command line - Kill all the other instances of a running process except the very first one - Ask Ubuntu

i working on project in need mplayer run several instances in order create voice-over-music real-time mixing 2 files. so, music playing @ 90% volume (represented "m" in next timeline) , @ moments lower volume ("m") in order place voice ("v") on music, after we'll return music 90% when voice sample finishes.

timeline (minutes)

0===========1===========2===========3===========4===========... _____________vvvvvvvv__________vvvvvvvvvvvvvv__________vvvvv... mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm... 

everything working pretty fine far. but, reason, many times second mplayer instance finishes voice-off playback process still remains active , won't ever end.

the answer provided right here: kill processes except 1 running script not working case.

i have tried accepted answer on question: https://unix.stackexchange.com/questions/50555/kill-many-instances-of-a-running-process-with-one-command kill every instance of mplayer , need keep first 1 playing music.

in page http://www.oracleflash.com/20/how-to-kill-all-processes-with-one-command-in-linux.html reproduce way kill processes initiated application. useful case kill instances of mplayer.

expected solution

i saving pid of music player with:

mplayer -shuffle -playlist playlist.m3u </dev/null >/dev/null 2>&1 & echo $! > player.pid 

with pid number, i'd use last given page's solution in order kill processes except 1 saved in player.pid file. so, placing cat player.pid in middle of

kill -9 `ps -ef | grep oraxpo | grep -v grep | awk '{print $2}'  

may trick.

the problem don't know place it. or if there different/better way it.

another idea kill last processes 1 @ once stopping on first one.

any ideas appreciated.

thanks in advance.

you can try:

pgrep mplayer | grep -vf player.pid | xargs kill -9 

notes:

• pgrep the tool looking process information. supports negating matches , using pid files, unfortunately couldn't figure out way selectively negate matches.
• since have file, have grep read file -f, , negate matches -v
• xargs converts input arguments, don't need use command subtitution