시스템 만물상

$ sed -i 's/$/문자열/g' 파일

$ sed 's/[^a-z,A-Z,0-9]//g'` file.txt

$ grep -o '[0-9]' file.txt    # 1자리씩 추출

$ grep -o '[0-9]*' file.txt    # 1자리 이상의 숫자 추출

$ echo syslog12 | sed 's/[^0-9]//g'

$ sudo yum install xinetd

$ vi /etc/xinetd.d/rsync

disable = no # yes에서 no로 변경

$ sudo service xinetd restart

[data]

path = /data

uid = root

gid = root

read only = no

hosts allow = 172.16.1.31

max connections = 5

timeout = 600

hosts allow = IP, IP, IP   # 여러개 할당

hosts allow = IP/mask  # 대역으로 할당

$ rsync -avz /test/backup/ HOST_IP::test

$ vgcreate test_vg /dev/sda

$ lvcreate -l 100%FREE -n test1 test_vg

$ mkfs.ext4 /dev/test_vg/test1

$ pvcreate /dev/sdb

$ vgextend test_vg /dev/sdb

$ lvextend -l 100%VG /dev/test_vg/test1

옵션은 소문자 엘

$ resize2fs -f /dev/test_vg/test1

$ lvcreate --extents 100%FREE -n lv_name vg_name

hello

hellohello

hellohellohello

$ tr o 5 < hello.txt

hell5

hell5hell5

hell5hell5hell5

$ tr -d '\n' < hello.txt

hellohellohellohellohellohello

$ tr a-z A-Z < hello.txt

HELLO

HELLOHELLO

HELLOHELLOHELLO

MySQL Error : MySQL server has gone away                        

Error Number  : 2006

[mysqld]

max_allowed_packet = 128M

$ find / ! \( -path /etc -prune \) -name "*.conf"

$ find / ! \( \( -path /etc -o -path /var \) -prune \) -name "*.conf"