shell学习

一、数组

1、数组遍历

#!/bin/bash
SUPPORTED_OPENSTACK_VERSION=('libtery' 'mitaka' 'ocata')
for var in ${SUPPORTED_OPENSTACK_VERSION[@]}
do
    echo $var
done

运行结果

root@vSOM:~# ./test.sh 
libtery
mitaka
ocata

2、判断元素是否在数组中

#!/bin/bash
OPENSTACK_VERSION=('libtery' 'mitaka' 'ocata')
echo "please input openstack version:"
read version
if [[ "${OPENSTACK_VERSION[@]}" =~ ${version} ]]; then
    echo "$version in vesion array"
else
   echo "$version not in version array"
fi

运行结果

root@vSOM:~# ./test.sh 
please input openstack version:
mitaka
mitaka in vesion array
root@vSOM:~# ./test.sh 
please input openstack version:
juno
juno not in version array

3、数组实现菜单选择

#!/bin/bash 
SUPPORTED_OPENSTACK_VERSION=('libtery' 'mitaka' 'ocata')
echo "Please choose openstack version:"
select var in ${SUPPORTED_OPENSTACK_VERSION[@]};do
    echo "selected version:$var"
    break
done

运行结果

root@vSOM:~# ./test.sh 
Please choose openstack version:
1) libtery
2) mitaka
3) ocata
#? 2
selected version:mitaka

4、字符转换成数组

#!/bin/bash 
SUPPORTED_OPENSTACK_VERSION_STR='libtery mitaka ocata'
SUPPORTED_OPENSTACK_VERSION_ARRAY=($SUPPORTED_OPENSTACK_VERSION_STR)
for var in ${SUPPORTED_OPENSTACK_VERSION_ARRAY[@]}
do
   echo $var
done

运行结果

root@vSOM:~# ./test.sh 
libtery
mitaka
ocata

如果字符串的分隔符不是空格，可以将IFS设置成相应的分隔符，再转成数组，如下所示：

#!/bin/bash 
SUPPORTED_OPENSTACK_VERSION_STR='libtery;mitaka;ocata'
IFS=";"
SUPPORTED_OPENSTACK_VERSION_ARRAY=($SUPPORTED_OPENSTACK_VERSION_STR)
for var in ${SUPPORTED_OPENSTACK_VERSION_ARRAY[@]}
do
   echo $var
done

运行结果同上

二、字典

1、字典的定义和使用

declare -A NEUTRON_AGENT_SUPPORTED_VERSION
NEUTRON_AGENT_SUPPORTED_VERSION=([libtery]='7.2.0' [mitaka]='8.3.0' [ocata]='10.0.1')
echo "${NEUTRON_VERSION[mitaka]}"

运行结果

root@vSOM:~# ./test.sh 
8.3.0

三、字符串

1、分割字符串

#!/bin/bash
OPENSTACK_VERSION_STR='libtery;mitaka;ocata'
echo $OPENSTACK_VERSION_STR | cut -d ';' -f1 
echo $OPENSTACK_VERSION_STR | cut -d ';' -f3

运行结果

root@vSOM:~# ./test.sh 
libtery
ocata

也可以用下面的方法

#!/bin/bash
OPENSTACK_VERSION_STR='libtery;mitaka;ocata'
echo $OPENSTACK_VERSION_STR | awk -F ';' '{print $1}'
echo $OPENSTACK_VERSION_STR | awk -F ';' '{print $3}'

运行结果同上

（编辑：李大同）

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