- 1. Bash Script Franklin 2014/06/24
2. Shell? Shell Core User Shell 3. Shell PC-DOS, MS-DOS Windows
Cmd.exe Sh / csh / bash / zsh / ... Shell Gnome shell 4. /bin/sh :
bash vs dash Ubuntu /bin/sh dash dash bash 5. Shell script Shebang:
#! shell interpreter #!/bin/sh #!/bin/bash #!/bin/python
#!/usr/bin/env python ... POSIX: the results are unspecified.
/bin/sh 6. Hello World #!/bin/bash echo "Hello World!" echo "Today
is `date +%x`" echo 'Another example is date +%x' echo, ", ', ` 7.
#!/bin/bash MONTH=`date +%m` DATE=`date +%d` echo " $MONTH $DATE "
echo " ${MONTH} ${DATE} " $MONTH ${MONTH} 8. #!/bin/bash STR="A B C
D" echo $STR echo "$STR" 9. Exercise 1 xx xx man date 10. 1
#!/bin/bash HOUR=`date +%H` MIN=`date +%M` echo " ${HOUR} ${MIN} "
11. test #!/bin/bash DAY=`date +%d` if [ ${DAY} -eq 5 ]; then echo
" " elif [ ${DAY} -ge 28 ]; then echo " ..." else echo " " fi test
, [ ], if, elif, then, -eq, -ge test if, while if 12. test ( ) :
true, ! : not -a : and, -o : or -eq, -gt, -lt, -ge, -le, -ne =, !=
= -eq -z, -n -b, -c, -d, -e, -f, -r, -w, -x man test 13. while,
until #!/bin/bash i=0 while [ $i -lt 10 ]; do echo "i=$i" let i+=1
done #!/bin/bash i=0 until [ $i -eq 10 ]; do echo "i=$i" let i+=1
done while, until 14. for #!/bin/bash for FILENAME in /usr; do echo
"$FILENAME" done #!/bin/bash for FILENAME in /usr/*; do echo
"$FILENAME" done for 15. Exercise 2 /usr/lib man test for let 16. 2
#!/bin/bash DIR=0 SYMLINK=0 EXEC=0 OTHER=0 for FILE in /usr/lib/*;
do if [ -d $FILE ]; then let DIR+=1 elif [ -x $FILE ]; then let
EXEC+=1 elif [ -L $FILE ]; then let SYMLINK+=1 else let OTHER+=1 fi
done echo "Dir:$DIR, Exec: $EXEC, SYMLINK: $SYMLINK, OTHER:$OTHER"
17. Bash Script #!/bin/bash echo "0=$0, 1=$1, 2=$2" if [ $1 =
"Good" ]; then echo "Thanks." else echo "Oops..." fi $0, $1, $2 $0:
$1: ./test.sh Good ya ./test.sh 18. Bash Script #!/bin/bash echo
"0=$0, 1=$1, 2=$2" if [ "$1" = "Good" ]; then echo "Thanks." else
echo "Oops..." fi Bash $1 parsing error 19. Bash Script 2
#!/bin/bash echo "0=$0, 1=$1, 2=$2" if [ -z "$1" ]; then echo "No
parameters." elif [ "$1" = "Good" ]; then echo "Thanks." else echo
"Oops..." fi 20. Bash Script #!/bin/bash ls -lR /usr >
/tmp/usr.list 2>&1 RET=$? if [ $RET -ne 0 ]; then echo "ls
failed." fi >, >&, $? $?: 21. > : (stdout) ls -lR /usr
> /tmp/file.list >> : ls -lR /var >> /tmp/file.list
>& : fd ls -lR /home >> /tmp/file.list 2>&1 fd:
0 stdin, 1 stdout, 2 stderr | : pipe ls -l / | grep home sed, awk,
grep 22. Exercise 3 wget ftp://goodhorse.idv.tw/tetris.sh wget, $?
man wget 23. 3 #!/bin/bash wget ftp://goodhorse.idv.tw/tetris.sh
RET=$? if [ $RET -ne 0 ]; then echo "wget failed." fi 24. Bash
Script #!/bin/bash printValue() { if [ -z "$1" ]; then echo "Empty
value" else echo "parameter=$1" fi } printValue i=0 until [ $i -eq
10 ]; do printValue $i let i+=1 done $1, $2 25. Source source
alias: . . /etc/default/locale 26. #!/bin/bash declare -i NUM
NUM=4*2 echo $NUM declare bash declare -i: -a | -A : -f : +i 27.
#!/bin/bash echo -n " " read NAME echo "Hello, $NAME." read read
NAME $NAME 28. Shell Script grep sed awk zenity / kdialog 29. grep
ps axw | grep ba.h dmesg | grep eth0 -r grep -r bash * -v: 30. awk
ps axw | awk ' { print $1 " " $5 }; ' ps axw | awk ' { if ($1 >=
4000 && $1 = 80) { print $1 " " $5 " " $6 }} ' 39. 3: ppp0
#!/bin/bash CHECK=`/sbin/ifconfig ppp0 | grep "inet addr"` if [ -z
"${CHECK}" ]; then /etc/init.d/network-manager restart fi if [
"${CHECK}z" = "z" ]; then 40.
