How about a method that uses more shell functionality:
Code:
lineno=0
ulast=blah
sort -u myfile | while read s
do
set -- $s
case $1 in
$ulast) continue;;
user*) ;;
*) continue;;
esac
let lineno=lineno+1
echo $lineno $1 $3 $6
ulast=$1
done
:confused: There is a flat file on my system which contains email addreses of people in my company. This file is utilized when sending notifications for various things. However nobody knows where this file is located or what it is named. The only thing we know is the email address of a user who... (4 Replies)
I have two files ( eg. file1 and file2 ) , its contents are as below , I want to find out the same content ( same word ) in the two files , in the below example , the same content is "aaa" , could suggest how to do it ? thx.
#vi file1
aaa
bbb
ccc
ddd
#vi file2
111
222
333
aaa (4 Replies)
i have two single column text files a and b. in this two files, there are some overlap content, is there any quick way I can find out those overlapped content?
example, file a
1
2
3
4
5
6
file b
2
35
7
8
4
2 and 4 are overlapped in these two files so they should be picked up. (3 Replies)
Hi,
I am trying to find the content of file using grep and find command and list only the file names
but i am getting entire file list of files in the directory
find . -exec grep "test" {} \; -ls
Can anyone of you correct this (2 Replies)
Hi,
Long list of Input file1 content:
1285_t
4860_i
4817_v
8288_c
9626_a
.
.
.
Long list of Input file2 content:
1285_t chris germany
8288_c steve england
9626_a dave swiss
9260_s stephanie denmark
.
.
. (14 Replies)
Hi,
i would like to find 'AppManage' in all files. i have tried the following but it didn't work.
/local/home/mani>grep -iR 'AppManage' *.* - not outcome
/local/home/mani>grep -iR 'AppManage' - this one hangs
thanks (3 Replies)
Hi,
I am working on one script..I am having files in the below format
file 1 (each line is separated with : delimeter)
SPLASH:SPLASH:SVN
CIB/MCH:MCH:SVN
Now I want from file 1 that most left part of the first line will store in... (6 Replies)
Hi,
I am having trouble while using 'sed' with reading files. Please help. I have 3 files. File A, file B and file C. I want to find content of file B in file A and replace it by content in file C.
Thanks a lot!!
Here is a sample of my question.
e.g. (file A: a.txt; file B: b.txt; file... (3 Replies)
I have two files named Before.txt and After.txt:
Now i want to find the difference in content between <Marker 1> and <Marker 2> in the two files.
---------- Post updated at 05:00 PM ---------- Previous update was at 04:50 PM ----------
Any help will be highly appreciated..:) (3 Replies)
hi all,
i had the below script
x=`cat input.txt |wc -1`
awk 'NR>1 && NR<'$x' ' input.txt > output.txt
by using above script i am able to remove the head and tail part from the input file and able to append the output to the output.txt but if i run it for second time the output is... (2 Replies)
Discussion started by: hemanthsaikumar
2 Replies
LEARN ABOUT MOJAVE
pivot_root
PIVOT_ROOT(8) System Administration PIVOT_ROOT(8)NAME
pivot_root - change the root filesystem
SYNOPSIS
pivot_root new_root put_old
DESCRIPTION
pivot_root moves the root file system of the current process to the directory put_old and makes new_root the new root file system. Since
pivot_root(8) simply calls pivot_root(2), we refer to the man page of the latter for further details.
Note that, depending on the implementation of pivot_root, root and cwd of the caller may or may not change. The following is a sequence for
invoking pivot_root that works in either case, assuming that pivot_root and chroot are in the current PATH:
cd new_root
pivot_root . put_old
exec chroot . command
Note that chroot must be available under the old root and under the new root, because pivot_root may or may not have implicitly changed the
root directory of the shell.
Note that exec chroot changes the running executable, which is necessary if the old root directory should be unmounted afterwards. Also
note that standard input, output, and error may still point to a device on the old root file system, keeping it busy. They can easily be
changed when invoking chroot (see below; note the absence of leading slashes to make it work whether pivot_root has changed the shell's
root or not).
OPTIONS -V, --version
Display version information and exit.
-h, --help
Display help text and exit.
EXAMPLES
Change the root file system to /dev/hda1 from an interactive shell:
mount /dev/hda1 /new-root
cd /new-root
pivot_root . old-root
exec chroot . sh <dev/console >dev/console 2>&1
umount /old-root
Mount the new root file system over NFS from 10.0.0.1:/my_root and run init:
ifconfig lo 127.0.0.1 up # for portmap
# configure Ethernet or such
portmap # for lockd (implicitly started by mount)
mount -o ro 10.0.0.1:/my_root /mnt
killall portmap # portmap keeps old root busy
cd /mnt
pivot_root . old_root
exec chroot . sh -c 'umount /old_root; exec /sbin/init'
<dev/console >dev/console 2>&1
SEE ALSO chroot(1), pivot_root(2), mount(8), switch_root(8), umount(8)AVAILABILITY
The pivot_root command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux August 2011 PIVOT_ROOT(8)