Question

我要改变:

inlet
{
    type    patch;
    ...
}
outlet
{
        type  patch;
}

纽约总部

inlet
{
    type    wall;
    ...
}
outlet
{
        type  patch;
}

As a first attempt 纽约总部 achieve this, I tried 纽约总部 limit the range between inlet and outlet and replace "patch" with wall. echo "inlet { patch } outlet" | sed "/^(inlet [^ ]) . ([^ ]*)$/s//1 wall 2/" which gave output : inlet { wall outlet The last curly bracket is missing. I came up with this searching this forum and not quite sure of meaning of every command.

Answer 1

Whether or not this solution is appropriate will depend on your actual data, but based on your example, one potential option is to use awk and change the record separator:

cat test.txt
inlet
{
    type    patch;
    ...
}
outlet
{
        type  patch;
}

awk  BEGIN{RS="^[[:alpha:]]"} /inlet/ {sub("patch", "wall", $0); print} !/inlet/  test.txt
inlet
{
    type    wall;
    ...
}
outlet
{
        type  patch;
}

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