bash的选择菜单获得指数

Question

例如

#!/bin/bash 

INSTALL_PATH="/usr/local" 
BFGMINER_INSTALL_PATH="${INSTALL_PATH}/bfgminer" 
BFGMINER_REPO="https://github.com/luke-jr/bfgminer.git" 

list_last_ten_bfgminer_tags() { 
    cd ${BFGMINER_INSTALL_PATH} 
    git for-each-ref --format="%(refname)" --sort=-taggerdate --count=10 refs/tags | cut -c 6- 
} 

clone_bfgminer() { 
    cd ${INSTALL_PATH} 
    git clone ${BFGMINER_REPO} ${BFGMINER_INSTALL_PATH} 
} 

echo "select number to switch tag or n to continue" 
select result in master $(list_last_ten_bfgminer_tags) 
do 

    # HOW DO I CHECK THE INDEX??????? <================================= QUESTION 
    if [[ ${result} == [0-9] && ${result} < 11 && ${result} > 0 ]] 
     then 
      echo "switching to tag ${result}" 
      cd ${BFGMINER_INSTALL_PATH} 
      git checkout ${result} 
    else 
     echo "continue installing master" 
    fi 

    break 
done 

因此，如果用户输入1，case语句检查比赛上的文字，我怎么能匹配1呢？

Answer 1

你并不需要检查选择了哪个值;你可以简单地使用它。 做的唯一事情想检查的是master，这很容易做到。

select result in master $(list_last_ten_bfgminer_tags) 
do 
    if [[ $result = master ]]; then 
     echo "continue installing master" 
    elif [[ -z "$result" ]]; then 
     continue 
    else 
     echo "switching to tag ${result}" 
     cd ${BFGMINER_INSTALL_PATH} 
     git checkout ${result} 
    fi 
    break 
done 

Answer 2

我很努力地理解你的问题，但这里是一些示例代码;该阵列可以动态填充，我猜你是从哪里来的：

$ cat t.sh 
#!/bin/bash 

foo=(one two three four) 

echo "Please select an option: " 
select reply in "${foo[@]}"; do 
     [ -n "${reply}" ] && break 
done 
echo "You selected: ${reply}" 

。

$ ./t.sh 
Please select an option: 
1) one 
2) two 
3) three 
4) four 
#? 5 
#? 100 
#? 2 
You selected: two 

这是怎么回事？

当然，如果您希望输出/逻辑与select提供的输出/逻辑不同，您也可以使用read并自行构建功能。

Answer 3

使用$REPLY变量

PS3="Select what you want>" 
select answer in "aaa" "bbb" "ccc" "exit program" 
do 
case "$REPLY" in 
    1) echo "1" ; break;; 
    2) echo "2" ; break;; 
    3) echo "3" ; break;; 
    4) exit ;; 
esac 
done