[Linux] Shell Script ๊ธฐ์ดˆ ๋ฌธ๋ฒ• - ์กฐ๊ฑด๋ฌธ, ๋ฐ˜๋ณต๋ฌธ

2025. 5. 21. 15:51ยทLinux

์กฐ๊ฑด๋ฌธ if, switch-case

if๋ฌธ

๊ธฐ๋ณธ ์‚ฌ์šฉ๋ฒ•

if [์ฒซ ๋ฒˆ์งธ ์กฐ๊ฑด์‹]
then
    ์ˆ˜ํ–‰๋ฌธ
elif [๋‘ ๋ฒˆ์งธ ์กฐ๊ฑด์‹]
then
    ์ˆ˜ํ–‰๋ฌธ
else
    ์ˆ˜ํ–‰๋ฌธ
fi

if, then, else, fi๋Š” ๋ฐ˜๋“œ์‹œ ๊ธฐ์ž…์„ ํ•ด์•ผ ํ•จ. ์กฐ๊ฑด์‹ ์•ž๋’ค๋กœ๋Š” ๋ฐ˜๋“œ์‹œ ๋Œ€๊ด„ํ˜ธ๋ฅผ ์‚ฌ์šฉํ•ด์•ผ ํ•˜๋ฉฐ, ๋Œ€๊ด„ํ˜ธ์™€ ์กฐ๊ฑด์‹ ์‚ฌ์ด์—๋Š” ๋ฐ˜๋“œ์‹œ ํ•œ ์นธ์˜ ์ŠคํŽ˜์ด์Šค๋ฅผ ๋‘์–ด์•ผ ํ•จ.

์กฐ๊ฑด์‹ ํƒ€์ž…

์กฐ๊ฑด์‹ ํƒ€์ž… ์„ค๋ช…
if [$๋ณ€์ˆ˜ ์—ฐ์‚ฐ์ž $๋ณ€์ˆ˜ ]; then ์ผ๋ฐ˜์ ์ธ ์กฐ๊ฑด์‹ ํƒ€์ž…์œผ๋กœ ๋‘ ๋ณ€์ˆ˜์˜ ๊ฐ’์„ ๋น„๊ตํ•  ๋•Œ ์“ฐ์ž„.
if [$๋ณ€์ˆ˜ ์—ฐ์‚ฐ์ž ์กฐ๊ฑด๊ฐ’ ]; then ์กฐ๊ฑด๊ฐ’์ด ๊ณ ์ •๋˜์–ด ์žˆ์„ ๊ฒฝ์šฐ ๋ณ€์ˆ˜์™€ ์กฐ๊ฑด๊ฐ’์„ ๋น„๊ตํ•  ๋•Œ ์‚ฌ์šฉ.
if [์—ฐ์‚ฐ์ž $๋ณ€์ˆ˜]; then ๋ณ€์ˆ˜์˜ ๊ฐ’์ด ๋ฌธ์ž์—ด์ด๊ฑฐ๋‚˜ ๋””๋ ‰ํ† ๋ฆฌ์™€ ๊ฐ™์€ ๊ฒฝ์šฐ์ผ ๋•Œ ์ฃผ๋กœ ์‚ฌ์šฉ.
if [์กฐ๊ฑด์‹] ์—ฐ์‚ฐ์ž [์กฐ๊ฑด์‹]; then ์—ฌ๋Ÿฌ ๊ฐœ์˜ ์กฐ๊ฑด์‹์„ AND๋‚˜ OR๋กœ ๋ณตํ•ฉ ์—ฐ์‚ฐํ•  ๋•Œ ์‚ฌ์šฉ.

์กฐ๊ฑด์‹์€ ๋ณ€์ˆ˜์˜ ํƒ€์ž…์ด๋‚˜ ๋ฌธ์ž์—ด ๋˜๋Š” ํŒŒ์ผ๊ณผ ๊ฐ™์€ ๊ฐ์ฒด์ง€ํ–ฅ์ด๋ƒ์— ๋”ฐ๋ผ ์‚ฌ์šฉ๋˜๋Š” ํƒ€์ž…์— ์ฐจ์ด๊ฐ€ ์žˆ์Œ. ์—ฐ์‚ฐ ์ข…๋ฅ˜์— ๋”ฐ๋ผ์„œ๋„ ์ฐจ์ด๊ฐ€ ์žˆ์„ ์ˆ˜ ์žˆ์Œ.
์กฐ๊ฑด์‹ ํƒ€์ž… - if [$๋ณ€์ˆ˜ ์—ฐ์‚ฐ์ž $๋ณ€์ˆ˜ ]; then

~$ cat if_example1.sh
#!/bin/bash

value1=10
value2=10

if [ $value1 = $value2 ]
then
        echo True
else
        echo False
fi
~$ sh if_example1.sh
True

if๋ฌธ์„ ์‚ฌ์šฉํ•  ๋•Œ ๊ฐ€์žฅ ์ผ๋ฐ˜์ ์œผ๋กœ ์‚ฌ์šฉํ•˜๋Š” ์กฐ๊ฑด์‹ ํƒ€์ž…. ๋‘ ๋ณ€์ˆ˜ ๊ฐ’์„ ๋น„๊ตํ•  ๋•Œ ์ฃผ๋กœ ์‚ฌ์šฉ.
์˜ˆ์ œ์—์„œ๋Š” ์„ธ๋ฏธ์ฝœ๋ก ์ด ์‚ฌ์šฉ๋˜์ง€ ์•Š์•˜์œผ๋‚˜ ๋‹ค์Œ ์ค„๋กœ ๋„˜๊ธธ ๊ฒฝ์šฐ์— ์‚ฌ์šฉ.
์กฐ๊ฑด์‹ ํƒ€์ž… - if [ $๋ณ€์ˆ˜ ์—ฐ์‚ฐ์ž ์กฐ๊ฑด๊ฐ’ ]; then

~$ cat if_example2.sh
#!/bin/bash

value=0

if [ $value = 0 ]
then
        echo True
else
        echo False
fi
~$ sh if_example2.sh
True

์กฐ๊ฑด๊ฐ’์ด ๊ณ ์ •๋˜์–ด ์žˆ์–ด ๋ณ€์ˆ˜์™€ ์กฐ๊ฑด๊ฐ’์„ ๋น„๊ตํ•  ๋•Œ ์ฃผ๋กœ ์‚ฌ์šฉ.
์กฐ๊ฑด์‹์„ ํ‘œํ˜„ํ•  ๋•Œ if๋ฌธ์˜ ์•ž๋’ค๋กœ ๋ฐ˜๋“œ์‹œ ๊ณต๋ฐฑ์„ ๋‘์–ด์•ผ ํ•จ.
์กฐ๊ฑด์‹ ํƒ€์ž… - if [ ์—ฐ์‚ฐ์ž $๋ณ€์ˆ˜ ]; then

~$ cat if_example3.sh
#!/bin/bash

value=""

if [ -z $value ] # ์—ฐ์‚ฐ์ž -z๋Š” ๋ณ€์ˆ˜์— ์ €์žฅ๋œ ๊ฐ’์˜ ๊ธธ์ด๊ฐ€ 0์ธ์ง€ ๋น„๊ต.
then
        echo True
else
        echo False
fi
~$ sh if_example3.sh
True

๋ณ€์ˆ˜๊ฐ€ ๋ฌธ์ž์—ด์ด๊ฑฐ๋‚˜ ๋””๋ ‰ํ„ฐ๋ฆฌ ๋˜๋Š” ํŒŒ์ผ๊ณผ ๊ฐ™์ด ๊ฐ์ฒดํ˜•์ผ ๋•Œ ์ฃผ๋กœ ์‚ฌ์šฉ.
์กฐ๊ฑด์‹ ํƒ€์ž… - if [ ์กฐ๊ฑด์‹ ] ์—ฐ์‚ฐ์ž [ ์กฐ๊ฑด์‹ ]; then

~$ cat if_example4.sh
#!/bin/bash

value=5

if [ $value -gt 0 ] && [ $value -lt 10 ]; then
        echo True
else
        echo False
fi
~$ sh if_example4.sh
True

์—ฌ๋Ÿฌ ๊ฐœ์˜ ์กฐ๊ฑด์‹์„ AND๋‚˜ OR์™€ ๊ฐ™์€ ๋…ผ๋ฆฌ ์—ฐ์‚ฐ์ž์— ์˜ํ•ด ๋ณตํ•ฉ ์—ฐ์‚ฐ์„ ํ•  ๊ฒฝ์šฐ์— ์ฃผ๋กœ ์‚ฌ์šฉ.

switch-case ๋ฌธ

๊ธฐ๋ณธ ์‚ฌ์šฉ๋ฒ•

case $๋ณ€์ˆ˜ in
	์กฐ๊ฑด๊ฐ’1)
    ์ˆ˜ํ–‰๋ฌธ1 ;;
    ์กฐ๊ฑด๊ฐ’2)
    ์ˆ˜ํ–‰๋ฌธ2 ;;
    ์กฐ๊ฑด๊ฐ’3)
    ์ˆ˜ํ–‰๋ฌธ3 ;;
    *)
    ์ˆ˜ํ–‰๋ฌธ4
esac

case์™€ ํ•จ๊ป˜ ๋น„๊ต ๋Œ€์ƒ์ด ๋˜๋Š” ๋ณ€์ˆ˜๋ช…์„ ์‚ฌ์šฉํ•˜๊ณ , ๋น„๊ต๋ฅผ ํ•  ์กฐ๊ฑด๊ฐ’๋ณ„๋กœ ์ˆ˜ํ–‰๋ฌธ์„ ์ž‘์„ฑํ•˜๋Š” ํ˜•์‹์œผ๋กœ ์‚ฌ์šฉ๋จ.
switch-case ๊ธฐ๋ณธ ์‚ฌ์šฉ๋ฒ• ์˜ˆ์ œ

~$ cat case-example.sh
#!/bin/bash

case $1 in
        start)
                echo "Start"
        ;;
        stop)
                echo "Stop"
        ;;
        restart)
                echo "Restart"
        ;;
        help)
                echo "Help"
        ;;
        *)
                echo "Please input sub command"
esac
~$ sh case-example.sh
Please input sub command
~$ sh case-example.sh start
Start
~$ sh case-example.sh help
Help
~$ sh case-example.sh help start # ์•ž์˜ input๋งŒ ์ธ์‹.
Help
~$ sh case-example.sh stop
Stop
~$ sh case-example.sh restart
Restart

ํ•˜๋‹จ์˜ *)์—์„œ ์ž…๋ ฅ๋ฐ›์€ ๋งค๊ฐœ๋ณ€์ˆ˜๊ฐ€ ์—†๋Š” ๊ฒฝ์šฐ ์ˆ˜ํ–‰ํ•  ๋‚ด์šฉ์„ ๋‚˜ํƒ€๋ƒ„.

๋ฐ˜๋ณต๋ฌธ for, while

for๋ฌธ

๊ธฐ๋ณธ ์‚ฌ์šฉ๋ฒ•

# ์‚ฌ์šฉ๋ฒ•1
for ๋ณ€์ˆ˜ in [๋ฒ”์œ„(๋ฆฌ์ŠคํŠธ ๋˜๋Š” ๋ฐฐ์—ด, ๋ฌถ์Œ ๋“ฑ)]
do
	๋ฐ˜๋ณตํ•  ์ˆ˜ํ–‰๋ฌธ
done

# ์‚ฌ์šฉ๋ฒ•2
for ((๋ณ€์ˆ˜=์ดˆ๊ธฐ๊ฐ’; ์กฐ๊ฑด์‹; ์ฆ๊ฐ€๊ฐ’))
do
	๋ฐ˜๋ณตํ•  ์ˆ˜ํ–‰๋ฌธ
done

์ฒซ ๋ฒˆ์งธ ์‚ฌ์šฉ๋ฒ•์€ in์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฆฌ์ŠคํŠธ๋‚˜ ๋ฐฐ์—ด๊ณผ ๊ฐ™์€ ํŠน์ • ๋ฒ”์œ„์˜ ๊ฐ’๋“ค์„ ํ•˜๋‚˜์”ฉ ๊บผ๋‚ด์–ด ๋ณ€์ˆ˜์— ์ €์žฅํ•˜๊ณ , ๋ฆฌ์ŠคํŠธ๋‚˜ ๋ฐฐ์—ด์˜ ํ•ด๋‹น ๊ฐ’์„ ๋ชจ๋‘ ์‚ฌ์šฉํ•  ๋•Œ๊นŒ์ง€ ํŠน์ • ์ˆ˜ํ–‰๋ฌธ์„ ์ฒ˜๋ฆฌํ•˜๋Š” ๋ฐฉ์‹.
๋‘ ๋ฒˆ์งธ ์‚ฌ์šฉ๋ฒ•์€ ์ดˆ๊ธฐ๊ฐ’์ด ํŠน์ • ์กฐ๊ฑด์— ํ•ด๋‹น๋  ๋•Œ๊นŒ์ง€ ๊ฐ’์„ ์ฆ๊ฐ€์‹œํ‚ค๋ฉด์„œ ํŠน์ • ์ˆ˜ํ–‰๋ฌธ์„ ๊ณ„์† ๋ฐ˜๋ณตํ•˜๋Š” ๋ฐฉ๋ฒ•. ํ•ด๋‹น๊ฐ’์„ ์—ฐ์‚ฐํ•˜๋Š” ๊ฒฝ์šฐ ์ฃผ๋กœ ์‚ฌ์šฉ.

์ฒซ ๋ฒˆ์งธ ์‚ฌ์šฉ๋ฒ• ์‚ฌ์šฉ ๋นˆ๋„๊ฐ€ ๋” ๋†’์Œ.

for๋ฌธ ์ฒซ ๋ฒˆ์งธ ์‚ฌ์šฉ๋ฒ• ์˜ˆ์ œ

~$ cat for-example1.sh
#!/bin/bash

for num in 1 2 3
do
        echo $num;
done
~$ sh for-example1.sh
1
2
3

๋ฒ”์œ„๋ฅผ ๋ณ€์ˆ˜๋กœ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ

~$ cat for-example2.sh
#!/bin/bash

numbers="1 2 3"

for num in $numbers
do
        echo $num;
done
~$ sh for-example2.sh
1
2
3

๋ฐ˜๋ณตํ•  ๊ฐ’์˜ ๋ฒ”์œ„๋ฅผ ๋ฐ”๋กœ ๋‚˜์—ดํ–ˆ๊ธฐ ๋•Œ๋ฌธ์— ๋ฒ”์œ„ ์ˆ˜์ • ๋ถˆ๊ฐ€.
๋ฐ˜๋ณตํ•  ๊ฐ’์˜ ๋ฒ”์œ„๋ฅผ ๋ณ€์ˆ˜์— ์ €์žฅํ•จ์œผ๋กœ์จ ๋ณ€์ˆ˜์˜ ๊ฐ’๋งŒ ๋ฐ”๊พธ๋ฉด ์–ธ์ œ๋“ ์ง€ ๋ฒ”์œ„ ๊ฐ’ ๋ณ€๊ฒฝ ๊ฐ€๋Šฅ.
๋ฒ”์œ„๋ฅผ ๋””๋ ‰ํ„ฐ๋ฆฌ๋กœ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ

~$ cat for-example3.sh
#!/bin/bash

for file in $HOME/*
do
        echo $file;
done
~$ sh for-example3.sh
/home/lucy/for-example1.sh
/home/lucy/for-example2.sh
/home/lucy/for-example3.sh

์…ธ ์Šคํฌ๋ฆฝํŠธ์—๋Š” ์ˆซ์ž๋‚˜ ๋ฌธ์ž์—ด ์ด์™ธ์— ๋””๋ ‰ํ„ฐ๋ฆฌ๋‚˜ ํŒŒ์ผ๊ณผ ๊ฐ™์€ ๊ฐ์ฒด๋ฅผ ๋ฒ”์œ„๋กœ ์‚ฌ์šฉ ๊ฐ€๋Šฅ.
์œ„ ์˜ˆ์ œ๋Š” ํ™ˆ ๋””๋ ‰ํ„ฐ๋ฆฌ๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” ํ™˜๊ฒฝ ๋ณ€์ˆ˜๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ํ™ˆ ๋””๋ ‰ํ„ฐ๋ฆฌ ๋‚ด์˜ ๋””๋ ‰ํ„ฐ๋ฆฌ ๋ฐ ํŒŒ์ผ ๋ชฉ๋ก์„ ๋ฒ”์œ„๋กœ ์‚ฌ์šฉ.
๋ฒ”์œ„๋ฅผ ์ค‘๊ด„ํ˜ธ๋กœ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ

~$ cat for-example4.sh
#!/bin/bash

for num in {1..5}
do
        echo $num;
done
~$ bash for-example4.sh
1
2
3
4
5
~$ sh for-example4.sh
{1..5}

์ค‘๊ด„ํ˜ธ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ์ดˆ๊ธฐ๊ฐ’๊ณผ ๋งˆ์ง€๋ง‰๊ฐ’์„ ์ž…๋ ฅํ•˜๊ณ  ์ค‘๊ฐ„์— ์ƒ๋žตํ•œ๋‹ค๋Š” ์˜๋ฏธ์˜ ..์„ ์ด์šฉํ•˜๋ฉด ๋ชจ๋“  ์ˆซ์ž๋ฅผ ๋‚˜์—ดํ•˜์ง€ ์•Š์•„๋„ ๋˜๋ฏ€๋กœ ์ข€ ๋” ํšจ์œจ์ ์œผ๋กœ ๋ฐ˜๋ณต๋ฌธ ์‚ฌ์šฉ ๊ฐ€๋Šฅ.

bash ๋ฌธ๋ฒ•์ด๋ผ์„œ sh ๋ช…๋ น์–ด๋กœ ์‹คํ–‰ํ•˜๋ฉด ์›ํ•˜๋Š” ๊ฒฐ๊ณผ๊ฐ€ ๋‚˜์˜ค์ง€ ์•Š์œผ๋ฏ€๋กœ bash ๋ช…๋ น์–ด๋กœ ์‹คํ–‰ํ•ด์•ผ ํ•จ.
~$ cat for-example5.sh
#!/bin/bash

for num in {1..10..2}
do
        echo $num;
done
lucy@5a6io:~$ bash for-example5.sh
1
3
5
7
9

์ค‘๊ด„ํ˜ธ๋ฅผ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ ์ฆ๊ฐ€๊ฐ’์ด 1์ด ์•„๋‹ˆ๋ผ ๊ทธ ์ด์ƒ์ผ ๊ฒฝ์šฐ {์ดˆ๊ธฐ๊ฐ’..์ตœ์ข…๊ฐ’..์ฆ๊ฐ€๊ฐ’}์œผ๋กœ ํ‘œํ˜„ ๊ฐ€๋Šฅ.
๋ฒ”์œ„๋ฅผ ๋ฐฐ์—ด๋กœ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ

~$ cat for-example6.sh
#!/bin/bash

array=("apple" "bannana" "pineapple")

for fruit in ${array[@]}
do
        echo $fruit;
done
~$ bash for-example6.sh
apple
bannana
pineapple

๋ฒ”์œ„๋ฅผ ๋ฐฐ์—ด๋กœ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ์—๋Š” ๋ฐฐ์—ด ์„ ์–ธ ์‹œ ๊ฐ’๊ณผ ๊ฐ’ ์‚ฌ์ด์— ์‰ผํ‘œ๋ฅผ ์‚ฌ์šฉํ•ด์„œ๋Š” ์•ˆ ๋จ.

for๋ฌธ์— ๋ฐฐ์—ด์˜ ๋ชจ๋“  ์•„์ดํ…œ์„ ๋ฒ”์œ„๋กœ ์‚ฌ์šฉํ•  ๊ฒฝ์šฐ์—๋Š” ${๋ฐฐ์—ด[@]}์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฐฐ์—ด์˜ ๋ชจ๋“  ์•„์ดํ…œ์„ ์‚ฌ์šฉํ•œ๋‹ค๊ณ  ๋ช…์‹œํ•ด ์ฃผ์–ด์•ผ ํ•จ. ์œ„์น˜ ๋งค๊ฐœ๋ณ€์ˆ˜ $@๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ๋„˜์–ด์˜ค๋Š” ๋ชจ๋“  ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ์˜๋ฏธํ•˜๋Š” ๊ฒƒ๊ณผ ๋™์ผ.

for๋ฌธ ๋‘ ๋ฒˆ์งธ ์‚ฌ์šฉ๋ฒ• ์˜ˆ์ œ

~$ cat for-example7.sh
#!/bin/bash

for ((num=0; num<3; num++))
do
        echo $num;
done
~$ bash for-example7.sh
0
1
2

((์ดˆ๊ธฐ๊ฐ’; ์กฐ๊ฑด์‹; ์ฆ๊ฐ€๊ฐ’))์œผ๋กœ ๋ฒ”์œ„๋ฅผ ํ‘œํ˜„.

while๋ฌธ

๊ธฐ๋ณธ ์‚ฌ์šฉ๋ฒ•

while [ $๋ณ€์ˆ˜1 ์—ฐ์‚ฐ์ž $๋ณ€์ˆ˜2 ]
do
	๋ฐ˜๋ณตํ•  ์ˆ˜ํ–‰๋ฌธ
done

while๋ฌธ์€ ์กฐ๊ฑด์‹์„ ๋ฐ”๋กœ ์‚ฌ์šฉ. ๋ณ€์ˆ˜์˜ ๊ฐ’์ด ํŠน์ • ์กฐ๊ฑด์— ๋งž์„ ๋•Œ๊นŒ์ง€ ๊ณ„์†ํ•ด์„œ ์ˆ˜ํ–‰๋ฌธ ๋ฐ˜๋ณต.
while๋ฌธ ์˜ˆ์ œ

cat while-example1.sh
#!/bin/bash

num=0

while [ $num -lt 3 ]
do
        echo $num
        num=$((num+1))
done
~$ sh while-example1.sh
0
1
2

๋”๋ณด๊ธฐ

์œ„ ๊ธ€์€ Bash ๊ธฐ์ค€์œผ๋กœ ์ž‘์„ฑ๋˜์—ˆ์œผ๋ฉฐ <์ฒ˜์Œ ๋ฐฐ์šฐ๋Š” ์…ธ ์Šคํฌ๋ฆฝํŠธ>๋ผ๋Š” ๋„์„œ๋ฅผ ์ฐธ๊ณ ํ–ˆ์Šต๋‹ˆ๋‹ค.

 

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