Thread: umountfs sed explanation

hello all,

trying understand shutdown unmounting process.
traced /etc/init.d/umounfs script seems responsible unmounting mounted partitions. however, not see how script unmounting partitions...

because don't understand sed well.
can explain

sed -n '0,/^\/[^ ]* \/ /p' /proc/mounts

doing?

understand prints selected lines somehow. condition?

1. read man page 0,addr2 portion, frankly, don't understand explanation.

" start out in "matched first address" state, until addr2 found. similar 1,addr2, except if addr2 matches first line of input 0,addr2 form @ end of range, whereas the 1,addr2 form still @ beginning of range."

2. pattern /^\/[^ ]* \/ / match?
isn't following?
line starts "/" followed non-space characters followed space , "/" followed space?

apparently understanding wrong, because first line of output is
rootfs / rootfs rw 0 0

guidance, , explanation why case highly, highly appreciated.

thank in advance.

hi,
understanding of pattern correct.

code:

0,/pattern/p

says print lines start of file first line matches pattern.

in short, printing contents of /proc/mount until & including mount point root of filesystem (ie. / )

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