Python有一个方便的语言功能,称为“for-else”(类似地,“while-else”),如下所示：
for obj in my_list:
if obj == target:
break
else: # note: this else is attached to the for,not the if
print "nothing matched",target,"in the list"
基本上,如果循环中断,则else被跳过,但如果循环通过条件失败(for while)或迭代结束(for for)退出,则运行else.
有没有办法在bash中做到这一点？最近我想到的是使用一个标志变量：
flag=false
for i in x y z; do
if [ condition $i ]; then
flag=true
break
fi
done
if ! $flag; then
echo "nothing in the list fulfilled the condition"
fi
这是比较冗长的.
使用子shell：
原文链接：https://www.f2er.com/bash/383671.html( for i in x y z; do
[ condition $i ] && echo "Condition $i true!" || exit;
done ) && echo "All was well!" || echo "Something went wrong!"
