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。
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#!/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
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[root@www ~]
# sh t2.sh
ok.
/root
exist.
Creating new
file
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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
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#!/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
fi
else
echo
"Sorry.the object does bot exist."
fi
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[root@www ~]
# sh t3.sh
The object exist. is it a
file
?
No. it is not a
file
!
But this is a
file
!
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脚本三：检查文件是否可读
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#!/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
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2
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[root@www ~]
# sh t4.sh
admin:$6$sSKhOTAb$OaDGmJufvzbsZj4zFkdVFtvVYrVECdaGRvOB7Zrt9RSgmuiNxhlAIV5mtEkFSuX9gRxZ5LwxkXo06Ro0SN2Tm.:16818:0:99999:7:::
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脚本四：检查空文件-s
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#!/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 $file is still empty."
fi
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[root@www ~]
# sh t5.sh
The file55 exist and is empty.
The file55
file
has data
in
it
[root@www ~]
# sh t5.sh
The file55
file
exist and has data
in
it
The file55
file
has data
in
it
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脚本五：检查是否可写
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#!/bin/bash
#checking if a file is writeable
logfile=$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
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[root@www ~]
# sh t6.sh
The first attempt succeeded
The second attempt succeeded
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脚本六：检查是否可执行
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#!/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
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[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:
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脚本七：查看系统当前存在的普通用户数
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#!/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
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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。
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#!/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
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脚本九：用脚本生成shell脚本文件头
1、方法一
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#!/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
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2、方法二
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#!/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
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脚本十：判断当前的操作系统的类型，使用if elif语句
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#!/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
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执行结果
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[root@salve1 ~]
# sh sys.sh
Identifying the platfrom on
which
this installer is running on ..
This is Linux system.
Starting to
install
the software...
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脚本十一：打印九九乘法口诀
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#!/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 "
=
" $m"
" "
done
echo
" "
done
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# sh 9x9.sh
1 x 1 = 1
1 x 2 = 2 2 x 2 = 4
1 x 3 = 3 2 x 3 = 6 3 x 3 = 9
1 x 4 = 4 2 x 4 = 8 3 x 4 = 12 4 x 4 = 16
1 x 5 = 5 2 x 5 = 10 3 x 5 = 15 4 x 5 = 20 5 x 5 = 25
1 x 6 = 6 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24 5 x 6 = 30 6 x 6 = 36
1 x 7 = 7 2 x 7 = 14 3 x 7 = 21 4 x 7 = 28 5 x 7 = 35 6 x 7 = 42 7 x 7 = 49
1 x 8 = 8 2 x 8 = 16 3 x 8 = 24 4 x 8 = 32 5 x 8 = 40 6 x 8 = 48 7 x 8 = 56 8 x 8 = 64
1 x 9 = 9 2 x 9 = 18 3 x 9 = 27 4 x 9 = 36 5 x 9 = 45 6 x 9 = 54 7 x 9 = 63 8 x 9 = 72 9 x 9 = 81
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脚本十二：case的使用方法
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#!/bin/bash
#clear清除屏幕
clear
echo
" File Operation List"
echo
" ---- --------- ----"
echo
"Choose one of the following operations:"
echo
echo
"[O]pen File"
echo
"[D]elete File"
echo
"[R]ename File"
echo
"[M]ove File"
echo
"[C]opy File"
echo
"[P]aste File"
echo
echo
-n
"Please enter your operation:"
read
operation
case
"$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
|
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# 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!
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本文转自 HMLinux 51CTO博客，原文链接:http://blog.51cto.com/7424593/1736333
