General :: Bash - Subtract Contents Of One Textfile From Another
Jul 7, 2010
I have two text files on Linux. One contains a list of valid IDs. E.g:
abcd
efgh
ijkl
etc.
The other contains a list of invalid IDs. But, some of these also appear on the list of valid IDs, in this example "efgh":
mnop
qrst
efgh
etc.
How can I easily construct a text file that contains all the lines from the invalid list that do not appear in the valid list? That is, I want to end up with a text file that has:
mnop
qrst
etc.
I'd like either some Linux commandline magic of some clever Vim trickery.
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May 15, 2011
How can i get bc to subtract negative numbers?
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Apr 28, 2010
I just need to perform a simple operation of subtracting two numbers - that aren't whole numbers, i.e 200.56 - 67.24attempting to use expr i merely get "expr: non-numeric argument"
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Feb 8, 2010
I have a text file example :
word1
word2
word4
[code]...
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Jun 10, 2011
I have a text file that contains a single word and I want to write a bash script that will read the word from the text file... The following is my incorrect attempt, as it assigns the name of the textfile to the variable as opposed to the word stored within the textfile:(assume I have a text file value.txt that has as its contents a single word, say wordone)
#!/bin/sh
for f in value.txt
do
echo $f
done
so the output of the above script is value.txt, however I want it to be wordone.to summarise: how do I assign the value of the word contained within a textfile to a variable?
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May 26, 2010
For reasons I won't get into, I need to copy directories so long as the average system load is low. Can someone help me write a BASH script that will copy the contents of a directory, but check to make sure the average system load is below X before copying each file, and if not, wait Y seconds and try again?
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Mar 9, 2010
I use avg free as antivirus scanner. I looked some time for a scanner to scan and remove viruses. Problem is avg 8.5 will only detect viruses, not remove them...I use a oneliner looking like this:
Code:
/usr/bin/avgscan / -x /mnt -x /dev --heur --ignerrors -r /var/log/"scanlog"`eval date +%Y%m%d`".txt"
[code]...
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Jul 4, 2011
just started with Linux and I'm trying to create new files for each line of my input file. So I have file with 637 lines of data:
2 4 6
2 8 5
3 0 5
etc
and want to create a new file from each line. With
cat name.txt | awk '{ line = $0
print line
}'
I nicely see all lines, but what rests is to save each line separately into new file. I tried While read line command in combination with output >> $.txt, but didn't work well..
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Dec 1, 2009
how I sould do the following?
I have a folder called "Downloads" and among its contents there are a bunch of files with "flv" extension.
If I do
Code:
ls path/to/Downloads/*flv
I will get something like this:
[Code]....
(The reason I want something like that has to do with a small script I'm trying to write).
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May 18, 2011
What bash command can I use to rename or change the extension or name of a batch of files (for example, from .php to .html)?
Furthermore, is there a simple bash or python script/command that can be used to open a batch of plain text files one-by-one, search for all instances of a specific word, and replace all of those instances with another word?
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May 18, 2010
I want to list the contents of a zip file amd put each entry into an array. I've been doing
[code]....
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Feb 11, 2011
Turns out I don't have bc in my Ubuntu distro and I can't install it. how to subtract two variables (BASH variables) from awk and set the result as another variable, e.g: finalvalue=`awk '{print $first - $second}'`
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Apr 1, 2010
need a script to achieve saving multiple text files as 0001 0002 0003 etc.or moving files to a folder displayed this way..there prolly is an " if " statement involved also...if 0001 exist then %+1 and so on.
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Feb 1, 2011
How can I put a value of a php variable into a text file. I cant append or write the values into a text file.
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Oct 12, 2010
i need to calculate the number of words containing letter e in a textfile.
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Nov 29, 2010
I create a bash script that writes another bash file. But in the generated bash file I want to write a bash command in the file and not executing it.Here's my bash file:
Code:
#!/bin/bash
cat > ~/generateGridmix2data.sh << END
[code]...
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Jul 17, 2010
below are the details of my system. I have bash as my current shell, some really common commands aren't working.
Do I need to do a re-installation of bash? Or how do I install a selection of bash commands which I need? (for example a subset of [URL])
Code:
root@sdptfw:~ # uname -a
Linux sdptfw.sdpt.co.za 2.4.36 #1 Tue Jul 22 13:13:24 GMT 2008 i686 i686 i386 GNU/Linux
root@sdptfw:~ # echo $SHELL$
/bin/bash$
[Code]....
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Jan 10, 2010
I have downloaded a .tar.gz file to my desktop, and then right-clicked and selected "extract here". how i can install it
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Jan 30, 2010
I am trying to use "hexdump" on the files in the /dev/ directory. This is ubuntu 9.10.There is some more in this forum: [URL]Hexdump returned small blocks of bytes or couldn't see the files even as root. I expected to see the actual data streams from the various devices. How come this doesn't work?
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Mar 17, 2011
There is one SVN server that I configured and is running fine. Its working over WebDAV on http. People can see the repositories and all. Now, I have created on repository and I want to add code to it which is not present with the developers as well. This is code is on some other test machine. It is not used for development but is test platform. Is there any way of transferring this code to the repo without developers copying it to their systems?
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Mar 12, 2010
1 List the contents of directory, /dev using a detail listing format and page by page.
2Mount the CDROM to the directory, /media/cdrom.
3 Delete the file "/home/student/myfile" without any confirmation (Assume you have the required file permission to delete this file).
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Jul 29, 2010
In Ubuntu 10.04, there is a certain file that appears highlighted in terminal. When I try to cat the file, it says there is no such file or directory. How can I see what's in this file? Is this a symbolic link?
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Jul 7, 2011
I would like to copy the contents of a directory into another. I don't want to copy the directory and all files and directories under it, but just the contents of the directory just as if it were a regular file. Doing cp -r target dest copies the directory and the entire hierarchy rooted in it. I get error if I do not include the -r option. (I am calling cp from within a C program.)
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Oct 20, 2009
how to do the listing of zip file contents using C?
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Nov 5, 2009
Is there a way to copy a directory (retaining the permissions and owners) without copying the contents of the directory?
If there is no such thing... then I need a way to determine if a target path is a file or a directory, and if it is a directory I need to make a new directory elsewhere that has the same name, owner and permissions.
Basically, I'm trying write a script to copy 200 GB of files over a network to a new server, and I'd like to do it by generating a list with the find command. That way, I can migrate large chunks of the files over the course of a week, and on the day of the migration generate a new list of files that changed in the last week and then copy just the chagned files over minimizing the down time. However, the list will contain directories that I can't just use the 'cp' command on because it will copy all the contents of the directory.
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Jun 7, 2010
how to copy 3 dir's content to 1 dir by crontab?suppose i want to copy /home/ftp1/* /home/ftp2/* /home/ftp3/* to /ftpdatathree ftp user data to one folder after every one minute by crontab methodso it goes like*/1 * * * * /bin/cp -rf ??? /ftpdata
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Jan 28, 2010
I have a USB drive that has a TON of folders on its root level. I want to remove all those folders and their contents except three of them. I know if I do rm -rf that will kill everything, is there a way to exclude three folders, say folder1 folder2 newfolder, and do it all in one statement?
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Jun 29, 2011
Am using the below script to send mails as an sql output . but the below script sends the generated file even if it is empty (if there is no outputs generated from the sql command) .
I want to send mail only if the file has some valid outputs. How to do this
{code}
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1
[code]....
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Jun 8, 2011
is there any API to read content of PDF file & store it in buffer?
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Oct 14, 2010
on a Linux pc I want to restore the contents of the DLT tape to /mnt directory,how to do itIf I just want to see the contents of the files, is it possible to read the contents irectly from tape without restoring to hard disk?
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