Airlover 20030324 1

Unix Shell Script 2003/03/24 For SPARCS ’03 김군훈 <airlover@sparcs.kaist>

Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is shell? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Kernel Shell Program Program Program User

Bash Configuration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Environment Variable. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Shell Var. Environ. Var. export - set - env

Standard input, output, error Program1 FD Program2 FD 1 - STDOUT 0 - STDIN 2 – STDERR : : : 1 - STDOUT 0 - STDIN 2 – STDERR : : :

Redirection & Pipelining < | > Etc.. >> << <<< 2>&1 2> &> … File File Program Program

Script Examples - Start #!/bin/sh mutt telnet ara telnet ska telnet pie

Script Examples(2) – Color Table #!/usr/local/bin/bash esc="33[" echo -e " 40 41 42 43 44 45 46 47" for fore in 30 31 32 33 34 35 36 37; do line1="$fore " line2=" " for back in 40 41 42 43 44 45 46 47; do line1="${line1}${esc}${back};${fore}m 보통 ${esc}0m " line2="${line2}${esc}${back};${fore};1m 밝은 ${esc}0m " done echo -e "$line1$line2" done

Script Examples(3) – Dictionary $ sh eng_dic shell shell [LINK] 발음듣기 [INLINE] shell [ [INLINE] 雩 ] n. 1 a 조가비 (seashell); ( 굴의 ) 껍질 b ( 거북 [INLINE] 새우 [INLINE] 게 등의 ) 등딱지 , 껍데기 c ( 콩의 ) 깍지 , 꼬투리 d 시초 ( 翅 ?), 딱지 날개 e ( 번데기의 ) 외피 f ( 과일 [INLINE] 종자 등의 ) 껍질 ; [ pl. ] 카카오 껍질 (cacao shells) #!/bin/sh WORD=$* WORD=$(echo ${WORD} |od -tx1 -w1000 |head -1 |sed -e 's/^[0-9] //' -e 's/ 0a$//' -e 's/20/+/g' -e 's/ /%/g' -e 's/^/%/' |tr '[a-z]' '[A-Z]') lynx -nolist -verbose -dump http://kr.engdic.yahoo.com/result.html?p=${WORD} |grep -v "bu2.gif" |tail +14 |tac |tail +11 |tac |sed -e 's/[phon[0-9]gif] //g' -e 's/[phon[0-9]gif]//g' |less -r

Script Examples(4) – Etc. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Shell script syntax - for ,[object Object],102 Name: sparcs.kaist.ac.kr 103 Name: ara.kaist.ac.kr 104 Name: baram.kaist.ac.kr 105 Name: gurum.kaist.ac.kr 106 Name: sparcs6.kaist.ac.kr 107 Name: sparcs7.kaist.ac.kr 108 Name: sparcs8.kaist.ac.kr 109 Name: sparcs9.kaist.ac.kr 110 Name: ftp.kaist.ac.kr . . . . . . . . . . . . . . . . #!/usr/local/bin/bash for ((i=102;i<151;i++)); do data=`nslookup 143.248.234.$i 2> /dev/null| tail +4|head -1`; echo $i $data; done;

Shell script syntax(2) - if ,[object Object],$ ./diff abc abc abc abc It’s same $ ./diff abcc abcd abcc Abcd It’s different #!/bin/sh echo $1; echo $2; if [ "$1" = "$2" ]; then echo "It's same"; else echo "It's different"; fi

Shell script syntax(3) – select ,[object Object],1) Hello 2) Quit #? 1 Hello World #? 2 done #!/usr/local/bin/bash OPTIONS="Hello Quit" select opt in $OPTIONS; do if [ "$opt" = "Quit" ]; then echo done exit elif [ "$opt" = "Hello" ]; then echo Hello World else clear echo bad option fi done

Shell script syntax(4) - case ,[object Object],#!/bin/sh case $1 in all) telnet ara; telnet ska; telnet noah;; a) telnet aka;; s) telnet ska;; n) telnet noah;; esac

Shell script syntax(5) – Etc. ,[object Object],[object Object],[object Object]

Special Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Making Shell ,[object Object],[object Object],[object Object],[object Object],[object Object]

Homework ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reference ,[object Object],[object Object]

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