Deep dive into Kernel

file="/home/user/myfile.txt" # basename filename=$(basename "$file") echo "basename: $filename" 결과값: basename: myfile.txt

find . -type d -name __pycache__ | xargs rm -rf

한줄로 해결하는 사설 인증서 만들기 명령어 openssl req -x509 -nodes -newkey rsa:4096 -keyout server.key -out server.crt -days 365 -subj "/C=KR/ST=Seoul/L=Seoul/O=SpaceONE/OU=DEV/CN=DEV/emailAddress=admin@spaceone.dev"

rc.local 을 활용하여 시작 스크립트를 실행할 수 있다. 그 중에서 tmux session을 열고 명령어를 실행하는 방법 /etc/rc.local #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. /root/start_kube.sh exit 0 /root/start_kube.sh 스크립트 #!/bin/sh # starting new tmux session with name 'kube' including one window called '..

shift is a bash built-in which kind of removes arguments in beginning of the argument list. [son@test]$ ./test_shift.sh a b c d-d a -d b -d c -d d [son@ test]$ cat test_shift.sh#! /bin/bash for i in `seq 1 $#`; do DOMAIN="$DOMAIN -d $1" shift 1done echo $DOMAIN $# = number of arguments. Answer is 3 $@ = what parameters were passed. Answer is 1 2 3 $? = was last command successful. Answer is 0 wh..

for i in ${DEV_LIST[@]};do echo $idone #!/bin/bash # define array # name server names FQDN NAMESERVERS=("ns1.nixcraft.net." "ns2.nixcraft.net." "ns3.nixcraft.net.") # get length of an array tLen=${#NAMESERVERS[@]} # use for loop read all nameservers for (( i=0; i

When you want to list all fires at directory for file in /*doecho $filedone

formatcat

bash 스크립트에서 set 명령어 뒤에 오는 다양한 옵션들이 존재한다. setset [--abefhkmnptuvxBCEHPT] [-o option-name] [argument …] set [+abefhkmnptuvxBCEHPT] [+o option-name] [argument …] 예를 들어 set -x 를 하면 Print a trace of simple commands, for commands, case commands, select commands, and arithmetic for commands and their arguments or associated word lists after they are expanded and before they are executed. The value of t..

bash $_는 last argument를 의미한다.