Insert some text after Nth matching pattern using sed

爱⌒轻易说出口 提交于 2019-12-01 13:11:52

Does the following work for you?

sed ':a;$!{N;ba};s/\(foobar\)/\1\nsome_text/4' inputfile

For the input:

$ cat inputfile
line
foobar
foobar
foobar
line
foobar
line
foobar
line
foobar
line

This would generate

$ sed ':a;$!{N;ba};s/\(foobar\)/\1\nsome_text/4' inputfile
line
foobar
foobar
foobar
line
foobar
some_text
line
foobar
line
foobar
line

Use -e on FreeBSD:

sed -e :a -e '$!N' -e '$!ba' -e 's/\(foobar\)/\1\nsome_text/4' inputfile

an awk version:

 awk '/foo/{x++} x==4{sub(/foo/,"&some_text")}1' file

example:

kent$  cat file
foo
foo
trash
foo
trash
foo
foo
foo

kent$  awk '/foo/{x++} x==4{sub(/foo/,"&some_text")}1' file
foo
foo
trash
foo
trash
foosome_text
foo
foo
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