[Linux] Shell Script ๊ธฐ์ดˆ ๋ฌธ๋ฒ• - ๋ณ€์ˆ˜ ์‚ฌ์šฉํ•˜๊ธฐ(1)

2025. 4. 26. 00:55ยทLinux

Shell Script๋ž€?

Unix๋‚˜ Linux ๋˜๋Š” POSIX Portable Operating System Interface๋ฅผ ์ง€์›ํ•˜๋Š” ์šด์˜์ฒด์ œ์ธ macOS ๋“ฑ์—์„œ ์ผ๋ฐ˜์ ์œผ๋กœ ์‚ฌ์šฉํ•˜๋Š” ๋ช…๋ น์–ด๋“ค๊ณผ if, for์™€ ๊ฐ™์€ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์ ์ธ ์š”์†Œ๋กœ ์ด๋ฃจ์–ด์ง„ ์ธํ„ฐํ”„๋ฆฌํ„ฐ ๊ธฐ๋ฐ˜์˜ ์Šคํฌ๋ฆฝํŠธ ์–ธ์–ด.

Shell Script ์ž‘์„ฑ ๋ฐ ์‹คํ–‰

์ผ๋ฐ˜์ ์œผ๋กœ ์…ธ ์Šคํฌ๋ฆฝํŠธ ํŒŒ์ผ์„ ๋งŒ๋“ค ๋•Œ๋Š” sh ํ™•์žฅ์ž๋ฅผ ์‚ฌ์šฉ. ๊ทธ๋ฆฌ๊ณ  #!/bin/bash๋ฅผ ์‹œ์ž‘ํ•  ๋•Œ ์ž‘์„ฑํ•˜์—ฌ ์…ธ ์Šคํฌ๋ฆฝํŠธ์ž„์„ ๋ช…์‹œ.

Shell Script ์‹คํ–‰ํ•˜๋Š” ๋ฐฉ๋ฒ•์€ 2๊ฐ€์ง€. ์ฒซ๋ฒˆ์งธ๋Š” sh ๋ช…๋ น์–ด๋ฅผ ์ด์šฉํ•˜์—ฌ ์‹คํ–‰ํ•˜๋Š” ๋ฐฉ๋ฒ•.

$ sh myshell.sh

๋‘ ๋ฒˆ์งธ ๋ฐฉ๋ฒ•์€ ์ƒ์„ฑํ•œ ์Šคํฌ๋ฆฝํŠธ์— ์‹คํ–‰ ๊ถŒํ•œ์„ ์ฃผ๊ณ  ์ง์ ‘ ์Šคํฌ๋ฆฝํŠธ๋ฅผ ์‹คํ–‰ํ•˜๋Š” ๋ฐฉ๋ฒ•.

$ chmod +x myshell.sh
$ ./myshell.sh

shell script๋ฅผ ๋งŒ๋“ค์–ด ์‚ฌ์šฉํ•˜๋Š” ์ด์œ ๋Š” ๊ณ„์†ํ•ด์„œ ์žฌ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๊ณ  ๋‹ค๋ฅธ ์Šคํฌ๋ฆฝํŠธ๋ฅผ ๋งŒ๋“ค ๋•Œ ์ฐธ์กฐํ•  ์ˆ˜ ์žˆ๊ธฐ ๋•Œ๋ฌธ.

๋ณ€์ˆ˜ ์‚ฌ์šฉํ•˜๊ธฐ

๋ณ€์ˆ˜ ์„ ์–ธ

์Šคํฌ๋ฆฝํŠธ์šฉ ๋ณ€์ˆ˜๋Š” ์ผ๋ฐ˜์ ์œผ๋กœ ๋ณ€์ˆ˜๋ช…์„ ์„ ์–ธํ•œ ํ›„ ๋ฌธ์ž์—ด์„ ์ €์žฅํ•˜๋ฉด ๋ฌธ์ž์—ด์ด ์ €์žฅ๋˜๊ณ  ์ˆซ์ž๋ฅผ ์ €์žฅํ•˜๋ฉด ์ˆซ์ž๊ฐ€ ์ €์žฅ๋จ. ๋”ฐ๋ผ์„œ ํŠน๋ณ„ํ•œ ๋ณ€์ˆ˜ ํƒ€์ž…์ด ํ•„์š”ํ•˜์ง€ ์•Š์Œ. ๊ฐ€์žฅ ๊ธฐ๋ณธ์ ์ธ ๋ณ€์ˆ˜ ์„ ์–ธ ๋ฐฉ๋ฒ•์€ ์‚ฌ์šฉํ•˜๊ณ ์ž ํ•˜๋Š” ๋ช…๋ น์–ด ์ „์— ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธํ•˜๊ณ  ํ•ด๋‹น ๋ณ€์ˆ˜์— ํ•„์š”ํ•œ ๊ฐ’์„ ์ €์žฅํ•˜๋Š” ๊ฒƒ.
๊ธฐ๋ณธ ๋ณ€์ˆ˜ ์„ ์–ธ - ๋ฌธ์ž์—ด ์ถœ๋ ฅํ•˜๊ธฐ

#!/bin/bash

language="Korean"

echo "I can speak $language"
$ sh myshell.sh
I can speak Korean

๊ธฐ๋ณธ ๋ณ€์ˆ˜ ์„ ์–ธ - ๋””๋ ‰ํ† ๋ฆฌ ์ƒ์„ฑํ•˜๊ธฐ

#!/bin/bash

language="Korea English Japan"

mkdir $language
$ sh make_directory.sh
$ ls -l
drwxr-xr-x 2 lucy lucy 4096 Apr 25 19:34 English
drwxr-xr-x 2 lucy lucy 4096 Apr 25 19:34 Japan
drwxr-xr-x 2 lucy lucy 4096 Apr 25 19:34 Korea

๋ณ€์ˆ˜์˜ ์ข…๋ฅ˜

๋ณ€์ˆ˜์—๋Š” ๋‹จ์ˆœํ•˜๊ฒŒ ์„ ์–ธ๋งŒ ํ•ด์„œ ์“ฐ๋Š” ๋ณ€์ˆ˜๋„ ์žˆ์ง€๋งŒ ํ•จ์ˆ˜๋ฅผ ํ•จ๊ป˜ ์‚ฌ์šฉํ•˜๋ฉด์„œ ํ•จ์ˆ˜ ๋‚ด์—์„œ๋งŒ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ๋ณ€์ˆ˜, ํ•จ์ˆ˜ ๋ฐ–์—์„œ๋„ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ๋ณ€์ˆ˜, ํ•จ์ˆ˜์— ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ๋ณ€์ˆ˜๋ฅผ ๋„˜๊ธธ ๋•Œ ์‚ฌ์šฉํ•˜๋Š” ๋ณ€์ˆ˜ ๋“ฑ ์—ฌ๋Ÿฌ ์ข…๋ฅ˜์˜ ๋ณ€์ˆ˜๋“ค์ด ๋งŽ์Œ. ๋˜ํ•œ, ์‹œ์Šคํ…œ์—์„œ ์‹œ์Šคํ…œ์„ ์œ„ํ•ด ๋ฏธ๋ฆฌ ํ• ๋‹น๋œ ๋ณ€์ˆ˜๋“ค์ด ์กด์žฌํ•จ. ๊ทธ๋Ÿฐ ๋ณ€์ˆ˜๋“ค์„ ์šฐ๋ฆฌ๋Š” ์˜ˆ์•ฝ๋ณ€์ˆ˜ ํ˜น์€ ํ™˜๊ฒฝ๋ณ€์ˆ˜๋ผ ๋ถ€๋ฆ„.
ํ•จ์ˆ˜
ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ์ด์œ ๋Š” ์Šคํฌ๋ฆฝํŠธ๋ฅผ ์žฌ์‚ฌ์šฉํ•˜๊ธฐ ์œ„ํ•จ์ด๋ฉฐ ์Šคํฌ๋ฆฝํŠธ๋ฅผ ์žฌ์‚ฌ์šฉํ•จ์œผ๋กœ์จ ์Šคํฌ๋ฆฝํŠธ์˜ ์ค„ ์ˆ˜๋ฅผ ์ค„์—ฌ์ฃผ๊ณ  ์ข€ ๋” ํšจ์œจ์ ์œผ๋กœ ์Šคํฌ๋ฆฝํŠธ๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ๊ธฐ ๋•Œ๋ฌธ.

#!/bin/bash

function print() {

    echo $1

}

print "I can speak Korean"

ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•  ๋•Œ๋Š” ํ•จ์ˆ˜์— ํ•„์š”ํ•œ ํŒŒ๋ผ๋ฏธํ„ฐ์™€ ํ•จ๊ป˜ ํ•ด๋‹น ํ•จ์ˆ˜๋ฅผ ํ˜ธ์ถœ.

$ bash myshell.sh
I can speak Korean 

์ด ํ•จ์ˆ˜์˜ ๊ฒฝ์šฐ bash ๋ฌธ๋ฒ•์œผ๋กœ sh ๋ช…๋ น์–ด๋กœ ์‹คํ–‰๋˜์ง€ ์•Š์•„์„œ bash๋กœ ์‹คํ–‰.
์ „์—ญ๋ณ€์ˆ˜

#!/bin/bash

language="Korean"

function print() {

    echo "I can speak $language"
}

print
$ bash myshell.sh
I can speak Korean

์ง€์—ญ๋ณ€์ˆ˜

#!/bin/bash

language="Korean"                                                                                                                 function learn() {

        local learn_language="English"
        echo "I am learning $learn_language"

}

function print() {

        echo "I can speak $1"

}

learn
print $language
print $learn_language
$ bash myshell.sh
I am learning English
I can speak Korean
I can speak   # learn์˜ ์ง€์—ญ๋ณ€์ˆ˜๋กœ learn_language ๊ฐ’์„ ์ถœ๋ ฅํ•  ์ˆ˜ ์žˆ์ง€๋งŒ print์—์„œ๋Š” ์ถœ๋ ฅ ์•ˆ ๋จ.

์˜ˆ์•ฝ๋ณ€์ˆ˜ ๋ฐ ํ™˜๊ฒฝ๋ณ€์ˆ˜
์‹œ์Šคํ…œ์„ ์œ„ํ•ด ์‚ฌ์ „์— ๋ฏธ๋ฆฌ ์‹œ์Šคํ…œ์—์„œ ์‚ฌ์šฉํ•˜๊ณ  ์žˆ๋Š” ๋ณ€์ˆ˜๋“ค.
์‚ฌ์ „์— ์‚ฌ์šฉํ•˜๊ณ  ์žˆ๋Š” ๋ณ€์ˆ˜์ด๊ธฐ ๋•Œ๋ฌธ์— ์˜ˆ์•ฝ ๋ณ€์ˆ˜ํ•˜๊ณ  ํ•˜๊ธฐ๋„ ํ•˜๊ณ , ์‹œ์Šคํ…œ ํ™˜๊ฒฝ์„ ์œ„ํ•œ ๋ณ€์ˆ˜๋“ค์ด๊ธฐ ๋•Œ๋ฌธ์— ํ™˜๊ฒฝ๋ณ€์ˆ˜๋ผ๊ณ ๋„ ํ•จ.

๋ณ€์ˆ˜๋ช… ์„ค๋ช…
HOME ์‚ฌ์šฉ์ž์˜ ํ™ˆ ๋””๋ ‰ํ† ๋ฆฌ
PATH ์‹คํ–‰ ํŒŒ์ผ์„ ์ฐพ์„ ๋””๋ ‰ํ† ๋ฆฌ ๊ฒฝ๋กœ
FUNCNAME ํ˜„์žฌ ํ•จ์ˆ˜ ์ด๋ฆ„
LANG ํ”„๋กœ๊ทธ๋žจ ์‚ฌ์šฉ ์‹œ ๊ธฐ๋ณธ์œผ๋กœ ์ง€์›๋˜๋Š” ์–ธ์–ด
PWD ์‚ฌ์šฉ์ž์˜ ํ˜„์žฌ ์ž‘์—… ์ค‘์ธ ๋””๋ ‰ํ† ๋ฆฌ
TERM ๋กœ๊ทธ์ธ ํ„ฐ๋ฏธ๋„ ํƒ€์ž…
SHELL ๋กœ๊ทธ์ธํ•ด์„œ ์‚ฌ์šฉํ•˜๋Š” ์…ธ
USER ์‚ฌ์šฉ์ž ์ด๋ฆ„
USERNAME ์‚ฌ์šฉ์ž ์ด๋ฆ„
GROUP ์‚ฌ์šฉ์ž ๊ทธ๋ฃน(/etc/passwd ๊ฐ’์„ ์ถœ๋ ฅ)
DISPLAY X ๋””์Šคํ”Œ๋ ˆ์ด ์ด๋ฆ„
COLUMNS ํ˜„์žฌ ํ„ฐ๋ฏธ๋„์ด๋‚˜ ์œˆ๋„์šฐ ํ„ฐ๋ฏธ๋„์˜ ์ปฌ๋Ÿผ ์ˆ˜
LINES ํ„ฐ๋ฏธ๋„์˜ ๋ผ์ธ ์ˆ˜
PS1 ๊ธฐ๋ณธ ํ”„๋กฌํ”„ํŠธ ๋ณ€์ˆ˜
PS2 ๋ณด์กฐ ํ”„๋กฌํ”„ํŠธ ๋ณ€์ˆ˜(๊ธฐ๋ณธ๊ฐ’:>), ๋ช…๋ น์„ "\"๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๋ช…๋ น ํ–‰ ์—ฐ์žฅ ์‹œ ์‚ฌ์šฉ๋จ
PS3 ์…ธ ์Šคํฌ๋ฆฝํŠธ์—์„œ select ์‚ฌ์šฉ ์‹œ ํ”„๋กฌํ”„ํŠธ ๋ณ€์ˆ˜
PS4 ์…ธ ์Šคํฌ๋ฆฝํŠธ ๋””๋ฒ„๊น… ๋ชจ๋“œ์˜ ํ”„๋กฌํ”„ํŠธ ๋ณ€์ˆ˜(๊ธฐ๋ณธ๊ฐ’: +)
BASH BASH ์‹คํ–‰ ํŒŒ์ผ ๊ฒฝ๋กœ
BASH_VERSION ์„ค์น˜๋œ BASH ๋ฒ„์ „
BASH_ENV ์Šคํฌ๋ฆฝํŠธ ์‹คํ–‰ ์‹œ BASH ์‹œ์ž‘ ํŒŒ์ผ์„ ์ฝ์„ ์œ„์น˜ ๋ณ€์ˆ˜
HISTFILE history ํŒŒ์ผ ๊ฒฝ๋กœ
HISTFILESIZE history ํŒŒ์ผ ํฌ๊ธฐ
HISTSIZE history ์ €์žฅ๋˜๋Š” ๊ฐœ์ˆ˜
HOSTNAME ํ˜ธ์ŠคํŠธ ์ด๋ฆ„
HOSTTYPE ์‹œ์Šคํ…œ ํ•˜๋“œ์›จ์–ด ์ข…๋ฅ˜
MACHTYPE ๋จธ์‹  ์ข…๋ฅ˜(HOSTTYPE๊ณผ ๊ฐ™์€ ์ •๋ณด์ง€๋งŒ ์กฐ๊ธˆ ๋” ์ƒ์„ธํ•˜๊ฒŒ ํ‘œ์‹œ๋จ)
MAIL ๋ฉ”์ผ ๋ณด๊ด€ ๊ฒฝ๋กœ
LOGNAME ๋กœ๊ทธ์ธ ์ด๋ฆ„
TMOUT 0์ด๋ฉด ์ œํ•œ์ด ์—†์œผ๋ฉฐ time ์‹œ๊ฐ„ ์ง€์ • ์‹œ ์ง€์ •ํ•œ ์‹œ๊ฐ„ ์ดํ›„ ๋กœ๊ทธ์•„์›ƒ
SECONDS ์Šคํฌ๋ฆฝํŠธ๊ฐ€ ์‹คํ–‰๋œ ์ดˆ ๋‹จ์œ„ ์‹œ๊ฐ„
UID ์‚ฌ์šฉ์ž UID
OSTYPE ์šด์˜์ฒด์ œ ์ข…๋ฅ˜

์œ„์น˜ ๋งค๊ฐœ๋ณ€์ˆ˜
์Šคํฌ๋ฆฝํŠธ ์ˆ˜ํ–‰ ์‹œ ํ•จ๊ป˜ ๋„˜์–ด์˜ค๋Š” ํŒŒ๋ผ๋ฏธํ„ฐ๋ฅผ ์˜๋ฏธ. ์•„๋ž˜ ํ‘œ๋Š” ์œ„์น˜ ๋งค๊ฐœ๋ณ€์ˆ˜์˜ ์ข…๋ฅ˜๋ฅผ ์ •๋ฆฌํ•œ ๊ฒƒ. ๋Œ€์ฒด์ ์œผ๋กœ $1..$3๊นŒ์ง€ ๊ฐ€์žฅ ๋งŽ์ด ์‚ฌ์šฉ.

๋งค๊ฐœ๋ณ€์ˆ˜ ์„ค๋ช…
$0 ์‹คํ–‰๋œ ์Šคํฌ๋ฆฝํŠธ ์ด๋ฆ„
$1 $1 $2 $3..${10} ํŒŒ๋ผ๋ฏธํ„ฐ ์ˆœ์„œ๋Œ€๋กœ ๋ฒˆํ˜ธ๊ฐ€ ๋ถ€์—ฌ๋˜๋ฉฐ, 10๋ฒˆ์งธ๋ถ€ํ„ฐ๋Š” "{}"๋กœ ๊ฐ์‹ธ์ค˜์•ผ ํ•จ
$* ์ „์ฒด ์ธ์ž ๊ฐ’
$@ ์ „์ฒด ์ธ์ž ๊ฐ’($*๋Š” ๋™์ผํ•˜์ง€๋งŒ ์Œ๋”ฐ์˜ดํ‘œ๋กœ ๋ณ€์ˆ˜๋ฅผ ๊ฐ์‹ธ๋ฉด ๋‹ค๋ฅธ ๊ฒฐ๊ณผ ๋‚˜์˜ด)
$# ๋งค๊ฐœ๋ณ€์ˆ˜์˜ ์ด ๊ฐœ์ˆ˜

 
$*๊ณผ  $@
$*๊ณผ $@๋ฅผ for์™€ ํ•จ๊ป˜ ์‚ฌ์šฉํ•  ๋•Œ ํฐ ๋”ฐ์˜ดํ‘œ๋ฅผ ์•ž๋’ค๋กœ ์‚ฌ์šฉํ–ˆ์„ ๊ฒฝ์šฐ์™€ ๊ทธ๋ ‡์ง€ ์•Š์„ ๊ฒฝ์šฐ์˜ ์ฐจ์ด์ ์„ ํ™•์‹คํ•˜๊ฒŒ ์•Œ ์ˆ˜ ์žˆ์Œ.
$*์„ ์ด์šฉํ•ด for๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ํฐ๋”ฐ์˜ดํ‘œ์™€ ์ƒ๊ด€์—†์ด ์ŠคํŽ˜์ด์Šค๋ฅผ ๊ธฐ์ค€์œผ๋กœ ๋ฌธ์ž์—ด์„ ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ์ธ์‹.

#!/bin/bash

for language in $*
do
	echo "I can speak $language"
done

# $*๋งŒ ์‚ฌ์šฉํ–ˆ์„ ๊ฒฝ์šฐ ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ๋ชจ๋‘ ๊ฐœ๋ณ„๋กœ ์ธ์‹.
$ sh mylanguage.sh Korean English "Japanese Chinese"
I can speak Korean
I can speak English
I can speak Japanese
I can speak Chinese

$@๋ฅผ ์‚ฌ์šฉํ–ˆ์„ ๋•Œ๋„ $*์„ ์‚ฌ์šฉํ–ˆ์„ ๋•Œ์™€ ๋™์ผํ•จ์„ ์•Œ ์ˆ˜ ์žˆ์Œ.

#!/bin/bash

for language in $@
do
	echo "I can speak $language"
done
$ sh mylanguage.sh Korean English "Japanese Chinese"
I can speak Korean
I can speak English
I can speak Japanese
I can speak Chinese

ํฐ๋”ฐ์˜ดํ‘œ์™€ ํ•จ๊ป˜ $*์„ ์‚ฌ์šฉํ•˜๋ฉด ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ๊ฐœ๋ณ„๋กœ ์ธ์‹ํ•˜๋Š” ๊ฒƒ์ด ์•„๋‹ˆ๋ผ ํ•˜๋‚˜์˜ ๋ฌธ์ž์—ด๋กœ ์ธ์‹ํ•จ.

#!/bin/bash

for language in "$*"
do
	echo "I can speak $language"
done
$ sh mylanguage.sh Korean English "Japanese Chinese"
I can speak Korean English Japanese Chinese

ํฐ ๋”ฐ์˜ดํ‘œ์™€ ํ•จ๊ป˜ $@๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ํฐ๋”ฐ์˜ดํ‘œ ์‚ฌ์ด์˜ ๋ฌธ์ž์—ด์„ ํ•˜๋‚˜์˜ ๋งค๊ฐœ๋ณ€์ˆ˜๋กœ ์ธ์‹ํ•จ.

#!/bin/bash

for language in "$@"
do
	echo "I can speak $language"
done
$ sh mylanguage.sh Korean English "Japanese Chinese"
I can speak Korean
I can speak English
I can speak Japanese Chinese

ํŠน์ˆ˜ ๋งค๊ฐœ๋ณ€์ˆ˜
ํ˜„์žฌ ์‹คํ–‰ ์ค‘์ธ ์Šคํฌ๋ฆฝํŠธ๋‚˜ ๋ช…๋ น์–ด์˜ ํ”„๋กœ์„ธ์Šค ID๋ฅผ ํ™•์ธํ•˜๊ฑฐ๋‚˜ ๋ฐ”๋กœ ์•ž์—์„œ ์‹คํ–‰ํ•œ ๋ช…๋ น์–ด๋‚˜ ํ•จ์ˆ˜ ๋˜๋Š” ์Šคํฌ๋ฆฝํŠธ ์‹คํ–‰์ด ์ •์ƒ์ ์œผ๋กœ ์ˆ˜ํ–‰๋˜์—ˆ๋Š”์ง€ ์—ฌ๋ถ€๋ฅผ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋Š” ๋ณ€์ˆ˜๋“ค.

๋งค๊ฐœ๋ณ€์ˆ˜ ์„ค๋ช…
$$ .ํ˜„์žฌ ์Šคํฌ๋ฆฝํŠธ ๋˜๋Š” ๋ช…๋ น์–ด์˜ PID
$? ์ตœ๊ทผ์— ์‹คํ–‰๋œ ๋ช…๋ น์–ด, ํ•จ์ˆ˜, ์Šคํฌ๋ฆฝํŠธ์˜ ์ข…๋ฃŒ ์ƒํƒœ
$! ์ตœ๊ทผ์— ์‹คํ–‰ํ•œ ๋ฐฑ๊ทธ๋ผ์šด๋“œ(๋น„๋™๊ธฐ) ๋ช…๋ น์˜ PID
$- ํ˜„์žฌ ์˜ต์…˜ ํ”Œ๋ž˜๊ทธ

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The Engineer, Lucy
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