I'd like to cut extra spaces from "ps aux" output and replace them with one space. What I do is:
ps axu | sed 's/[ ]+/ /g'
But output seems to be unchanged, I still get too much spaces between tokens.
username 4876 ... <the rest of columns ommitted>
Why this regular expression doesn't match empty space between username and pid?
Because sed uses basic regular expressions (BRE), and + isn't part of them. Use s/ */ / (two spaces in the pattern part), or -E for extended regular expressions in GNU or BSD sed: sed -E 's/ +/ /g'
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