Shell脚本Sed-仅在首次出现字符串时，如何读取文件并在另一个文件中写入？

Question

I am trying to read the content of the file test.txt and write in another file Report.html, only in the first match of a string. Something like:

sed -i '/, past/r test.txt' Report.html

This command above is reading all strings ", past" and including the content of the test.txt in all strings ", past". But I just want that includes in the first occurrence of the string ", past". A command like:

sed -i '0,/, past/r test.txt' Report.html

The command above is not working, what's the correct syntax for that?

Answer 1

As the sed r command does not take range, and sed control does not otherwise allow "first only", I think you need to "calculate" the line number of interest and feed that to sed:

sed -i $(awk '/, past/{print NR;exit}' Report.html)'r test.txt' Report.html

Only do this if you're guaranteed that , past occurs in Report.html somewhere. If not, store the $(awk...) result in a variable and check it first. Otherwise the sed will do the include for every line.