几个Shell脚本的例子，觉得还不错。
【例子:001】判断输入为数字，字符或其他
#!/bin/bash read -p "Enter a number or string here:" input case $input in [0-9]) echo -e "Good job, Your input is a numberic! \n" ;; [a-zA-Z]) echo -e "Good job, Your input is a character! \n" ;; *) echo -e "Your input is wrong, input again! \n" ;; esac
#!/bin/bash
# Calculate the average of a series of numbers.
SCORE="0"
AVERAGE="0"
SUM="0"
NUM="0"
while true; do
echo -n "Enter your score [0-100%] ('q' for quit): "; read SCORE;
if (("$SCORE" < "0")) || (("$SCORE" > "100")); then
echo "Be serious. Common, try again: "
elif [ "$SCORE" == "q" ]; then
echo "Average rating: $AVERAGE%."
break
else
SUM=$[$SUM + $SCORE]
NUM=$[$NUM + 1]
AVERAGE=$[$SUM / $NUM]
fi
done
echo "Exiting."
[scriptname: doit.sh] while (( $# > 0 )) do echo $* shift done /> ./doit.sh a b c d e a b c d e b c d e c d e d e e
# 人名列表 # cat namelist Jame Bob Tom Jerry Sherry Alice John # 脚本程序 # cat namelist.sh #!/bin/bash for name in $(cat namelist) do echo "name= " $name done echo "The name is out of namelist file" # 输出结果 # ./namelist.sh name= Jame name= Bob name= Tom name= Jerry name= Sherry name= Alice name= John
【例子:005】批量测试文件是否存在
[root@host ~]# cat testfile.sh #!/bin/bash for file in test*.sh do if [ -f $file ];then echo "$file existed." fi done [root@host ~]# ./testfile.sh test.sh existed. test1.sh existed. test2.sh existed. test3.sh existed. test4.sh existed. test5.sh existed. test78.sh existed. test_dev_null.sh existed. testfile.sh existed.
[root@host ~]# df -ih /tmp
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/mapper/vg00-lvol5
1000K 3.8K 997K 1% /tmp
[root@host ~]# cat cover_disk.sh
#!/bin/env bash
counter=0
max=3800
remainder=0
while true
do
((counter=counter+1))
if [ ${#counter} -gt $max ];then
break
fi
((remainder=counter%1000))
if [ $remainder -eq 0 ];then
echo -e "counter=$counter\tdate=" $(date)
fi
mkdir -p /tmp/temp
cat < testfile > "/tmp/temp/myfile.$counter"
if [ $? -ne 0 ];then
echo "Failed to write file to Disk."
exit 1
fi
done
echo "Done!"
[root@host ~]# ./cover_disk.sh
counter=1000 date= Wed Sep 10 09:20:39 HKT 2014
counter=2000 date= Wed Sep 10 09:20:48 HKT 2014
counter=3000 date= Wed Sep 10 09:20:56 HKT 2014
cat: write error: No space left on device
Failed to write file to Disk.
dd if=/dev/zero of=testfile bs=1M count=1
[root@host ~]# cat hosts.allow
127.0.0.1
127.0.0.2
127.0.0.3
127.0.0.4
127.0.0.5
127.0.0.6
127.0.0.7
127.0.0.8
127.0.0.9
[root@host ~]# cat readlines.sh
#!/bin/env bash
i=0
while read LINE;do
hosts_allow[$i]=$LINE
((i++))
done < hosts.allow
for ((i=1;i<=${#hosts_allow[@]};i++)); do
echo ${hosts_allow[$i]}
done
echo "Done"
[root@host ~]# ./readlines.sh
127.0.0.2
127.0.0.3
127.0.0.4
127.0.0.5
127.0.0.6
127.0.0.7
127.0.0.8
127.0.0.9
Done
[root@host ~]# cat regex.sh
#!/bin/env sh
#Filename: regex.sh
regex="[A-Za-z0-9]{6}"
if [[ $1 =~ $regex ]]
then
num=$1
echo $num
else
echo "Invalid entry"
exit 1
fi
[root@host ~]# ./regex.sh 123abc
123abc
#!/bin/env bash
#Filename: validint.sh
validint(){
ret=`echo $1 | awk '{start = match($1,/^-?[0-9]+$/);if (start == 0) print "1";else print "0"}'`
return $ret
}
validint $1
if [ $? -ne 0 ]; then
echo "Wrong Entry"
exit 1
else
echo "OK! Input number is:" $1
fi
#!/bin/bash NOW=$(date +"%m-%d-%Y") # 当前日期 FILE="backup.$NOW.tar.gz" # 备份文件 echo "Backing up data to /tmp/backup.$NOW.tar.gz file, please wait..." #打印信息 tar xcvf /tmp/backup.$NOW.tar.gz /home/ /etc/ /var # 同时备份多个文件到指定的tar压缩文件中 echo "Done..."