建議開頭
#!/bin/bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
export LANG="en_US.UTF-8"
註解
#user comment
定義變數與列印變數
VAR="hello world"
echo $VAR
printf "\33[1;31m"
printf "Color Version: $VAR"
printf "\33[0m\n"
正常結束
exit 0
if-else判斷式
if [ "$INPUT" == "Yes" ]; then
echo "result is Yes"
elif [ "$INPUT" == "No" ]; then
echo "result is No"
else
echo "wrong input"
fi
讀取argument
if [ ! -z "$1" ]; then
ARGS=$1
fi
echo $ARGS
檢查執行者身份
whoami_ret="$(whoami)"
if [ "$whoami_ret" != "root" ]; then
echo "This script must be run as root"
exit
fi
使用者輸入
read -p "Please input (Y/N), default is N:" ANSWER
if [ "$ANSWER" == "Y" -o "$ANSWER" == "y" ]; then
echo "result is Yes"
fi
執行指令的結果
pyOpenSSL_ret="$(rpm -q python-openssl | grep install | wc -l)"
if [ "$pyOpenSSL_ret" == "1" ]; then
echo "python-openssl is not installed, please install python-openssl"
exit
fi
類似traverse陣列
SERVER_LIST=(192.168.0.1 192.168.0.2 192.168.0.3)
for IP in ${SERVER_LIST[@]}
do
echo "IP address: $IP"
done
Switch case
case $CAR in
AUDI | audi)
echo "audi"
;;
VOLVO | volvo)
echo "volvo"
;;
BENZ | benz)
echo "benz"
;;
*)
echo "wrong role type"
exit
;;
esac
Loop
until [ "$ANSWER" == "yes" ]
do
read -p "Please input \"yes\":" ANSWER
done
i=0
while [ "$i" != "10" ]
do
i=$(($i+1))
echo $i
done
for CAR in AUDI VOLVO BENZ
do
echo ${CAR}
done
for i in $(seq 1 10)
do
echo ${i}
done
for (( i=1; i<=10; i=i+1 ))
do
echo $i
done
等候某個事件發生
FILE_EXISTED=0;
while [ $FILE_EXISTED -ne "1" ];
do
if [ -z "/root/test_file" ];then
FILE_EXISTED=1
fi
sleep 1;
done
Function
function PRINT_FUNCTION(){
echo "args is $1"
}
PRINT_FUNCTION "first_args"
參考
http://tldp.org/LDP/abs/html/
http://linux.vbird.org/linux_basic/0340bashshell-scripts.php
