Thanks much, highly informative. On Sun, 30 Dec 2018, David wrote: > Date: Sat, 29 Dec 2018 18:18:41 > From: David <bouncingc...@gmail.com> > To: debian-user <debian-user@lists.debian.org> > Subject: Re: e2fsck detail check > Resent-Date: Sat, 29 Dec 2018 23:19:07 +0000 (UTC) > Resent-From: debian-user@lists.debian.org > > On Sun, 30 Dec 2018 at 05:20, Jude DaShiell <jdash...@panix.com> wrote: > > > > I have a question about the -c fd command line switch. Would the valid > > options for fd be stdin stdout and stderr? > > The file descriptor fd is a number. It is defined by the parent process. > The parent process is typically the shell you use to start e2fsck > interactively, or the shell script that starts e2fsck. > > You can read about file descriptors here: > http://mywiki.wooledge.org/FileDescriptor > > The e2fsck man page also explains that if you precede the > fd number with a minus sign, then e2fsck will defer writing to the > file descriptor until it receives a SIGUSR1 signal. This is a > extra feature specific to e2fsck that has nothing to do > with file descriptors in general. > > You can read about signals here: > http://mywiki.wooledge.org/SignalTrap > >
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