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question on egrep

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#4 (permalink)

Old

05-19-2006

jim mcnamara jim mcnamara is online now

jim mcnamara is online now

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Join Date: Feb 2004

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Posts: 5,759

This works:

Code:

 egrep '^(a)(a)?' filename

test:

Code:

kcsdev:/home/jmcnama> cat filename
a
aa
aaa
aaaa
aaaaa
aaaaaa
123456
ABCDEF



kcsdev:/home/jmcnama> egrep '^(a)(a)?' filename
a
aa
aaa
aaaa
aaaaa
aaaaaa

Note:

Code:

 egrep '^(a)+$' filename

is closer to correct - correct being 'find a line of any non-zero length that has only the letter a'

Last edited by jim mcnamara; 05-19-2006 at 04:36 PM..