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UNIX for Dummies Questions & Answers
egrep -e not working...!
Post 56051 by moxxx68 on Sunday 26th of September 2004 02:16:11 PM
09-26-2004
egrep -e file1 file2 does not work..
on this version of linux I am having a harder time with the command than I was having with linux 0.8 or 0.9 (redhat).. according to what I know I should be able to extract all the information from file1 to file2 which has only a portion of the file using egrep -e command.. like sed -for awk -f ;
sed -f file2 file1 ( will giive a script to file)
awk -f file2 file1 (will give relative commands to a file)
egrep -e file2 file1 ( will extract data from file 1 to file 2 as long as file 2 has data that is relevant to file1)
this is not worklng..
I am wondering if this is because of the version of the linux I am using, something I am doing wrong, or is this a different command option on this linnux flavor... and if it is what is it?
thanx moxxx68
ps .. i mentioned the flavor and version to calrify the actual software that I am using.. just in case that has something to do with it.. and also because usually in a situation where matters are a little unclear the first question is what type of software are you working with etc etc,,,
Last edited by moxxx68; 09-26-2004 at 03:21 PM..
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LEARN ABOUT SUNOS
switch_root
SWITCH_ROOT(8) System Administration SWITCH_ROOT(8) NAME
switch_root - switch to another filesystem as the root of the mount tree SYNOPSIS
switch_root [-hV] switch_root newroot init [arg...] DESCRIPTION
switch_root moves already mounted /proc, /dev, /sys and /run to newroot and makes newroot the new root filesystem and starts init process. WARNING: switch_root removes recursively all files and directories on the current root filesystem. OPTIONS
-h, --help Display help text and exit. -V, --version Display version information and exit. RETURN VALUE
switch_root returns 0 on success and 1 on failure. NOTES
switch_root will fail to function if newroot is not the root of a mount. If you want to switch root into a directory that does not meet this requirement then you can first use a bind-mounting trick to turn any directory into a mount point: mount --bind $DIR $DIR SEE ALSO
chroot(2), init(8), mkinitrd(8), mount(8) AUTHORS
Peter Jones <pjones@redhat.com> Jeremy Katz <katzj@redhat.com> Karel Zak <kzak@redhat.com> AVAILABILITY
The switch_root command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/. util-linux June 2009 SWITCH_ROOT(8)