我写了这个脚本:
#!/bin/bash
#Greetings
#This program displays greetings according to the time of the day
#
echo
hour='date +%H'
if[ "$hour" -le 12 ]
then
echo "GOOD MORNING"
elif[ "$hour" -le 18 ]
then
echo "GOOD AFTERNOON"
else
echo "GOOD EVENING"
fi
done
echo
then
它一直告诉我,他们的and语句是错误的fi
。
答案1
if
/关键字elif
后面需要一些空格(否则 shell 将无法理解它们与后面的单词是分开的):
if [ "$hour" -le 12 ]; then echo "hour is less than or equal to twelve"; fi