[英]How to redirect output to STDERR?
Suppose that I passed in 2 parameters to my function.假设我将 2 个参数传递给我的函数。 How can I redirect a message to stderr?
如何将消息重定向到 stderr?
#!/bin/bash
if [ $# = 0 ]; then
dir="."
elif [ $# = 1 ]; then
dir=$1
elif [ $# -ge 2 ]; then
echo "Too many operands." 2>> err.txt //???
exit 1
fi
Just add >&2
to the statement producing the output:只需将
>&2
添加到生成输出的语句中:
echo "Too many operands." >&2
and if you want it to be appended to a file named err.txt
too:如果您也希望将其附加到名为
err.txt
的文件中:
echo "Too many operands." | tee -a 'err.txt' >&2
FWIW I'd write your code using a case statement instead of nested if
s (and tidy up a couple of things): FWIW 我会使用 case 语句而不是嵌套
if
s(并整理一些东西)来编写您的代码:
#!/bin/env bash
case $# in
0 ) dir='.' ;;
1 ) dir="$1" ;;
* ) printf 'Too many operands: %d\n' "$#" | tee -a 'err.txt' >&2
exit 1 ;;
esac
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