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linux 4 min read 4.3 KB Raw Markdown
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Linux command

Linux

  • 1991 Linus Torvalds
  • mimic of Unix
  • for pc

Basic commands

basic commands mac windows
change directory cd cd
current directory pwd cd
list files ls, ll dir
list files info ls -l dir
view file content cat filename type filename
open site open http://www.naver.com explorer http://www.naver.com
edit file nano filename notepad filename

File extract 1 line

text
sed -n '3p' file

# Here's another:
head -n 3 file | tail -n 1

File Encoding

  • 확인 file -bi filename

File opened count

  • lsof | wc -l

inode file rm (too long file name)

text
ls -il
find . -inum 782263 -exec rm -i {} \;

nobody 소유의 폴더 찾기

text
find . -type d  -user nobody

심볼릭 링크 찾기

text
find . -type l

Port check

  • lsof -t -i:3000 # pid

  • lsof -i tcp:3000 # process

  • 열린 포트 확인

sh
lsof -i -nP | grep LISTEN | awk '{print $(NF-1)" "$1}' | sort -u
*:27017 mongod
*:8082 node
  • 원격 열린 포트 확인
sh
# dest
nc -l -p 7555 > myfile.txt
# mac
nc -l 7555 > myfile.txt

# source
nc 172.31.95.135 7555 < myfile.txt

LC_CTYPE warning

  • /etc/environment
sh
LANG=en_US.utf-8
LC_ALL=en_US.utf-8

change file encoding

sh
iconv -f euc-kr -t utf-8 kimchi.txt > kimchi_utf8.txt

multi files

sh
mkdir utf8
for file in *.csv; do
    iconv -f euc-kr -t utf-8 "$file" > "utf8/${file%.csv}.utf8.csv"
done

date

sh
date '+%Y%m%d %H%M%S' # today
date -v-3d '+%Y%m%d %H%M%S' # 1 days before
# or
date -d "3days ago" '+%Y-%m-%d %H' # bash

Timezone

  • ~/.bash_profile
sh
# .bash_profile
export TZ='Asia/Seoul';
  • for cron
sh
sudo cp -p /usr/share/zoneinfo/Asia/Seoul /etc/localtime
sudo service crond restart

sudo

sh
vi /etc/sudoers

text
## Allows people in group wheel to run all commands
# %wheel        ALL=(ALL)       ALL
%dev    ALL=(ALL)       ALL

VGA 확인

sh
sudo dnf install pciutils
lspci | grep -i vga

file filter

sh
find . -type f | egrep "gif$|jpg$|jpeg$|svg$|png$|webp$" | wc -l

archive filtered list containing spaces in file name

sh
find . -type f | grep -v list_files |egrep "php$|html$|htm$|js$|css$|inc$" > list.txt
tar cvfz text.tgz -T list.txt

find . -type f | grep -v list_files |egrep "gif$|jpg$|jpeg$|svg$|png$|ico$" > list_img.txt
tar cvfz img.tgz -T list_img.txt

find and remove

sh
find . -name .DS_Store | xargs rm
# to handle spaces in filenames
find . -name .DS_Store -print0 | xargs -0 rm

Process 확인

sh
ps -ef | grep httpd
ps x -o  "%p %r %c"
  • group process kill
sh
ps -ef | grep httpd
kill -TERM -- -22590
  • process id
sh
pgrep -f java

htop

sh
sudo dnf -y install htop

sh
htop
htop -p "$(pgrep -vfd, 'java|python')"

dust

sh
wget https://github.com/bootandy/dust/releases/download/v1.1.1/dust-v1.1.1-x86_64-unknown-linux-gnu.tar.gz
tar xvfz dust-v1.1.1-x86_64-unknown-linux-gnu.tar.gz
sudo mv dust-v1.1.1-x86_64-unknown-linux-gnu/dust /usr/local/bin
rm -rf dust-v1.1.1-x86_64-unknown-linux-gnu*
sudo dust /

sh
dust -h

ls for second

sh
ls -la --time-style=full-iso

Mail

sendmail

sh
sudo dnf install sendmail -y
echo -e "Subject: Terminal Email Send\n\nEmail Content line 1\nEmail Content line 2" > content
sendmail [email protected] < content

mutt

mail

other topics

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