커널 로그

journalctl -kf


서비스 로그 

journalctl -u <unit_name> -f


unit_name 은 

systemctl list-unit-files 로 listing 


전체 로그 보기

journalctl -xef





0 4 * * * /usr/bin/find /home/xxxxx/log/ -maxdepth 1 -type f -mtime +6   | /usr/bin/xargs rm -rf



http://askubuntu.com/questions/168280/how-do-i-grant-sudo-privileges-to-an-existing-user


sudo usermod -a -G sudo <username>


       -a, --append

           Add the user to the supplementary group(s). Use only with the -G option.


       -G, --groups GROUP1[,GROUP2,...[,GROUPN]]]

           A list of supplementary groups which the user is also a member of. Each group is separated from the next by a comma, with no

           intervening whitespace. The groups are subject to the same restrictions as the group given with the -g option.


           If the user is currently a member of a group which is not listed, the user will be removed from the group. This behaviour can be

           changed via the -a option, which appends the user to the current supplementary group list.






useradd -U -s /bin/bash -m <username>


       -U, --user-group

           Create a group with the same name as the user, and add the user to this group.


           The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in /etc/login.defs.



       -s, --shell SHELL

           The name of the user's login shell. The default is to leave this field blank, which causes the system to select the default login shell

           specified by the SHELL variable in /etc/default/useradd, or an empty string by default.



       -m, --create-home

           Create the user's home directory if it does not exist. The files and directories contained in the skeleton directory (which can be

           defined with the -k option) will be copied to the home directory.


           By default, if this option is not specified and CREATE_HOME is not enabled, no home directories are created.





ref : http://www.linuxlab.co.kr/docs/00-05-2.htm



망내 아이피 검색

    # nmap -sP 192.168.7.0/24
    Starting nmap V. 2.12 by Fyodor (fyodor@dhp.com, www.insecure.org/nmap/)
    Host  (192.168.7.11) appears to be up.
    Host  (192.168.7.12) appears to be up.
    Host  (192.168.7.76) appears to be up.
    Nmap run completed -- 256 IP addresses (3 hosts up) scanned in 1 second


** Port Scanning **

    # nmap -sT 192.168.7.12
    Starting nmap V. 2.12 by Fyodor 
    (fyodor@dhp.com, www.insecure.org/nmap/)
    Interesting ports on (192.168.7.12):
    Port    State       Protocol    Service
    7        open        tcp        echo
    9        open        tcp        discard
    13      open        tcp        daytime
    19      open        tcp        chargen
    21      open        tcp        ftp
    ...
    Nmap run completed -- 1 IP address (1 host up) scanned in 3 seconds


** Stealth Scanning **

    # nmap -sS 192.168.7.7
    Starting nmap V. 2.12 by Fyodor 
    (fyodor@dhp.com, www.insecure.org/nmap/)
    Interesting ports on saturnlink.nac.net 
    (192.168.7.7):
    Port    State       Protocol  Service
    21      open        tcp        ftp
    25      open        tcp        smtp
    53      open        tcp        domain
    80      open        tcp        http
    ...
    Nmap run completed -- 1 IP address (1 host up) scanned in 1 second





.svn 파일 지울때
find ./ -name '.svn' | xargs rm -rf




예)
# rpm -qf /sbin/ifenslave
iputils-20000418-6
# rpm -ql iputils
/bin/ping
/sbin/ifenslave <--- 확인 사항
/usr/sbin/arping
/usr/sbin/clockdiff
/usr/sbin/ping6
/usr/sbin/rdisc
/usr/sbin/tracepath
/usr/sbin/tracepath6
/usr/sbin/traceroute6
/usr/share/doc/iputils-20000418
/usr/share/doc/iputils-20000418/README
/usr/share/doc/iputils-20000418/README.ifenslave
/usr/share/doc/iputils-20000418/RELNOTES
/usr/share/man/man8/arping.8.gz
/usr/share/man/man8/clockdiff.8.gz
/usr/share/man/man8/in.rdisc.8.gz
/usr/share/man/man8/ping.8.gz
/usr/share/man/man8/tracepath.8.gz
#
ls 칼라 설정 (ls color setting )
http://kldp.org/node/57633

grep 문자열 -R

grep nis_clone `find . -name "*.cpp"`

find ./ -name *.cpp -exec grep "nis_clone" '{}' \; -print



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