Software :: Swap The First And Second Column In A File?
Feb 3, 2011
I have a file in the following format
item1 item2 attrbute1, attribute2, line1
item1 item2 attrbute1, attribute2, line2
item1 item2 attrbute1, attribute2, line3
item1 item2 attrbute1, attribute2, line4
item1 item2 attrbute1, attribute2, line5
Question: what command can I use swap item1 and item2 around and keep the attributes in place.
A space seperates the first and second column. The file has many hundreds of lines in which these need to be swapped
Output needs to be as follows:
item2 item1 attrbute1, attribute2, line1
item2 item1 attrbute1, attribute2, line2
item2 item1 attrbute1, attribute2, line3
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Mar 20, 2011
Does one need to Check the Swap filesystem, from time to time
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Aug 16, 2010
RAM for older machines like I use is fairly cheap these days. But flash memory is just as cheap or cheaper. So I'd like to ask about the feasibility of expanding my system's memory using flash memory. And about whether creating a partition for swap on the flash memory, or whether a swap file on the flash device, is the better way to go.
By flash memory I have in mind mainly USB sticks or what are sometimes called "pen drives." But I do also have CF and SD cards that, with the proper cheap adapter (one of which I already own for adapting CF) could be used to create extra swap space. So, what is the current consensus on the feasibility/advisability of using flash memory for swap? I've read about the limited write cycles of flash being an argument against using it for swap. But recent reading indicates to me that the limited write cycles problem applies mostly to older, smaller-capacity flash memory. Some will come out and say that, for larger-capacity flash memory, the life of the device is likely to exceed the amount of time your current computer will be useful (I think I've seen estimates in the range of 3-4 years life--minimum--for newer, higher-capacity flash memory).
A more persuasive argument I've heard against using flash memory for swap is that access times for these devices can be much slower than SATA, and maybe even IDE, hard drives. That would certainly dictate against using flash memory for swap.
So, how about some input on this issue? Anyone using flash memory for swap? If so, what kind (e.g., usb stick or SD/CF)? Are you using a swap file or a swap partition? How's system performance? Likewise, has anyone had flash-memory-used-as-swap die on them? The consequences would undoubtedly be dire. Also, has anyone measured flash memory access times to confirm or refute claims about slow access times? Are some types of flash memory better/worse than others in terms of access times?
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Jul 19, 2010
How would i calculate following values.Initial file
10 3
20 4
How would i calculate 3rd column which should be addition of value in 1 and 2nd column.File after calculation
10 3 13
20 4 24
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Jul 15, 2010
I have a multicolumn datas, like
a1 b1 ... f1
a2 b2 ... f2
. . ... .
[code]...
I would like to make a file with all these data in one column, like
a1
a2
.
.
[code]....
Can it be done with awk or some other command? Also, is it possible then do add another column in front of this one with numbers of the lines (for every previous column), like
1 a1
2 a2
. .
. .
[code].....
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Apr 26, 2010
I have some series of files, which actually named bellow
<day_month_yr>_<hh:mm:ss>.<host_name>.<IP.ip.ip.ip>.<log_name>.txt
I want to show this file name below the column may be
Date Time Host_Name IP_address Login_Name
----- ---- --------- ---------- ----------
<day_month_yr> <hh:mm:ss> host_name x.x.x.x log_name
...
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Sep 4, 2010
Code:
#!/bin/bash
ls -lhGg | while read line; do echo "$line"; done | awk ' { print $3" "$6 } '
what i want to do is be able to print column 3 and every column greater then 5. Has to be to the end of the line, since different filenames can have different amounts of words in them and the blank space is the separator. my current code works just fine if the file has no blank space.
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Apr 28, 2011
I have a text field that is just list of servers and I need to add the word hostname in front of them... It must be brain fart but I can't think of how to do this. Basically I need this:
server1
server2
server3
To this:
hostname server1
hostname server2
hostname server3
(And I just mean simply the word "hostname")
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Oct 15, 2010
How can I extract 5th column from a file without the header.
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Apr 25, 2011
I was trying to redirect the output of two variables to different columns of a .csv file in MS excel like this,
Code:
echo "$a $b" > abc.csv
But I am getting both $a and $b in the same column, is there anything I can use instead of to move the value of $b to the next column? Or is there a good different approach to do it?
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Jul 13, 2011
I have a file like:
ER- V67
ER+ V68
ER- V69
ER+ V70
[Code]....
I am using the code:
sort -k1
but it prints it by sorting the second column.
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Jul 17, 2011
I have 2 large text files , one looks like this:
<contact type="1">blahblah@hotmail.com</contact>
<contact type="1">blahblah2@hotmail.com</contact>
<contact type="1">blahblah3@hotmail.com</contact>
The other is a list of emails in single column format like this:
emailaddy@hotmail.com
emailaddy2@hotmail.com
emailaddy3@hotmail.com , etc
Is there a command to delete all the blahblah emails from text file 1 and replace them with the ones from text file 2?
Or maybe a linux version of 'Csved' which has the ability to add,remove,insert columns?
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Jul 2, 2010
i have a script to read a file and get each column with varibles.actually my file: hplog1 sample 3 lines consists of
client1_day- 2010
jan
client2 2009
[code]....
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Nov 5, 2009
I have a file that stores employee login IDs, names, types, and permissions. Our software reads the information based on byte-columns, so it reads a column as any ASCII character (spaces, letters, numbers, punctuation, etc.). I want to create a web-interface for adding and removing users, and storing the data in a MySQL database. However, if I am creating the files from the MySQL output, I need a way to write to specific column locations in the file ...
User ID: Columns 1-4
User Name: Columns 6-30
Type: 32-40
Permissions: 42-45
I want to use a scripting language, preferably C-Shell, to call MySQL for the data and write the data to the correct columns of the file. I wrote a script that takes the data from the file, and dumps it into the MySQL table, so maybe I can pad the remaining space in the table column to fill with spaces ...
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Mar 22, 2010
I have this .txt file
3183630 R
3574216 W
5264994 M
2656889 A
I want to sort it by the numerical order of column. After sort, I wish to get output like
2656889 A
3183630 R
3574216 W
5264994 M
anyone knows how to use sort to do that? or any other command?
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Aug 1, 2011
I tried to come up with a thread title that was specific without being too long or cryptic. Don't think I succeeded. In my PHP error log I keep getting this error over and over again:
Code:
EntityRef: expecting ';' at line 565, column 81
It's very odd to me that it doesn't contain any sort of stack trace or file info. I know which of my virtual hosts and therefore which directory it's coming from, and it's happened now on half a dozen different servers that this site has lived on. So obviously I'm trying to track it down and add the missing ';' to the right file. This directory has dozens of sub-directories and hundreds of files though.
This is the best I've managed to come up with so far:
Code:
find . -type f -iname "*.php" -print -exec awk 'NR==565' {} ;
(I've run it both with and without the -iname filter.)
I get a very large list of files, and some of them display the contents of line 565 after them. I've checked through a number of them there, but haven't found the culprit. Is it possible to limit my "find" command to only files that have at least 565 lines? Is it possible to have it only print matches from line 565 that has at least 81 columns? How would I modify that to print perhaps 5 lines on either side (in case the error reporting is pulling a slightly different line.)
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Mar 7, 2010
i use this script to get the time and date of back and fourth transactions for a particular execution id. I use a substr command on the 5th column to to cut the milli seconds off the time value. - otherwise the times would look like 08:30:04.235
grep <executionID> <auditfile> | awk '{ print $1, $2, $3, $4, substr($5,1,8}
FIX -> Mon 3/1/2010 08:30:04
FIX <- Mon 3/1/2010 08:32:36
FIX <- Mon 3/1/2010 08:35:08
[code].....
anyhow - i append two sed commands to further clarify the direction of the message.
awk '{ print $1, $2, $3, $4, substr($5,1,8} | sed -e 's/->/ ->IN/g' | sed -e 's/<-/<-OUT/g'
FIX -> IN Mon 3/1/2010 08:30:04
FIX <- OUT Mon 3/1/2010 08:32:36
[code]....
I tried using an awk gsub () command within the string instead of the two seds, but it did not work:
awk '{ print gsub(/<regex>/, <replace with>,$1), $2, $3, $4, substr($5,1,8}
the sed works ok, but it would be cooler to make the replacement within the awk command:
gsub(/->/,-> IN, $1)
Is there a way where i could replace the value of the $1 column in the awk print string?
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Jul 1, 2010
I would like to know how to make the file browser column width smaller than I can normally adjust with the mouse. I have minimized with the mouse, it is still too wide. Is there a minimum column width setting I am supposed to specify somewhere?
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Mar 8, 2010
shell commands for such two goals?
In a tab-delimited file,
Code:
1aIa11aa
2bIIa22aa
1cIIIaabcaa
4dIVaabcaa
1. How can I find the non-unique values in the 1st column (1, in this case)?
2. How can I find the non-integer values in the 5th column (abc, in this case)?
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Jan 7, 2011
All I want is a command that reads one data file with several columns and prints it in another one.However, whenever the value in one specific column alters, it prints one empty line in the new file. For example, consider the file
2.54000000 2.54000000
2.54000000 2.54000000
2.54000000 2.54000000
2.54000000 2.56000000
[code]....
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Jun 13, 2011
I am trying to import a data file from old DOS application into MYSQL table The file is clear text file with fixed-width columns, without column delimiters
Example file :
Code:
4444333666666
2222666555555
iiiiwwwcccccc
[Code]...
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Mar 19, 2010
I am using ubuntu 9.04 on my laptop from past 8 months. These days when I boot my laptop, The booting process takes more time on the following step:
Activating swap file
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Aug 17, 2010
I'm having problems using a swap file to increase swap space in Linux. I followed the instructions for creating a swap file, as shown here:
[URL]
It works, and I increased my swap space. But when I reboot, I'm back to the original amount of swap space I had before. The swap file I created is still there, but it's not being used as swap space. I tried remounting the swap file but it doesn't work.
Also, it seems there isn't an fstab entry created for the swap file. Strange, huh? I don't think it made a difference but I manually copied the UUID for the swap file and made an entry in fstab.
I may be wrong, but from what I can tell the UUID of the swap file keeps changing every time I reboot.
So basically every time I reboot I have to repeat the instructions shown above to get more swap space.
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Jan 31, 2011
I have read somewhere, that Ubuntu can not suspend itself into a swap file, is that true?
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Feb 25, 2010
I have a csv file of my students' names, but they're listed in the Asian order (last name, first name) and I need to list them in English order (first name, last name).
I know I can use something like awk, but that's usually substituting one thing for another. How can I get it to modify the names in a column in a csv file and swap the order? code...
I would want to switch "Tanaka Hiroto" to read "Hiroto Tanaka". There's about 500-600 names in the list, so doing this using CLI would save a lot of time.
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Feb 1, 2010
I want to move my swap file onto a new extended hard drive.
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1243 9984366 83 Linux
/dev/sda2 1244 1305 498015 5 Extended
/dev/sda5 1244 1305 497983+ 82 Linux swap / Solaris
I want to put a 2Gb swap file on sda2.
> dd if=/dev/sda2 of=/mnt/2Gb.swap bs=1M count=2048
0+1 records in
0+1 records out
1024 bytes (1.0 kB) copied, 0.000388458 s, 2.6 MB/s
Why is this only copying 1.0kB? Do I need to format the extended drive first? I have tried specifying the block size and count a number of different ways with the same results.
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May 20, 2010
Currently running 10.04 and Cacti latest version and although my RAM is only just over 3/4 used my swap file is growing. If I leave the box running for about a week the swap fills and the system grinds to a halt.Is there some way of seeing what's in the swap so I can debug the problem and get my system more stable again?
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Oct 20, 2010
a possibly preposterous question. I am aware that you can designate a swap file or swap partition on your hard drive that linux uses as "memory". Suggested sizes for the swap file that I've seen range up to about 1024MB. Is there a limit to the swap file size that you can set?Basically I am running a perl script that processes a massive B) file (DNA sequence data), etc, and requires around 48 GB of memory to run, maybe a bit less. So, would it be possible to set a swap file to a massive, ridiculous size (~60GB oratever) and successfully run such a script on a desktop?Yes, I am aware that it would massively ow down the process. The thing is, if the perl script normally completes in about half an hour, and I can get it working on a desktop, I don't mind if it takes days or weeks to complete. I really don't. That's because it takes days or weeks to get access to a computer with the required grunt to do it.So, is this a stupid idea? Is it even possible? If so, given a perl script that normally completes in a half hour on a 48G system, if you do this, would it take days? weeks? decades
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Nov 2, 2010
I currently have Ubuntu Desktop 10.10 installed and have a great setup. However, I'm trying to install another OS on the hard drive and need to remove a partition. I've read online that I can remove the Swap partition and use a "Swap file". My question is this: Is it possible to replace the Swap partition with a "swap file" without having to re-install linux?
Dual-booting: Mac OS X 10.6.3 / Ubuntu Desktop 10.10
Macbook Pro 6,1
2.8 GHz Intel Core i7, 4 GB RAM
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Jan 14, 2010
Should the swap file be as large as possible or as small as possible providing a person has 8GB of installed ram.
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