echo " lfj"|sed -e "s/^\s+//g"
lfj
I remember + indicates one or more, so there's two white spaces in front of lfj, why cannot it strip them?
You need to escape the +.
$ echo " lfj"|sed -e "s/^\s\+//g"
lfj
Basic sed uses BRE(Basic REgular Expressions). To make + to repeat the previous character one or more times in BRE, you need to escape it.
Enable the extended regexp option -r in sed to make sed to use ERE instead of BRE.
$ echo " lfj"|sed -r "s/^\s+//g"
lfj
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