General :: Save The Output To A Log File Without Wiping The Previous Contents?
Jul 25, 2010
For example, I run a program called "luck" and it outputs a sentence like "good luck". Then "./luck -> logfile" will save the output content to logfile.But when I run another program called "hello" and it outputs a sentence lie " Hello world".Then "./hello-> logfile" will save the output content to logfile and wipe the previous contents.Is is possible to keep both sentences in the logfile? Just like
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Oct 26, 2010
I know how to redirect the output of a terminal to a file. For example, if I want to list all the files in ~/Documents and output to a file called test.txt, I would do this: ls ~/Documents > test.txt The question is, can I copy the output to test.txt AFTER I have carried out the command? This would mean that I wouldn't have to know in advance whether I want to copy the output to file. I want to do something like this: ls ~/Documents Then this: <bash command for copying standard output to test.txt>
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Jul 1, 2010
I am using:
user@unknown:~$ sudo command -option > log
to save the results of "command" to the file "log", but I'd like to also get the result on the terminal, is this possible?
I am using ubuntu 10.04 lts.
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Feb 28, 2011
My employer issues pdf files with everyones work schedules. I copy the content and save it as plain text in a file called unformatted (hope to be able to automate this step someday). Im working on a SED script that reduces unformatted to only display what I want to see and saves the result in a file Iïve named formatted. After that I have to manually copy formatted and save it with that days date as a filename e.g. 2011-02-25 or whatever day is scheduled in the pdf, for use on a mobile device (Nokia N900). I noticed that the date occurs on certain lines in the file so I added a line like:
sed -n 's/^Date: (201[1-9])/([0-1][0-9])/([0-3][0-9]).*/1-2-3/p' < unformatted >theDate
That creates a file theDate with the date in it that I wish to use as the filename for this particular instance. So I would like to skip the file formatted all together and have the sed- script write to a new file using the content of the Date as a filename, but how do I make that happen? And of course it would be more elegant if I could skip the intermediate theDate file as well.
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Mar 15, 2011
I sometimes stick my neck out and provide somewhat detailed, and often risky, "Mr-fix-it" remedies for boot problems. Now, I know it's possible to amend each command with "whatever_command > whatever.txt" in which case it'll place the command output in a file in /home.
But if you're directing someone to run a lot of commands as I did here is it possible to save the output of all commands to a .txt file without amending each command?
Or is it already saved somewhere that I'm not yet aware of? I wouldn't be surprised if the latter were true, I just haven't yet found it
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Jul 11, 2011
I've shell bash file script and I want to save the output into a txt file.I Know ./bash.sh > output.txt will save the result into a file but i want to add something into a bash file and then when the bash file process completed, it save the result into a file and I don't want that overwrite the output into the old file, I want each time i run it, it save the result into a new file.
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Mar 26, 2011
For example, when using bash you can use
Code:
to execute the previous command or
Code:
!<number> to execute the Nth command(use history to see the list). Or you can use
Code:
cd !-2:1
to cd into the value in the first field that was executed 2 commands ago Anyhow, say I run a command and the output is a path. Any way to cd and then some variable where OUTPUT of the previous command was stored? A variable that always stores the OUTPUT of the last command.
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Mar 10, 2011
I have a bash script that i created for a colleague to configure the servers he installs. It does package installations, modifies some config files, creates directories.
The problem is sometimes he says that the script skips some steps. There are some steps that require user input and i think he chooses wrong option. (i have tested the script and it works fine).
My question is how can i save the output in a file (or log) so i can check if there are error? I know about the ">>" operators but will this "script.sh >> output.txt" still bring the dialogs for user input (like read input from shell and mysql password dialog from install package)? And how can i record everything he inputs?
I read about logger, but since there are a lot of commands do i have to log every command or can i just log the whole script.
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Apr 23, 2010
Consider a situation in which you want to display only specific lines of contents from a file or of a command's output. Yes, we have head and tail commands. But, how to view all the lines of a file except the last one or vise versa when we don't know the count of lines in advance?
Consider this output:
Code:
[root@localhost ~]# ps au | grep bash
root 6316 0.0 0.0 4672 1440 tty1 Ss+ Apr22 0:02 -bash
root 20847 0.2 0.0 4672 1432 pts/0 Ss Apr23 0:12 -bash
root 21167 0.0 0.0 3920 660 pts/0 S+ 01:00 0:00 grep bash
Here, I don't want the last line (in italic) to be included in the result since the last line is due to "grep bash" in the devised command "ps au | grep bash". Well, we can rewrite the devised command:
Quote:
"ps au | grep bash | head -n 2"
But, again, here we are specifying the count of lines to be included. But, in the presented problem we don't know any count in advance!
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Feb 3, 2010
I would like to grep two numbers out of a text file, and divide them.
Here is the script code...
It feels like grep saves a new line too? or what is happening? i simply can't divide them, as it handles the variables as they are empty (and prints the two numbers although they were not printed
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Feb 8, 2010
After running the following command, I get:
[root@yukiko /]# find / -iname .bashrc
/home/clamav/.bashrc
/home/vpopmail/.bashrc
/etc/skel/.bashrc
/root/.bashrc
But I would like to have a command that prints a specific line by supplying the command with the line number, for example:
[root@yukiko /]# find / -iname .bashrc | getline(2)
/home/vpopmail/.bashrc
Is there such a command on CentOS?
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Jan 10, 2010
I want to export of the current default keyring (wireless network passwords etc.) and import it to another ubuntu 9.10 release on another computer but I can't seem to find much on the subject. Does anyone know how to do this?
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Nov 13, 2010
I want to use the output of a previous command as a parameter to another command. For example: to know where "nice" is stored i typed: which nice output: /usr/bin/nice now the second command i typed is: ls -l /usr/bin/nice Is there a way to have a single command like: ls -l which nice ?
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Jun 15, 2010
I would like to know how I can replace a string in one file with the complete contents of another life.
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Feb 18, 2011
I have one previously compiled apache server from source. I would like to know is there any option to get previous configuration file from /etc/httpd/.
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Sep 25, 2010
someone once told me that use can pass a file to grep and use that to search the contents of another file. if that is the case I'm not entirely sure why the following isn't working for me.
Code:
[root@LCENT01:~]#grep -i id_rsa.pub .ssh/authorized_keys
[root@LCENT01:~]#cat id_rsa.pub >> .ssh/authorized_keys
[root@LCENT01:~]#grep -i id_rsa.pub .ssh/authorized_keys
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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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Oct 20, 2009
how to do the listing of zip file contents using C?
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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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Apr 27, 2011
I agree deleting .Xauthority files work, but thats not a good solution. I mean, everytime I have to run any X forwarding application I have to delete the .Xauthority file. Here is my scenarioThe applications that I want to run are on Linux Server [NFS] and the client machines [CIFS] that are having problem in locking theXauthority files are Macs which share the same domain as that of client solaris machine. i.e. The home directory of particular user on Solaris & the home directory of that user on Mac have same contents.When I ssh -X from Solaris to the server, everything works fine, no error messages.When I ssh -X from MACs to the server, I get the following warning messages.
Code:
/usr/X/bin/xauth: error in locking authority file /home/user/.Xauthority
/usr/X/bin/xauth is the path on the server. If I try to break the lock by sudo
[code]....
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Mar 3, 2010
I even threw some video DVDs at it to make sure it wasn't the disc.
Code:
[pickens@acer1 Videos]$ dd if=/dev/sr0 of=POTC.iso
dd: reading `/dev/sr0': Input/output error
5088+0 records in
[code]....
I am getting the same thing on my laptop running Mandriva, oddly enough. Two different drives, two different computers, two different distros and multiple DVDs.
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Mar 3, 2010
I have an ISO CD image file and want to extract it's contents to a folder. I know there are ways to mount the image and stuff, but it's complicated. I'm looking for a GUI tool to open up the contets and extract needed files. On windows I would use WinRar to do this. K3B only allows me to burn the stuff, Arch does not work with ISO files :(Is there a similar tool on Linux, preferably from KDE world?
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Apr 20, 2010
I have a .bkf backup file, created by the Backup utility that Microsoft provides with Windows XP. Is there a way to read the contents of the file using a non-Microsoft OS, preferably Mac OS X or Linux?
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Nov 23, 2010
How do I make a .zip file that contains every file AND every folder in the directory?
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Jul 17, 2011
how do i edit the "contents" of a pdf file. I tried pdfedit but I cant find where the content table list is stored.
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Jul 1, 2011
As the topic title states, I would like to know the preferred way of viewing the contents of a Berkeley DB file. The machine the file is on is running SuSE 9.3, with perl 5.8.6 and php 5.2.0 installed. (I'm not sure if stating that was necessary, but my understanding is that the more information I can provide you, the better. The purpose to this question is this: I have been requested to look into coming up with some form of Geocoding software for one of my company's clients. Specifically, I've been requested to look into trying to obtain Census tract/block information.
I discovered the Perl module Geo::Coder::US, which uses Census input (TIGERLine files) to create a Berkeley DB file, then reads said file to produce its own output. However, the output from Geo::Coder::US only provides latitude and longitude information.At the moment, my only interest is in popping the Berkeley DB file generated with the import script packaged with the Geo::Coder::US module. I'm trying to see what the contents of that DB file are, so I can determine if the information I'm after is even in there in the first place.
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Oct 23, 2010
I am trying to upload an IOS in the cisco NAC Appliance. The IOS version has to be updated as 4.8. I am getting the below error when i tried. File is not in gzip format Child return status 1 Error exit delayed from previous errors. I am using the below command to unzip the IOS file. tar xzvf ccca_upgrade-4.8.0-from-4.6.x.tar.gz.
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Feb 23, 2010
shell command to display contents of a file? Like that of .txt or .html
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Nov 30, 2010
Is there a way to report the contents of the file cache held on RAM?
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Oct 30, 2010
I want to know if there is anyway I can extract the first few contents of a zipped file and then the next fixed and so on? For example, suppose I have a zipped file containing 1000000 natural numbers and I want to extract the first thousand numbers and then the next thousand numbers (1001-2000) and so on till I reach the end. Is this possible?
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