如何编辑UNIX文件以在2个特定模式匹配后插入几行

Question

我有一个文件，其中包含如下内容。我想编辑文件，以便每当在文件中看到LTPGY模式，然后在"设置T表新$ M表"之后，插入一个新的线，其中包含"找到"的内容。

输入文件如下： -

  set ra [ 1 22 3 ] LTPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  set a [  $t process_axis]
  set a [  $t voltage_axis]

  set ra [ 1 22 3 ] STPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  set a [  $t process_axis]
  set a [  $t voltage_axis]

  set ra [ 1 22 3 ] LTPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  set a [  $t process_axis]
  set a [  $t voltage_axis]

  set ra [ 1 22 3 ] STPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  set a [  $t process_axis]
  set a [  $t voltage_axis]

我希望输出像： -

  set ra [ 1 22 3 ] LTPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  FOUND
  set a [  $t process_axis]
  set a [  $t voltage_axis]

  set ra [ 1 22 3 ] STPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  set a [  $t process_axis]
  set a [  $t voltage_axis]

  set ra [ 1 22 3 ] LTPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  FOUND
  set a [  $t process_axis]
  set a [  $t voltage_axis]

  set ra [ 1 22 3 ] STPGY
  set a 0
  set a1 1
  set t [ table new $m table]
  set a [  $t process_axis]
  set a [  $t voltage_axis]

Answer 1

与Gawk一起工作，未经测试的其他尴尬：

gawk '
    /set ra / {found = /LTPGY/}
    1;
    index($0, "set t [ table new $m table]") && found {print "FOUND"}
' file

Answer 2

这可能对您有用（gnu sed）：

sed '/LTPGY/{:a;n;/set t [ table new $m table]/!ba;p;s/S.*/FOUND/}' file

将重点放在LTPGY之后的线上并查找所需的字符串，然后用所需的字符串FOUND替换所有领先空间。