将字符串发送到标准输入 [英] Send string to stdin

问题描述

有没有办法在 bash 中有效地做到这一点:

Is there a way to effectively do this in bash:

/my/bash/script < echo 'This string will be sent to stdin.'

我知道我可以通过管道传输来自回声的输出，例如:

I'm aware that I could pipe the output from the echo such as this:

echo 'This string will be piped to stdin.' | /my/bash/script

推荐答案

可以使用一行heredoc

cat <<< "This is coming from the stdin"

以上同

cat <<EOF
This is coming from the stdin
EOF

或者你可以重定向命令的输出，比如

or you can redirect output from a command, like

diff <(ls /bin) <(ls /usr/bin)

或者你可以读为

while read line
do
   echo =$line=
done < some_file

或者干脆

echo something | read param

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