[Bash Shell] Shell学习笔记

#!/bin/bash
# Author : mozhiyan
# Copyright (c) http://see.xidian.edu.cn/cpp/linux/
# Script follows here:
echo "What is your name?"
read PERSON
echo "Hello, $PERSON"

variableName="value"

myUrl="http://see.xidian.edu.cn/cpp/linux/"
myNum=100

your_name="mozhiyan"
echo $your_name
echo ${your_name}

for skill in Ada Coffe Action Java
do
echo "I am good at ${skill}Script"
done

$echo $$

#!/bin/bash
echo "File Name: $0"
echo "First Parameter : $1"
echo "First Parameter : $2"
echo "Quoted Values: $@"
echo "Quoted Values: $*"
echo "Total Number of Parameters : $#"

#!/bin/bash
a=10
echo -e "Value of a is $a \n"

#!/bin/bash
DATE=`date`
echo "Date is $DATE"
USERS=`who | wc -l`
echo "Logged in user are $USERS"
UP=`date ; uptime`
echo "Uptime is $UP"

#!/bin/bash
val=`expr 2 + 2`
echo "Total value : $val"

#!/bin/sh
a=10
b=20
val=`expr $a + $b`
echo "a + b : $val"
val=`expr $a - $b`
echo "a - b : $val"
val=`expr $a \* $b`
echo "a * b : $val"
val=`expr $b / $a`
echo "b / a : $val"
val=`expr $b % $a`
echo "b % a : $val"
if [ $a == $b ]
then
echo "a is equal to b"
fi
if [ $a != $b ]
then
echo "a is not equal to b"
fi

#!/bin/sh
a=10
b=20
if [ $a -eq $b ]
then
echo "$a -eq $b : a is equal to b"
else
echo "$a -eq $b: a is not equal to b"
fi
if [ $a -ne $b ]
then
echo "$a -ne $b: a is not equal to b"
else
echo "$a -ne $b : a is equal to b"
fi
if [ $a -gt $b ]
then
echo "$a -gt $b: a is greater than b"
else
echo "$a -gt $b: a is not greater than b"
fi
if [ $a -lt $b ]
then
echo "$a -lt $b: a is less than b"
else
echo "$a -lt $b: a is not less than b"
fi
if [ $a -ge $b ]
then
echo "$a -ge $b: a is greater or equal to b"
else
echo "$a -ge $b: a is not greater or equal to b"
fi
if [ $a -le $b ]
then
echo "$a -le $b: a is less or equal to b"
else
echo "$a -le $b: a is not less or equal to b"
fi

#!/bin/sh
a=10
b=20
if [ $a != $b ]
then
echo "$a != $b : a is not equal to b"
else
echo "$a != $b: a is equal to b"
fi
if [ $a -lt 100 -a $b -gt 15 ]
then
echo "$a -lt 100 -a $b -gt 15 : returns true"
else
echo "$a -lt 100 -a $b -gt 15 : returns false"
fi
if [ $a -lt 100 -o $b -gt 100 ]
then
echo "$a -lt 100 -o $b -gt 100 : returns true"
else
echo "$a -lt 100 -o $b -gt 100 : returns false"
fi
if [ $a -lt 5 -o $b -gt 100 ]
then
echo "$a -lt 100 -o $b -gt 100 : returns true"
else
echo "$a -lt 100 -o $b -gt 100 : returns false"
fi

#!/bin/sh
a="abc"
b="efg"
if [ $a = $b ]
then
echo "$a = $b : a is equal to b"
else
echo "$a = $b: a is not equal to b"
fi
if [ $a != $b ]
then
echo "$a != $b : a is not equal to b"
else
echo "$a != $b: a is equal to b"
fi
if [ -z $a ]
then
echo "-z $a : string length is zero"
else
echo "-z $a : string length is not zero"
fi
if [ -n $a ]
then
echo "-n $a : string length is not zero"
else
echo "-n $a : string length is zero"
fi
if [ $a ]
then
echo "$a : string is not empty"
else
echo "$a : string is empty"
fi

#!/bin/sh
file="/var/www/tutorialspoint/unix/test.sh"
if [ -r $file ]
then
echo "File has read access"
else
echo "File does not have read access"
fi
if [ -w $file ]
then
echo "File has write permission"
else
echo "File does not have write permission"
fi
if [ -x $file ]
then
echo "File has execute permission"
else
echo "File does not have execute permission"
fi
if [ -f $file ]
then
echo "File is an ordinary file"
else
echo "This is sepcial file"
fi
if [ -d $file ]
then
echo "File is a directory"
else
echo "This is not a directory"
fi
if [ -s $file ]
then
echo "File size is zero"
else
echo "File size is not zero"
fi
if [ -e $file ]
then
echo "File exists"
else
echo "File does not exist"
fi

#--------------------------------------------
# 这是一个自动打ipa的脚本，基于webfrogs的ipa-build书写：
# https://github.com/webfrogs/xcode_shell/blob/master/ipa-build
# 功能：自动为etao ios app打包，产出物为14个渠道的ipa包
# 特色：全自动打包，不需要输入任何参数
#--------------------------------------------
##### 用户配置区 开始 #####
#
#
# 项目根目录，推荐将此脚本放在项目的根目录，这里就不用改了
# 应用名，确保和Xcode里Product下的target_name.app名字一致
#
##### 用户配置区 结束 #####

str=‘this is a string‘

your_name=‘qinjx‘
str="Hello, I know your are \"$your_name\"! \n"

your_name="qinjx"
greeting="hello, "$your_name" !"
greeting_1="hello, ${your_name} !"
echo $greeting $greeting_1

string="alibaba is a great company"
echo ${string:1:4} #输出liba

string="alibaba is a great company"
echo `expr index "$string" is`

array_name=(
value0
value1
value2
value3
)

array_name[0]=value0
array_name[1]=value1
array_name[2]=value2

valuen=${array_name[2]}

#!/bin/sh
NAME[0]="Zara"
NAME[1]="Qadir"
NAME[2]="Mahnaz"
NAME[3]="Ayan"
NAME[4]="Daisy"
echo "First Index: ${NAME[0]}"
echo "Second Index: ${NAME[1]}"

${array_name[*]}
${array_name[@]}

#!/bin/sh
NAME[0]="Zara"
NAME[1]="Qadir"
NAME[2]="Mahnaz"
NAME[3]="Ayan"
NAME[4]="Daisy"
echo "First Method: ${NAME[*]}"
echo "Second Method: ${NAME[@]}"

# 取得数组元素的个数
length=${#array_name[@]}
# 或者
length=${#array_name[*]}
# 取得数组单个元素的长度
lengthn=${#array_name[n]}

echo arg

name="OK"
echo "$name It is a test"

mouth=8
echo "${mouth}-1-2009"

echo "OK!\n"
echo "It is a test"

echo "OK!\c"
echo "It is a test"

echo `date`

$printf "Hello, Shell\n"
Hello, Shell
$

# format-string为双引号
$ printf "%d %s\n" 1 "abc"
1 abc
# 单引号与双引号效果一样
$ printf ‘%d %s\n‘ 1 "abc"
1 abc
# 没有引号也可以输出
$ printf %s abcdef
abcdef
# 格式只指定了一个参数，但多出的参数仍然会按照该格式输出，format-string 被重用
$ printf %s abc def
abcdef
$ printf "%s\n" abc def
abc
def
$ printf "%s %s %s\n" a b c d e f g h i j
a b c
d e f
g h i
j
# 如果没有 arguments，那么 %s 用NULL代替，%d 用 0 代替
$ printf "%s and %d \n"
and 0
# 如果以 %d 的格式来显示字符串，那么会有警告，提示无效的数字，此时默认置为 0
$ printf "The first program always prints‘%s,%d\n‘" Hello Shell
-bash: printf: Shell: invalid number
The first program always prints ‘Hello,0‘
$

#!/bin/sh
a=10
b=20
if [ $a == $b ]
then
echo "a is equal to b"
fi
if [ $a != $b ]
then
echo "a is not equal to b"
fi

#!/bin/sh
a=10
b=20
if [ $a == $b ]
then
echo "a is equal to b"
else
echo "a is not equal to b"
fi

#!/bin/sh
a=10
b=20
if [ $a == $b ]
then
echo "a is equal to b"
elif [ $a -gt $b ]
then
echo "a is greater than b"
elif [ $a -lt $b ]
then
echo "a is less than b"
else
echo "None of the condition met"
fi

if test $[2*3] -eq $[1+5]; then echo ‘The two numbers are equal!‘; fi;

num1=$[2*3]
num2=$[1+5]
if test $[num1] -eq $[num2]
then
echo ‘The two numbers are equal!‘
else
echo ‘The two numbers are not equal!‘
fi

echo ‘Input a number between 1 to 4‘
echo ‘Your number is:\c‘
read aNum
case $aNum in
1) echo ‘You select 1‘
;;
2) echo ‘You select 2‘
;;
3) echo ‘You select 3‘
;;
4) echo ‘You select 4‘
;;
*) echo ‘You do not select a number between 1 to 4‘
;;
esac

#!/bin/bash
option="${1}"
case ${option} in
-f) FILE="${2}"
echo "File name is $FILE"
;;
-d) DIR="${2}"
echo "Dir name is $DIR"
;;
*)
echo "`basename ${0}`:usage: [-f file] | [-d directory]"
exit 1 # Command to come out of the program with status 1
;;
esac

for loop in 1 2 3 4 5
do
echo "The value is: $loop"
done

for str in ‘This is a string‘
do
echo $str
done

#!/bin/bash
for FILE in $HOME/.bash*
do
echo $FILE
done

COUNTER=0
while [ $COUNTER -lt 5 ]
do
COUNTER=‘expr $COUNTER+1‘
echo $COUNTER
done

echo ‘type <CTRL-D> to terminate‘
echo -n ‘enter your most liked film: ‘
while read FILM
do
echo "Yeah! great film the $FILM"
done

#!/bin/bash
while :
do
echo -n "Input a number between 1 to 5: "
read aNum
case $aNum in
1|2|3|4|5) echo "Your number is $aNum!"
;;
*) echo "You do not select a number between 1 to 5, game is over!"
break
;;
esac
done

break n

#!/bin/bash
for var1 in 1 2 3
do
for var2 in 0 5
do
if [ $var1 -eq 2 -a $var2 -eq 0 ]
then
break 2
else
echo "$var1 $var2"
fi
done
done

#!/bin/bash
while :
do
echo -n "Input a number between 1 to 5: "
read aNum
case $aNum in
1|2|3|4|5) echo "Your number is $aNum!"
;;
*) echo "You do not select a number between 1 to 5!"
continue
echo "Game is over!"
;;
esac
done

echo "Game is over!"

#!/bin/bash
NUMS="1 2 3 4 5 6 7"
for NUM in $NUMS
do
Q=`expr $NUM % 2`
if [ $Q -eq 0 ]
then
echo "Number is an even number!!"
continue
fi
echo "Found odd number"
done

#!/bin/bash
# Define your function here
Hello () {
echo "Url is http://see.xidian.edu.cn/cpp/shell/"
}
# Invoke your function
Hello

#!/bin/bash
funWithReturn(){
echo "The function is to get the sum of two numbers..."
echo -n "Input first number: "
read aNum
echo -n "Input another number: "
read anotherNum
echo "The two numbers are $aNum and $anotherNum !"
return $(($aNum+$anotherNum))
}
funWithReturn
# Capture value returnd by last command
ret=$?
echo "The sum of two numbers is $ret !"

#!/bin/bash
# Calling one function from another
number_one () {
echo "Url_1 is http://see.xidian.edu.cn/cpp/shell/"
number_two
}
number_two () {
echo "Url_2 is http://see.xidian.edu.cn/cpp/u/xitong/"
}
number_one

$unset .f function_name

#!/bin/bash
funWithParam(){
echo "The value of the first parameter is $1 !"
echo "The value of the second parameter is $2 !"
echo "The value of the tenth parameter is $10 !"
echo "The value of the tenth parameter is ${10} !"
echo "The value of the eleventh parameter is ${11} !"
echo "The amount of the parameters is $# !" # 参数个数
echo "The string of the parameters is $* !" # 传递给函数的所有参数
}
funWithParam 1 2 3 4 5 6 7 8 9 34 73

$ command > file

$ who > users

command < file

$command 2 > file

$command 2 >> file

$command > file 2>&1

$command >> file 2>&1

$command < file1 >file2

#!/bin/bash
cat << EOF
This is a simple lookup program
for good (and bad) restaurants
in Cape Town.
EOF

#!/bin/sh
filename=test.txt
vi $filename <<EndOfCommands
i
This file was created automatically from
a shell script
^[
ZZ
EndOfCommands

$ command > /dev/null

. filename

source filename

url="http://see.xidian.edu.cn/cpp/view/2738.html"

#!/bin/bash
. ./subscript.sh
echo $url