Useful commands collection

1. Shell
2. Docker
3. Git
4. gcc/g++
5. grep

Shell

이하 directory 중에서 파일 및 폴더 찾기

find $HOME -type d -name "<dir_name>"
find $HOME -type f -name "<file_name>"

• -iname for case insensitive search
• 2>/dev/null at the end to avoid messages.(not have permission to read...)

locate can also be used

프로세스 찾아서 킬하기

ps -aid ??| grep {} kill -9 <pid_number>

특정한 string of text를 가지고 있는 파일 찾기

grep -rnw '/path/to/somewhere/' -e 'pattern'

• -r, -R are recursive, but -R traverse the entire tree correctly while -r is depth first and stop with first search
• -i for ignoring case
• -n is line number
• -w match the whole word
• -l just give the file name of matching files
• also `

특정한 text를 찾아서 출력하기

grep -wRT "text"

• -T: make tabs line up (if needed)

vim: ctags 를 이용해서 클래스 및 함수의 definition 찾기

• ctags 설치
• 분석하고 싶은 directory에서 ctags -R
• vim ~/.vimrc set tags = /directory of tags/tags
• 찾을 때, vi -t "~"
• Ctrl-], g-],뒤로가기: ctrl-t

Reference

Docker

docker container ls docker run

[pull docker image]

docker pull [OPTIONS] NAME[:TAG|@DIGEST]

예시 : docker pull ubuntu:18.04

[docker build와 docker run의 차이] build는 container 로부터 image를 만드는 것이고, run은 image로부터 container를 만드는 것이다.

[docker run 예시]

docker run -pid 80:80 --name test ubuntu:18.04 /bin/bash

docker attach test

[파일 공유]

docker run -dit -p 5000:80 -v ~/<host_directory>:<directory_in_container> --name style-transfer ubuntu:18.04 /bin/bash

gcc/g++

Include include/ when compiling

g++ -iquote include_dir <*.cc>

g++ -I include_dir

gcc -Wall

gcc -Wall enables all compiler's warning messages. This option should always be used, in order to generate better code.

Makefile error

(.text+0x20): undefined reference to 'main'

Misc

emerge specific version

emerge y <package>

search for available package versions in the tree

eqery y <package>

Git

[Unstage staged file] git restore --staged <file_name> \