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Plzzzz, tell me some script about this...

What does this mean ?

sed '/^ */s///'
sed '/^/s// /'

and why it's diferent ???

sed '/ */s// /g' and sed 's/ */ /g'. It's all the same ???
...

I'm now studying as junior student in VSB-TUO university in Czech Republic. My teacher give me some tasks about sh programming. he always ask about : to access file, del sime string in this...or...