我试图写一个shell script来读取用户输入数据，并检查输入值是大写，小写还是其他。但是我写的只是检查单个字符
这是我写的：
printf 'Please enter a character: '
IFS= read -r c
case $c in
([[:lower:]]) echo lowercase letter;;
([[:upper:]]) echo uppercase letter;;
([[:alpha:]]) echo neither lower nor uppercase letter;;
([[:digit:]]) echo decimal digit;;
(?) echo any other single character;;
("") echo nothing;;
(*) echo anything else;;
esac
如何使它读取除单个字符以外的长字符串，并相应地获取输出？
您可以通过多种方式进行操作，这里有一个：
#!/bin/bash
read -p "Enter something: " str
echo "Your input is: $str"
strUppercase=$(printf '%s\n' "$str" | awk '{ print toupper($0) }')
strLowercase=$(printf '%s\n' "$str" | awk '{ print tolower($0) }')
if [ -z "${str//[0-9]}" ]
then
echo "Digit"
elif [ $str == $strLowercase ]
then
echo "Lowercase"
elif [ $str == $strUppercase ]
then
echo "Uppercase"
else
echo "Something else"
fi
在使用shopt -s extglob之前，可以使用+([[:upper:]])来匹配由一个或多个大写字母组成的字符串。
来自man 1 bash：
If the extglob shell option is enabled using the shopt builtin,several
extended pattern matching operators are recognized. In the following
description,a pattern-list is a list of one or more patterns separated
by a |. Composite patterns may be formed using one or more of the fol‐
lowing sub-patterns:
?(pattern-list)
Matches zero or one occurrence of the given patterns
*(pattern-list)
Matches zero or more occurrences of the given patterns
+(pattern-list)
Matches one or more occurrences of the given patterns
@(pattern-list)
Matches one of the given patterns
!(pattern-list)
Matches anything except one of the given patterns
例如，使用+([[:upper:][:digit:] .])来匹配一个或多个{大写字母，数字，空格，点}。考虑使用POSIX标准中定义的其他一些以下类：alnum alpha ascii blank cntrl digit graph lower print punct space upper word xdigit
证明有效（只是对示例的测试）：
shopt -s extglob; case "1A5. .Q7." in (+([[:upper:][:digit:] .])) echo "it works";; esac