在这里使用两个字符串

Question

我可以使用herestrings将字符串传递给命令,例如

cat <<< "This is a string"

如何使用herestrings将两个字符串传递给命令？我该怎么办呢

### not working
diff <<< "string1" "string2"

### working but overkill
echo "string1" > file1
echo "string2" > file2
diff file1 file2

Answer 1

您不能使用两个herestrings作为同一命令的输入.实际上,最新版本将取代所有其他版本.示范:

cat <<< "string 1" <<< "string 2" <<< "string 3"
# only shows "string 3"

另一方面,如果您想要的是两个直接输入,您可以这样做:

diff <(echo "string 1") <(echo "string 2")