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egrep ignores begin of line on Mac OS X

Darwin UNIX commands doesn't always seem to follow standard rules, such as the "sed won't produce new line on Mac OS X " issue. I just found another exception:

$ echo "Contagion" | egrep -o '^.'

It's not suppose to do that. It completely ignored the beginning line character in the regular expression. The same example produced the correct result on Ubuntu Linux:

$ echo "Contagion" | egrep -o '^.'

Luckily, there is an easy work around that will work on both systems:

$ echo "Contagion" | egrep -o '^.' | head -1

Just wished I didn't have to resort to thtat.

Chieh Cheng
Fri, 20 Jan 2012 03:38:32 +0300

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