bash 脚本中的嵌套案例
我在 bash 脚本中编写了以下函数，但它不起作用。 我错过了一些明显的东西吗？
main_menu() {
dialog \
--title "Sim Gateway Infomation Utility" \
--menu "What do you want to do?" 12 60 5 \
Summary "View overall summary" \
Details "View details of a sim bank" \
Modify "Modify used minutes of a sim" \
Exit "Exit" \
2>$tempfile
retval=$?
case retval in
0)
choice=`cat $tempfile`
case $choice in
Summary) summary;;
Details) details;;
Modify) modify;;
Exit) clean_up;;
esac
;;
1)
confirm_exit;;
255)
confirm_exit;;
esac
}
I have written the following function in a bash script but it is not working.
Am I missing something obvious?
main_menu() {
dialog \
--title "Sim Gateway Infomation Utility" \
--menu "What do you want to do?" 12 60 5 \
Summary "View overall summary" \
Details "View details of a sim bank" \
Modify "Modify used minutes of a sim" \
Exit "Exit" \
2>$tempfile
retval=$?
case retval in
0)
choice=`cat $tempfile`
case $choice in
Summary) summary;;
Details) details;;
Modify) modify;;
Exit) clean_up;;
esac
;;
1)
confirm_exit;;
255)
confirm_exit;;
esac
}
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这篇文章讨论了
dialog；我对此没有经验。您的“
case retval in”需要为“case $retval in”（或“case "$retval" in”）。[@Idelic 指出我原来的答案比必要的更加保守。]
字符串“retval”与您在外壳语句中列出的选项都不匹配（使用“*”选项来检测意外的情况） ）。如果
$retval包含空格，双引号可以防止发生意外；一般来说，在语句中的 case "$var" 中（以及大多数其他地方也是如此），最好在变量周围使用双引号。在这种特殊情况下，这并不重要；退出状态始终是一个数字。在 'case "$choice" in' 语句中，我对变量周围的引号感到更舒服 - 但你可能仍然是安全的（我需要阅读有关的更多信息对话框以确定它的作用以及它是否生成空格 - 或者甚至什么都不生成）。This article discusses
dialog; I'm not experienced with it.Your '
case retval in' needs to be 'case $retval in(or 'case "$retval" in).[@Idelic notes that my original answer was more conservative than necesssary.]
The string 'retval' matches none of the options you list in your outer case statement (use a '*' option to detect the unexpected). The double quotes prevent accidents if
$retvalever contained spaces; in general, it is a good idea to use double quotes around the variable incase "$var" instatements (and most other places too). In this particular case, it would not matter; the exit status is always a number. In the 'case "$choice" in' statement, I'd be more comfortable with the quotes around the variable - but you may still be safe (I'd need to read more aboutdialogto be sure of what it does and whether it ever generates spaces - or nothing even).