[英]How to add an unknown amount of numbers from user input in Linux shell script
我正在尝试将用户输入的所有数字相加,但是对于用户可以输入的数字数量没有限制。 我如何在 linux shell 脚本中对此进行编码?
到目前为止我有这个:
firstNumber=0
secondNumber=0
number=0
echo Please enter two numbers to add up
read firstNumber
read secondNumber
echo Would you like to keep adding numbers? YES OR NO
read answer
if answer = YES
then
echo Please add another number
read number
echo $(($firstNumber +$secondNumber + $number))
fi
while answer = NO
do
echo $(($firstNumber + $secondNumber))
done
正如@dash-o 推荐的那样,以 ENTER 结尾的简单输入序列是最简单的方法:
#!/usr/bin/env sh
sum=0
echo "Please enter integer numbers to add, or just RETURN to end."
while read -r number && [ -n "$number" ]; do
if [ "$number" -eq "$number" ] 2>/dev/null; then
sum=$((sum + number))
echo "Sum is: $sum"
else
echo "$number is not a valid integer. Try again..." >&2
fi
done
或者允许每行输入多个整数:
#!/usr/bin/env sh
# Save the shell's options state
shelloptions="$(set +o)"
# Disable globbing to prevent filename expansion in parameters
set -o noglob
sum=0
echo "Please enter integer numbers to add, or RETURN to end."
# Read lines until empty REPLY
while read -r && [ -n "$REPLY" ]; do
# Split $REPLY as parameters
# Globbing is turned-off so filenames will not mess with entries
# shellcheck disable=SC2086 # Explicitly intended word splitting
set -- $REPLY
# Iterate numbers from the parameters array
for number in "$@"; do
# If $number is a valid integer
if [ "$number" -eq "$number" ] 2>/dev/null; then
sum=$((sum + number))
else
echo "$number is not a valid integer." >&2
fi
done
echo "Sum is: $sum"
done
# Restore the shell's options state
eval "$shelloptions"
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