06-18-2012
It looks like you're not using the quoting character. It should be ', not ’.
Note that the error is not from egrep; it's from bash. In the second example, since those backslashes do not occur within a quoted string, they are being interpreted by the shell, to whom they quote the following character. The special shell character generating the syntax error in the first example, (, in the second is quoted with a backslash, hence no syntax error.
Also, quoting aside, the second egrep's regular expression is incorrectly specified. Those backslash escaped characters are special by default in egrep's extended regular expression flavor; you only need to quote them if you want to match them literally. In grep's basic regular expression flavor, the situation is reversed: those characters are ordinary by default and need to be backslashed to become special.
Regards,
Alister
Last edited by alister; 06-18-2012 at 08:12 PM..
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