r--r--   1 root      root        29412 3 Month &NBSP;&NBSP;6&NBSP;&NBSP;2015&NBSP;/ETC /selinux/targeted/modules/active/modules/unprivuser.pp202914497   28 -rw-r--r--    1 root     root        26559  3 Month   6  2015 /etc/selinux/targeted/modules/active/modules/virt.pp202914511    24 -rw-r--r--   1 root     root         21063 3 Month   6  2015 /etc/selinux/targeted/ Modules/active/modules/xguest.pp202914512   28 -rw-r--r--   1 root      root &nBsp;      28639 3 Month   6  2015 /etc/selinux/targeted/ modules/active/modules/xserver.pp5197208 3752 -rw-r--r--   1 root      root      3839718 3 Month   6  2015 / etc/selinux/targeted/policy/policy.29201885278   28 -rw-r--r--   1  Root     root        25213 6 Month  10   2014 /etc/dnsmasq.conf201680462   36 -rw-r--r--   1  Root     root        65536 12 Month  29 &NBSP;21:55&NBSP;/ETC/OPENLDAP/CERTS/CERT8.DB2208809&NBSP;&NBSP;&NBSP;36&NBSP;-RW-------   1  root     root        65536 12 Month  29 21:57 /etc/ipsec.d/cert8.db68048011   52 -rw-r--r--   1 root      root        49286 3 Month   6  2015  /etc/brltty/fr-abrege.ctb68048174  268 -rw-r--r--   1 root      root       273315 3 Month   6   2015 /etc/brltty/ko.ctb68047990   40 -rw-r--r--   1 root      root        37790 3 Month   6   2015 /etc/brltty/de-kurzschrift.ctb68048181   56 -rw-r--r--   1  root     root        54704 3 Month   6  2015 /etc/brltty/letters-latin.tti68047998   24 -rw-r--r--    1 root &Nbsp;   root        20733 3 Month   6   2015 /etc/brltty/en-nabcc.ttb68048000   40 -rw-r--r--   1  Root     root        39633 3 month    6  2015 /etc/brltty/en-us-g2.ctb68048242   56 -rw-r--r--    1 root     root        56542  March   6  2015 /etc/brltty/zh-tw-polyphone.cti68048243  392 -rw-r--r--    1 root     root        400503 3 Month   6  2015 /etc/brltty/zh-tw-ucb.ctb68048244 1336 -rw-r--r--    1 root     root      1367395  3 Month   6  2015 /etc/brltty/zh-tw.ctb202304306   24 -rw-r--r--   1 root      root        21929 3 Month   6   2015 /etc/brltty.conf202901855   24 -rw-r--r--   1 root      root        20876 6 Month  10   2014 /etc/postfix/access202901862   24 -rw-r--r--   1 root      root        21545 6 Month  10   2014 /etc/postfix/header_checks202901863   28 -rw-r--r--   1  root     root        27176 6 Month  10  2014 /etc/postfix/main.cf8, create a directory/test/data, let a group of ordinary users have write permissions to it, and all the files created by the group of directories belong to the groups; Each user can only delete their own files. [[Email protected] ~]# mkdir -p /test/data[[email protected] data]# chmod g+s / test/data[[email protected] data]# chmod g+w /test/data[[email protected]  Data]# chmod o+t /test/data

This article is from the "July" blog, please be sure to keep this source http://927755.blog.51cto.com/917755/1730185

Linux Practical Case Jobs (1)