echo removes leading whitespace in a Bash variable [duplicate]

问题

This question already has answers here:

I just assigned a variable, but echo $variable shows something else (7 answers)

Closed 2 years ago.

Newbie to bash here. I'm hoping to prepend a single whitespace to a variable in bash, currently I have the following, which doesn't seem to work:

space=`printf '%1s' ' '`
mystr='hello'

mystr="$space$mystr"
echo $mystr

So instead of printing out "hello", I would like the result to be " hello", which has an additional whitespace at the beginning. What's the correct way to do this? Thanks.

回答1:

The leading space is being removed by shell because of word splitting. Enclose your variable in double quotes to disable word splitting:

echo "$mystr"

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See this post: I just assigned a variable, but echo $variable shows something else

See these docs as well: Word Splitting and Field Splitting

来源：https://stackoverflow.com/questions/45088223/echo-removes-leading-whitespace-in-a-bash-variable