Actually, what I'm trying to do is remove duplicate pairs from a file like this:
I find out it doesn't really work if I redirect the file into a while-loop that uses read to read a line, like this:
I got the idea because while read works line by line from the beginning of the file the swapped line is always located behind the other one so if I remove it read will never see it. But apparently the entire original file is still available to read no matter what I remove.
Is there is a better approach?
Assuming the fields in your input file are whitespace separated, you could try this approach:
These 2 Users Gave Thanks to Scrutinizer For This Post:
Hi All,
Very need help about format syntax on solaris 10.
I have done install Solaris 10 OS on sun fire v245 but currently i have a problem to use "format" command to display partition info for my hard drive.
i cannot enter the format menu, below is captured display :
# format
Searching... (7 Replies)
Hi all,
Just subscribed to this forum. Not a regular user of Unix.:)
I did the following:
We have a directory structure /a/b/c5/
Where c5 is the only directory inside b.
export ANOOP=/a/b/c*/
echo $ANOOP=/a/b/c5/
I have to create a symbolic link to anoop.txt in the directory... (2 Replies)
Hiii... There...
I am making a Script in which I am taking the value of a variable "var"
through key board.
But I want, if no values are supplied for "var" for more than 5 seconds then script shuld automatically exit.Script is as follow :
#cat abc
#!/bin/bash
echo "Enter Your Choice : "... (4 Replies)
I am looking at installing PiKdev which needs libqt3-mt and kdelibs4-dev. The installed package is qt-r1008952-i486-1 which claims to be a gui toolkit. find / -name "*libqt*" yields nothing with mt just a lot of support, compatible, and access widgets. Normally I would consider this a no go but... (0 Replies)
Hi,
I am a little bit confusing of using find command.
Actually, I am planning to delete the files whatever the files are existing in the day before yesterday. So, I am writing the command like this.
find . -name "*.txt" -ctime -2 { here I am confusing, if I will use +2 or +1 also I am... (5 Replies)
Sed garbled error. Cannot determine why the sed command to insert a line at the beginning of a file will not work on declared variables.
outfile='DAR.V2.2012115.1.CSV'
testfile='totality_request.sql'
header_prefix='DATA FILE'
no_ext_file=`echo $outfile |sed 's/\(.*\)..../\1/'`
... (6 Replies)
I'm trying to extract a subject from a mail message but my subject example has 2 lines. How can I manage to extract it and write a string at the end of it?
Consider this example:
From: test@domain.com
Subject: Re: U =?ISO-8859-1?Q?qu=EA=3F!=3F!=3F!!_wtff_=E7=E3o_=ED=F3?=
... (6 Replies)
Hi,
I ran a script named cat item
when I searched for this script using command PS
I get two process . I don't understand this. Also this script has run for 15 minutes but the time is showing as 0:00:confused::confused:
ps -ef | grep cat_item
catmgr 4508 4486 0 05:10:29 ? 0:00... (5 Replies)
1. increase file space
first, double space a file:
awk '1;{print ""}'
I probably can understand it:print a blank line every time.But when I read triple space a file I am confused:
awk '1;{print "\n"}'
doesn't it meaning print a blank line every time too?
2. number each line of file, but... (6 Replies)
Discussion started by: hhdzhu
6 Replies
LEARN ABOUT DEBIAN
mhddfs
mhddfs(1) General Commands Manual mhddfs(1)NAME
mhddfs - The driver combines a several mount points into the single one.
SYNOPSIS
mhddfs /dir1,/dir2[,/path/to/dir3] /path/to/mount [-o options]
mhddfs /dir1 dir2,dir3 /mount/point [-o options]
...
fusermount -u /path/to/mount
fstab record example:
mhddfs#/path/to/dir1,/path/to/dir2 /mnt/point fuse defaults 0 0
mhddfs#/dir1,/dir2,/dir3 /mnt fuse logfile=/var/log/mhddfs.log 0 0
OPTIONS
with an -o option1,option2... you can specify some additional options:
logfile=/path/to/file.log
specify a file that will contain debug information.
loglevel=x
0 - debug messages
1 - info messages
2 - standard (default) messages
mlimit=size[m|k|g]
a free space size threshold If a drive has the free space less than the threshold specifed then another drive will be choosen while creat-
ing a new file. If all the drives have free space less than the threshold specified then a drive containing most free space will be
choosen.
Default value is 4G, minimum value is 100M.
This option accepts suffixes:
[mM] - megabytes
[gG] - gigabytes
[kK] - kilobytes
For an information about the additional options see output of:
mhddfs -h
DESCRIPTION
The file system allows to unite a several mount points (or directories) to the single one. So a one big filesystem is simulated and this
makes it possible to combine a several hard drives or network file systems. This system is like unionfs but it can choose a drive with the
most of free space, and move the data between drives transparently for the applications.
While writing files they are written to a 1st hdd until the hdd has the free space (see mlimit option), then they are written on a 2nd hdd,
then to 3rd etc.
df will show a total statistics of all filesystems like there is a big one hdd.
If an overflow arises while writing to the hdd1 then a file content already written will be transferred to a hdd containing enough of free
space for a file. The transferring is processed on-the-fly, fully transparent for the application that is writing. So this behaviour simu-
lates a big file system.
WARNINGS
The filesystems are combined must provide a possibility to get their parameters correctly (e.g. size of free space). Otherwise the writing
failure can occur (but data consistency will be ok anyway). For example it is a bad idea to combine a several sshfs systems together.
Please read FUSE documentation for a further conception.
COPYRIGHT
Distributed under GPLv3
Copyright (C) 2008 Dmitry E. Oboukhov <dimka@avanto.org>
February 2008 mhddfs(1)