linux sheel script demo
demo1 (输入/输出)
1.1. target :
输入姓、名, 输出姓名
1.2. create directory
mkdir ~/bin
1.3. create & edit sheel script
vim fullname.sh
note: more comment is useful
#!/bin/bash
#Program
# User inputs his first name and last name . Program shows his full name.
#History :
#// logan First lease
PATH=/bin:$PATH #将当前目录加入系统环境
export PATH
read -p "Please input your firstname:" firstname
read -p "Please input your lastname:" lastname
echo -e "\nYour full name is :" ${firstname} ${lastname}
1.4. run
[rocky@localhost bin]$ sh fullname.sh
demo2 (计算PI)
2.1 target
输入小数点后位数 输出PI
2.2 create & edit
vim cal_pi.sh
#!/bin/bash
#Program:
# Usre input a scale number to calculate pi number.
#History:
#// logan First lease
PATH=/bin:PATH
export PATH
echo -e "This program will calculate pi value. \n"
echo -e "You should input a float number to calculate pi value. \n"
read -p "This scale number (10-10000) ? " checking
num=${checking:-""}
echo -e "Starting calculate pi value. Be patient."
time echo "scale=${num}; 4*a(1)"|bc -lq
2.3 run
输入 5
输出 3.14156
demo3 ($# $@ $* 的使用)
3.1 target
输入参数, 显示相关结果
3.2 create & edit sheel
vim how_paras.sh
#!/bin/bash
#Program:
# Program shows the script name, parameters
#History:
#// logan First release
PATH=/bin:$PATH
export PATH echo "The script name is ==> ${0}"
echo "Total parameter number is ==> $#"
[ "$#" -lt ] && echo "The number of parameter is less than 2. Stop here." && eexit
echo "Your whole parameter is ==> '$@'"
echo "The 1st parameter ==> ${1}"
echo "The 2nd parameter ==> ${2}"
3.3 run
[logan@localhost bin]$ sh how_paras.sh zhang li wang
The script name is ==> how_paras.sh
Total parameter number is ==> 3
Your whole parameter is ==> 'zhang li wang'
The 1st parameter ==> zhang
The 2nd parameter ==> li
demo4 (shift 使用)
4.1 vim how_shift.sh
.....#省略注释 PATH......
echo "The script name is ==> ${0}"
echo "Total parameter number is ==> $#"
[ "$#" -lt ] && echo "The number of parameter is less than 6. Stop here." && eexit
echo "Your whole parameter is ==> '$@'"
shift
echo "------------------shift one--------"
echo "Total parameter number is ==>$#"
echo "The whole parameter is $@"
shift
echo "------------------shift three------"
echo "Total parameter number is ==>$#"
echo "the whole parameter is ==> $@"
4.2 run
[logan@localhost bin]$ sh how_shift.sh one two three four five six
The script name is ==> how_paras.sh
Total parameter number is ==> 6
Your whole parameter is ==> 'one two three four five six'
------------------shift one--------
Total parameter number is ==>5
The whole parameter is two three four five six
------------------shift three------
Total parameter number is ==>2
the whole parameter is ==> five six
[logan@localhost bin]$ vim how_paras.sh
demo5 (if 条件判断式)
5.1 vim if_fi.sh
#!/bin/bash
#Program:
# This program shows the user's choice
#History:
# logan first release
PATH=/bin:$PATH
export PATH read -p "Please input (Y/N): " yn if [ "${yn}" == "Y" ] || [ "${yn}" == "y" ];then
echo "OK, continue"
exit
fi if [ "${yn}" == "N" ] || [ "${yn}" == "n" ];then
echo "Oh, interrupt!"
exit
fi echo "I don't know what your choice is" && exit
note: 中括号内 变量及字符两边需要空格符,否则报错 '找不到命令'
5.2 run
sh if_fi.sh
demo6 (日期计算)
6.1 vim cal_retired.sh
#!/bin/bash
#Program:
# You input your demobilization date, I calculate how many days before you demobilize.
#History:
#// logan first release
PATH=/bin:$PATH
export PATH #. tell user the function of the shell script, and the format of the date
echo "This program will try to calculate:"
echo "How many days before your demobilization date..."
read -p "Please input your demobilization date (YYYYMMDD ex>20131230): " date2 #. test the comment you just input with the Pattern
date_d=$(echo ${date2} |grep '[0-9]\{8\}') # check length whether of the input num
if [ "${date_d}" == "" ];then
echo "You input the wrong date format...."
exit
fi #. begin to calculate the date
declare -i date_dem=$(date --date="${date2}" +%s) #seconds count of the input date
declare -i date_now=$(date +%s) #seconds count date now
declare -i date_total_s=$((${date_dem}-${date_now})) #differ from the two date
declare -i date_d=$((${date_total_s}///)) #transfer to days
if [ "${date_total_s}" -lt "" ];then
echo "You had been demobization before: " $((-*${date_d})) " days ago"
else
declare -i date_h=$(($((${date_total_s}-${date_d}***))//))
echo "You will demobilize after ${date_d} days and ${date_h} hours."
fi
6.2 run
sh cal_retired.sh
demo7 (case..esac)
7.1 vim hello-3.sh
#!/bin/bash
#Program:
# Show "Hello" from $.... by using case .... esac
#History:
#// logan First lease
PATH=/bin:$PATH
export PATH case ${} in
"hello")
echo "Hello, how are you?"
;;
"")
echo "You MUST input parameters, ex> {${0} someword}"
;;
*)
echo "Usage ${0} {hello}"
;; esac
7.2 run
sh hello-3.sh
demo8 (function使用)
vim demo.sh
#!/bin/bash
#Program:
# Show "one two three" from $.... by using case .... esac
#History:
#// logan First lease
PATH=/bin:$PATH
export PATH function printit(){
echo -n "Your choice is " #-n means not enter to next line
} case ${} in
"one")
printit; echo ${} | tr 'a-z' 'A-Z' #transfer to Upper
;;
"two")
printit; echo ${} | tr 'a-z' 'A-Z' #transfer to Upper
;;
"three")
printit; echo ${} | tr 'a-z' 'A-Z' #transfer to Upper
;;
*)
echo "Usage ${0} {one|two|three}"
;; esac
8.2 run
sh demo.sh one
demo9
9.1 vim while_do_done.sh
#!/bin/bash
#Program:
# Repeat question until user input correct answer.
#History:
#// logan first release
PATH=/bin:$PATH
export PATH while [ "${yn}" != "yes" -a "${yn}" != "YES" ]
do
read -p "Please input yes/YES to stop this program: " yn
done
echo "OK! you input the correct answer."
9.2 run
sh while_do_done.sh
demo10
10.1 vim add_1_to_100.sh
#!/bin/bash
#Program:
# calculate the sum of num ,...
#History:
#// logan first release
PATH=/bin:$PATH
export PATH s=
i=
while [ "${i}" != "" ]
do
i=$(($i+))
s=$(($s+i))
done
echo "The result of '1+2+3...+100' is ==> $s"
10.2 run
sh add_1_to_100.sh
10.3 vim add_1_to_num.sh
#!/bin/bash
#Program:
# calculate the sum of num ,...
#History:
#// logan first release
PATH=/bin:$PATH
export PATH s=
i=
j=
while [ "${j}" -le "" ]
do
read -p "Please input the num: " j
done
while [ "${i}" != "${j}" ]
do
i=$(($i+))
s=$(($s+i))
done
echo "The result of '1+...+ ${j}' is ==> $s"
demo11
11.1 vim for_test.sh
#!/bin/bash
PATH=/bin:$PATH
export PATH for animal in dog cat elephant
do
echo "There are ${animal}s..."
done
11.2 sh for_test.sh
demo12
12.1 target
ping 局域网内 192.168.1.1~100的看通不通, seq(sequence)指令的使用
12.2 vim pingip.sh
#!/bin/bash
#Program
# Use ping command to check the network's PC state
#History
#2017/04/14 logan first release
PATH=/bin:$PATH
export PATH network="192.168.1"
for sitenu in $(seq 1 100) #seq 为 sequence(连续)的缩写
do
ping -c 1 -w 1 ${network}.${sitenu} &> /dev/null && result=0 || result=1
if [ "${result}" == 0 ];then
echo "Server ${network}.${sitenu} is UP."
else
echo "Server ${network}.${sitenu} is DOWN."
fi
done
12.3 run
sh pingip.sh
demo13
13.1 target
判断式(test)的使用
13.2 vim dir_perm.sh
#!/bin/bash
#Program
# User input dir name, I find the permission of files.
#History:
#2017/04/14 logan first release
PATH=/bin:$PATH
export PATH read -p "Please input a directory: " dir
if [ "${dir}" == "" -o ! -d "${dir}" ]; then
echo "The ${dir} is NOT exist in your system."
exit 1
fi filelist=$(ls ${dir})
for filename in ${filelist}
do
perm=""
test -r "${dir}/${filename}" && perm="${perm} readable"
test -w "${dir}/${filename}" && perm="${perm} writable"
test -x "${dir}/${filename}" && perm="${perm} executable"
echo "The file ${dir}/${filename}'s permission is ${perm} "
done
13.3 run
sh dir_perm.sh
demo14
14.1 description
for循环的使用
14.2 vim cal_1_nu.sh
#!/bin/bash
#Program
# Try do calculate 1+2+..+ ${your_input}
#History:
#2017/04/14 logan first release
PATH=/bin:$PATH
export PATH read -p "Please input a number, I will count for 1+2..+ your_input:" nu s=0
for (( i=1; i<=${nu}; i=i+1))
do
s=$((${s}+${i}))
done
echo "The result of '1+2+...${nu}' is ==> ${s}"
demo15
15.1 target
随机选择3种菜
15.2 vim what_to_eat3.sh
#!/bin/bash
#Program
# Try do tell you what you may eat.
PATH=/bin:$PATH
export PATH eat[]="zhang san ji"
eat[]="li si ji"
eat[]='wang wu ji'
eat[]="zhang liu ji"
eat[]="qian qi ji"
eat[]="hao 1"
eat[]="hao 2"
eat[]="hao 3"
eat[]="hao 4"
num= count=
while [ "${count}" -lt ]; do
check=$(( ${RANDOM} * ${num} / + ))
flag=
if [ "${count}" -ge ];then
for i in $(seq ${count} )
do
if [ "${selectedNum[$i]}" == $check ];then
flag=
fi
done
fi
if [ ${flag} == ];then
echo "You mat eat ${eat[${check}]}"
count=$((${count} + ))
selectedNum[${count}]=${check} fi
done
demo16 (计算生日)
16.1 vim birthday_howlong.sh
#!/bin/bash
#Program
# how many days your birthday remain
#History
#// logan first release
read -p "Please input your birthday (MMDD, ex>0709): " bir
now=`date +%m%d`
if [ "$bir" == "$now" ];then
echo "Happy birthday to you!!!"
elif [ "$bir" -gt "$now" ];then
year=`date +%Y`
total_d=$(($((`date --date="$year$bir" +%s`-`date +%s`))///))
echo "Your birthday will be $total_d later"
else
year=$((`date +%Y`+))
total_d=$(($((`date --date="$year$bir" +%s`-`date +%s`))///))
echo "Your birthday will be $total_d later"
fi
demo17 (show accounts)
17.1 vim show_account.sh
#!/bin/bash
accounts=`cat /etc/passwd | cut -d':' -f1`
for account in $accounts
do
declare -i i=$i+
echo "The $i account is \"$account\" "
done
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