Shell脚本编写与应用

脚本一：检查对象是否存在

判断目录是否存在，如果有就再判断是否有指定文件，不存在就创建这个文件，并把当前系统时间写入。

#!/bin/bash

if [ -e $HOME ]

then

echo "ok. $HOME exist."

if [ -e $HOME/testing ]

then

echo "Appending date to existing file"

date >> $HOME/testing

else

echo "Creating new file"

date >> $HOME/tesing

fi

else

echo "Sorry.you do not have a HOME directory"

fi

[root@www ~]# sh t2.sh

ok. /root exist.

Creating new file

脚本二：判断是否是文件

判断指定目录文件是否存在，如果存在，继续判断是否是一个文件

#!/bin/bash

#check if a file

if [ -e $HOME ];then

echo "The object exist. is it a file?"

if [ -f $HOME ];then

echo "Yes. it is a file."

else

echo "No. it is not a file!"

if [ -f $HOME/.bash_history ];then

echo "But this is a file!"

fi

else

echo "Sorry.the object does bot exist."

fi

[root@www ~]# sh t3.sh

The object exist. is it a file?

No. it is not a file!

But this is a file!

脚本三：检查文件是否可读

#!/bin/bash

#check if you can read a file

pwfile=/etc/shadow

if [ -f $pwfile ];then

if [ -r $file ];then

tail -n1 $pwfile

else

echo "Sorry. I am unable to read the $pwfile file"

fi

else

echo "Sorry. the file $file does not exist"

fi

1 2	`[root@www ~]# sh t4.sh` `admin:$6$sSKhOTAb$OaDGmJufvzbsZj4zFkdVFtvVYrVECdaGRvOB7Zrt9RSgmuiNxhlAIV5mtEkFSuX9gRxZ5LwxkXo06Ro0SN2Tm.:16818:0:99999:7:::`

脚本四：检查空文件-s

#!/bin/bash

#testing if a file is empty

file=file55

touch $file

if [ -s $file ];then

echo "The $file file exist and has data in it"

else

echo "The $file exist and is empty."

fi

date > $file

if [ -s $file ];then

echo "The $file file has data in it"

else

echo "The $file is still empty."

fi

[root@www ~]# sh t5.sh

The file55 exist and is empty.

The file55 file has data in it

[root@www ~]# sh t5.sh

The file55 file exist and has data in it

The file55 file has data in it

脚本五：检查是否可写

#!/bin/bash

#checking if a file is writeable

logfile=$HOME/t6file

touch $logfile

chmod u-w $logfile

now=`date +%Y-%m-%d-%H:%M`

if [ -w $logfile ];then

echo "The program ran at:$now" > $logfile

echo "The first attempt succeeded"

else

echo "The first attempt failed"

fi

chmod u+w $logfile

if [ -w $logfile ];then

echo "The program ran at:$now" > $logfile

echo "The second attempt succeeded"

else

echo "The second attempt failed"

fi

[root@www ~]# sh t6.sh

The first attempt succeeded

The second attempt succeeded

脚本六：检查是否可执行

#!/bin/bash

#checking file execution

if [ -x tesing ];then

echo "You can run the script:"

./tesing

else

echo "Sorry. you are unable to execute the script"

fi

[root@www ~]# sh t7.sh

Sorry. you are unable to execute the script

[root@www ~]# chmod a+x tesing

[root@www ~]# sh t7.sh

You can run the script:

脚本七：查看系统当前存在的普通用户数

#!/bin/bash

sum=`awk -F':' '$3 >= 500' /etc/passwd | wc -l`

uname=`awk -F: '$3 >= 500 {print $1," Uid=",$3}' /etc/passwd`

if [ $sum -eq 0 ];then

echo "The system exist $sum common users."

else

echo "The system exist $sum common users:"

echo "$uname"

fi

[root@master1 ~]# sh user1.sh

The system exist 2 users:

HM Uid= 500

UU Uid= 501

脚本八：按照日期格式（xxxx-xx-xx）每日生成一个文件，例如今天生成的文件为2013-09-23.log，并且把磁盘的使用情况写到到这个文件中。

#!/bin/bash

d=`date "+%F"`

dir=/home/disk_usage

f=/home/disk_usage/$d.log

[ -d $dir ] || mkdir /home/disk_usage

if [ $? -eq 0 ];then

echo "-------------------------------------" >> $f

df -Th >> $f

fi

脚本九：用脚本生成shell脚本文件头

1、方法一

#!/bin/bash

if ! sed -n '/^#!/p' $1 &>/dev/null

then

cat >> $1 << EOF

#!/bin/bash

#author by HM

#Date & Time:`date +"%F %T"`

EOF

fi

vim +3 $1

2、方法二

#!/bin/bash

file=$1

dt=`date +"%F %T"`

touch $file

echo "#!/bin/bash" >> $file

echo "#author by HM" >> $file

echo "#Date & Time: $dt" >> $file

vim +3 $file

脚本十：判断当前的操作系统的类型，使用if elif语句

#!/bin/bash

PLATFORM=`uname -s`

FREEBSD=

SUNOS=

MAC=

AIX=

MINIX=

LINUX=

echo

echo "Identifying the platfrom on which this installer is running on .."

echo

if [ "$PLATFORM" = "FreeBSD" ];then

echo "This is FreeBSD system."

FREEBSD=1

elif [ "$PLATFORM" = "SunOS" ];then

echo "This is Solaris system."

SUNOS=1

elif [ "PLATFORM" = "Darwin" ];then

echo "This is Mac OSX system."

MAC=1

elif [ "$PLATFORM" = "AIX" ];then

echo "This is AIX system."

AIX=1

elif [ "$PLATFORM" = "MINIX" ];then

echo "This is MINIX system."

MINIX=1

elif [ "$PLATFORM" = "Linux" ];then

echo "This is Linux system."

LINUX=1

else

echo "Failed to identify this Openrating System,Abort!"

exit 1

fi

echo "Starting to install the software..."

echo

exit 0

执行结果

[root@salve1 ~]# sh sys.sh

Identifying the platfrom on which this installer is running on ..

This is Linux system.

Starting to install the software...

脚本十一：打印九九乘法口诀

#!/bin/bash

for i in {1..9}

do

for j in `seq 1 $i`

do

m=`echo "$i" "*" "$j" | bc`

echo -n "$j "x" $i "=" $m" " "

done

echo " "

done

# sh 9x9.sh

1 x 1 = 1

1 x 2 = 2 2 x 2 = 4

1 x 3 = 3 2 x 3 = 6 3 x 3 = 9

1 x 4 = 4 2 x 4 = 8 3 x 4 = 12 4 x 4 = 16

1 x 5 = 5 2 x 5 = 10 3 x 5 = 15 4 x 5 = 20 5 x 5 = 25

1 x 6 = 6 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24 5 x 6 = 30 6 x 6 = 36

1 x 7 = 7  2 x 7 = 14  3 x 7 = 21  4 x 7 = 28  5 x 7 = 35  6 x 7 = 42  7 x 7 = 49

1 x 8 = 8  2 x 8 = 16  3 x 8 = 24  4 x 8 = 32  5 x 8 = 40  6 x 8 = 48  7 x 8 = 56  8 x 8 = 64

1 x 9 = 9  2 x 9 = 18  3 x 9 = 27  4 x 9 = 36  5 x 9 = 45  6 x 9 = 54  7 x 9 = 63  8 x 9 = 72  9 x 9 = 81

脚本十二：case的使用方法

#!/bin/bash

#clear清除屏幕

clear

echo " File Operation List"

echo " ---- --------- ----"

echo "Choose one of the following operations:"

echo

echo "[O]pen File"

echo "[D]elete File"

echo "[R]ename File"

echo "[M]ove File"

echo "[C]opy File"

echo "[P]aste File"

echo

echo -n "Please enter your operation:"

read operation

case "$operation" in

"O"|"o")

echo

echo "Opening File ..."

echo "Successed!"

;;

"D"|"d")

echo

echo "Deleleting File..."

echo "Successed!"

;;

"R"|"r")

echo

echo "Rename File to File2"

echo "Successed!"

;;

"M"|"m")

echo

echo "Moving File1 to File2..."

echo "Successed!"

;;

"C"|"c")

echo

echo "Copying File1 to File2..."

echo "Successed!"

;;

"P"|"p")

echo

echo "Paste File"

echo "Successed!"

;;

*)

echo

echo "Error,Unknown operation."

echo "Program exit!"

exit 1

;;

esac

echo

exit 0

# sh case1.sh

File Operation List

---- --------- ----

Choose one of the following operations:

[O]pen File

[D]elete File

[R]ename File

[M]ove File

[C]opy File

[P]aste File

Please enter your operation:o

Opening File ...

Successed!

本文转自 HMLinux 51CTO博客，原文链接:http://blog.51cto.com/7424593/1736333

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