linux command cheat sheet

[getElementsByName]

계정

user 확인

• /etc/passwd

awk -F: '{ print $1"\t\t"$5}' /etc/passwd

group 확인

• /etc/group

cut -d: -f1 /etc/group

group 사용자 리스트

getent group $GROUP_NAME

group 생성

groupadd $GROUP_NAME
groupadd -r $GROUP_NAME --gid $GROUP_NUMERIC_ID 

user 생성

useradd -r -u $USER_NUMERIC_ID -g $PRIMARY_GROUP_NAME -G $SUPPLYMENTARY_GROUP_NAME_LIST

계정 수정

usermod -a -G $GROUP_NAME $USER_NAME

[getElementsByName]

무한 대기 dummy

exec tail -f /dev/null

[getElementsByName]

file system size

disk free

df --human-readable

dir size

• 요약

  
  TARGET_BASE_DIR=./

du --human-readable --total --summarize $TARGET_BASE_DIR

- top 10

TARGET_BASE_DIR=./

du --human-readable $TARGET_BASE_DIR | sort --reverse --human-numeric-sort | head -10

[getElementsByName]

network

• tcpdump

  tcpdump -i any -nn host $HOST_IP