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The meaning of '-' and '+' symbol when background processes are finished?

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linux-howto

http://unix.stackexchange.com – When I am running background processes like(I have 9 files suffixed by phastcon): for i in *.phastcon; do cut -f 2 $i >$i.value & done After kicking the "Enter", I get the output in terminal showing background id and process id, [1] 22917 [2] 22918 [3] 22919 [4] 22920 [5] 22921 [6] 22922 [7] 22923 [8] 22924 [9] 22925 But hen finished, I got [7] Done cut -f 2 $i > $i.value [8]- Done cut -f 2 $i > $i.value [1] Done cut -f 2 $i > $i.value [2] Done cut -f 2 $i > $i.value [3] Done (HowTos)