Both processes and threads are independent sequences of execution. The typical difference is that threads (of the same process) run in a shared memory space, while processes run in separate memory spaces.
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http://stackoverflow.com/questions/200469/what-is-the-difference-between-a-process-and-a-threadctrl+z
bg
disown %1
exit
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http://serverfault.com/questions/34750/is-it-possible-to-detach-a-process-from-its-terminal-or-i-should-have-used-slsof | grep 'DEL.lib'
lsof | grep 'DEL.lib' | sort -k1,1 -u
pour la libc : lsof | grep 'DEL'|grep libc-2.13.so|sort -k1,1 -u
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http://www.commandlinefu.com/commands/view/8579/find-out-which-process-uses-an-old-lib-and-needs-a-restart-after-a-system-update