sed тоже акуенная утилита

 Удалить все строчки начинающиеся на “MAC” в файле tmp.txt:

sed /MAC/d tmp.txt

Заменить ‘string1’ на ‘line2’:

sed ‘s/string1/line1/’ file.txt

via http://gazette.linux.ru.net/rus/articles/abs-guide/a15696.html

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