Grep Strikes Again...

Grep : OR condition
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Eg:

Matching strings that starts with DOLLAR Symbol ($) and also match any of digits 1 or 1 or 3

cat | grep -E '^$1|2|3'

Grep AND Condition
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Eg:

Matching strings that starts with DOLLAR Symbol ($) and string "123"


cat | grep -E '^\$.*123'