sed: insert or append line after matching line








  • Original text file: 1.txt:
    abc
    def
    ghi
  • To insert line before line "abc":
    sed -i '/^abc/ i 111' 1.txt
    the result will be:
    111
    abc
    def
    ghi
  • To append line after line "abc":
    sed -i '/^abc/ a 111' 1.txt
    the result will be:
    abc
    111
    def
    ghi



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