The line content of the keyword SEM is appended to the beginning of the next keyword SEM

Problem:

Matches the line contents of the keyword SEM, appended to the beginning of the next keyword SEM

Text
SEM 1234
Point 23 33
Point AA
Point SD
Point FD
SEM 5412
Point TT
Point OQ
Point-IW
SEM 4513
Point 142 IWS
Point 142 AMX


Effect

SEM 1234 Point 23 33
SEM 1234 point AA
SEM 1234 point SD
SEM 1234 Point FD
SEM 5412 Point-TT
SEM 5412 point OQ
SEM 5412 Point-IW
SEM 4513 point 142 IWS
SEM 4513 Point 142 AMX

Answer:

awk '!/^sem/{print a,$0}/^sem/{a=$0} ' file

SEM 1234 Point 23 33

SEM 1234 point AA

SEM 1234 point SD

SEM 1234 Point FD

SEM 5412 Point-TT

SEM 5412 point OQ

SEM 5412 Point-IW

SEM 4513 point 142 IWS

SEM 4513 Point 142 AMX

This article is from the "Eight Miles" blog, so be sure to keep this source http://5921271.blog.51cto.com/5911271/1773793

The line content of the keyword SEM is appended to the beginning of the next keyword SEM