General :: Command To Overwrite File With Sed Output?

Jan 5, 2010

For example I want a file to be processed by sed, and then overwrite the file with sed's output. I would try this:
Code:
sed '<regex goes here>' myfile > myfile
But it doesn't work as expected, instead it empties the file (I am thinking that as the first byte comes out of sed, it overwrites the whole file and sed has nothing more to do). How can I make this work?

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General :: Append Command Output To File By Giving Command In Terminal?

Jul 3, 2009

I am using openSUSE 10.3.When I install software from tarball then to record time required I send output of date to beg.txt(when installation begins) and end.txt (when installation finishes).How can I append output of date to a file so I don't need two files?

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General :: How To Print Command Output To A File

Apr 29, 2010

I am creating a script to sync my important documents between two system. I want my script to generate a log file for the last action. can you suggest me a way to achieve this.Question: If I execute the rsync command with -v flag, it will print a lot of messages on the console. Is there any way. So, I can redirect these logs to a file?

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General :: Redirecting Command Output To File?

Sep 19, 2011

This seems so simple when doing it from command line but I'm not able to accomplish it inside a script. I am trying to put output of following command into a text file:

CMD= mysql -uroot -psecret -e 'SHOW SLAVE STATUS G;'
FIL=~/replication-`date +%F`.txt
MAILTEXT=~/mailtext.txt
touch $FIL
$CMD > $FIL

Where FIL is a variable that contains path of the file to which to output command. I am running this command in a shell script from where I want to email contents of $FIL as attachment using mutt. But I am always getting 0 byte file. Also if I examine in directory the file is of 0 byte length.

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General :: Meaning Of File Command Output?

Feb 27, 2010

I used the following command

Code:
file /usr/bin/mawk
Output is

[code]...

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General :: Command To Overwrite A Directory?

Jan 18, 2010

there's a command to overwrite a directory.

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General :: Store The Output Of Date And Watch Command To A File

Jun 15, 2011

I am trying to watch a command and try to log it into a file. I tried

watch -t -n 10 "(date '+TIME:%H:%M:%S'
; ps aux | grep "pattern" | wc -l)" >>
logfile

and am expecting a result like

TIME: 10:32:30 12
TIME: 10:32:40 18
TIME: 10:32:50 2

to be stored in logfile. However, when the logfile has unprintable characters in in. How do I get this kind of output from the command li

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General :: Output To A Text File, The Results Of Compound Command?

Jul 28, 2010

How to output to a text file the compound command:

Code:
find -type f -print0 | xargs -0 grep -l "desired text"
I have not been able to find the answer.

[code]...

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General :: Iperf Won't Export All Command Output To Text File?

Oct 18, 2010

I've created a script to test network speeds but I've run in to a little problem. The command outputs this:

Code:
Client connecting to 192.168.111.230, UDP port 5001
Sending 1470 byte datagrams

[code]...

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General :: Identify File System Type From The Output Of Fdisk Command?

Nov 16, 2010

The output of my fdisk command is as follows :-zodiac@gml-admin:~$ sudo fdisk -l[sudo] password for zodiac: Disk /dev/sda: 160.0 GB, 160041885696 bytes255 heads, 63sectors/track, 19457 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe30ce30c

Device Boot Start End Blocks Id System
/dev/sda1 * 1 1958 15727603+ 7 HPFS/NTFS
/dev/sda2 1959 4752 22437838 f W95 Ext'd (LBA)

[code]...

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General :: Redirect Output Of A Command To Another File Inside Shell Script?

Aug 26, 2010

I am writing a script in which I am using AWK to append to a line in a file and save the file. The command I am using is:

Code:
awk '{s=$0; if ( NR==4 ){s=s ":/usr/java/jdk1.6.0_19/bin" } print s;}' $appName > $appName.new

[code]...

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General :: Unzip Command: Option To Force Overwrite?

Jan 26, 2010

I am writing a shell script that unzips a ZIP file into an existing hierarchy of files, potentially overwriting some of the files. The problem is that the unzip command asks for confirmation: replace jsp/extension/add-aspect.jsp? [y]es, [n]o, [A]ll, [N]one, [r]ename: y

This is unacceptable for a script.I need an option to force unzip to overwrite the files.I did not find in the man page nor with Google.

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General :: Run A Command Per File From The Output Of "find" Command?

Sep 8, 2010

I want to scan a particular directory recursively and run a particular command with each file as input. For this I am using "find /dir/path". I dont want to write any long script containing loop on the output of "find". I want a single command which will allow me to run a command on each file of the "find" command output.

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General :: Why Use Patch Files Based Upon Different When Can Directly Overwrite The Old File With The New File

May 29, 2010

i want to know why do we need to patch files based upon diff when we can directly overwrite the old file with the new file.

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General :: Overwrite The Header Of A File Without Copying The Whole File?

Mar 1, 2011

Asuming I have two files, one large file and one small file, I want to write the smaller file to the large file without overwriting the remaining part of the larger file.

Both are binary files, and the large file can become very large, so I want to avoid copying the whole file, as that will take some time. Is there any standard Linux console utility to do this, or do I need to write it myself?

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General :: Why 'cannot Overwrite Existing File'

Mar 8, 2011

I try to write to a file "date > file" but Linux says 'cannot overwrite existing file'. I tried chmod 755 but still cannot write to the file. What should I do?

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General :: File Really Is After The Command 'file' Output "data"?

May 3, 2010

I download some movies those are with 'mkv' , but couldn't be played, I tried other players , like mplayer , dragon , xine, even swich OS to windows , didn't work . not all of those files , but some of them. one of them named 'the.other.man', 2GB.I opened a terminal and executed "file the.other.man.mkv "utput is "data", and command 'strings the.other.man.mkv", output like as follow:

T5}.
S!e
I|

[code]...

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Programming :: Bash Ambiguous Redirect - Redirect One Command Output Which Will Be Treat As A Content Of File For Another Command?

Mar 9, 2011

I am trying to grep multiple numbers from file, grep does have the -f option for that.

Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with

Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?

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General :: Send The Output Of Send Command To A File?

Jan 20, 2011

in the middle of script, i need to send the output of (send command on line 8) to a file

#!/usr/bin/expect
spawn telnet 172.20.64.133
expect "ENTER USERNAM <"

[cod]....

i treid the below on line 8 :

1- send "show command;

" > logfile.txt : gives an error extra character after the "

2- logsave logfile.txt 'send "show command;

" ': error invalid command

3- i simply tried to send the output of the whole script to file logsave /home/logfile ./script : seems that logsave work under root only

4- ./script > logfile : the problem with this is that the output of echo or (read "enter your id") command will not be displayed on the screen (actually nothing will be displayed, i have to open the log file to see the output). is there any way to save the log of the "send" ? or to save the log of the complete script without hiding the output on the screen?

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General :: Suppress "Do You Want To Overwrite" Prompt While Using Cp Command?

Feb 27, 2010

How to suppress "Do you want to overwrite" prompt while using cp command. I tried "cp -fr", but it isn't worked

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Fedora :: Command For Overwrite Menu.lst?

Mar 6, 2011

I've modified by mistake my menu.lst file. Both menu.lst and grub.conf are empty. how to fix this? Is there any command to quickly rewrite those files?

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General :: Redirecting Command Output To Input Of Another Command?

Jul 2, 2011

I want to run gsettings list-schemas (which return a list of about 100 names separated by spaces)and somehow direct each name one at a time as the input to this command:gsettings list-recursivelyI've tried it with awk, and standard | piping and also as a string variable strvar=$(gsettings list-schemas) and using the $strvar as the input butam missing something in between I'm sure like for - while or proper syntax of awk etc

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General :: Use Output Of Previous Command As Parameter To Another Command?

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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Software :: Overwrite The Contents Of A File Without Changing The File Size?

Jul 12, 2010

We have some large files with sampling data in it. Don't want to delete these files. But want to quickly overwrite the file with 0s and/or 1s and preserve the original file size.

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Ubuntu :: Log The Command Output's History That Are Previously Printed Messages In The Terminal To A File?

Apr 23, 2011

is it possible to log the command output's history that are previously printed messages in the terminal to a file? that is the first command output when i first opened terminal through the last command.

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Software :: Overwrite Same Input File Image

Mar 18, 2011

Code:
dd bs=8192 if=Image of=/dev/PS0
In the above command, I cant able to understand the option "of=/dev/PS0"

Whether it means,
1) to write the input file "Image" in to "/dev/PS0" of the Floppy device
or
2) to overwrite the same input file "Image" in a file format ("/dev/PS0") of Floppy.

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General :: Redirect Output From Dd Command?

Apr 7, 2010

How to redirect output from dd command to /dev/null ?

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General :: Copy Command Output In Vim?

Jul 25, 2010

For example, if I type ':pwd' to get the current working directory, I can select the text in gvim but I can't figure out how to copy it to the clipboard. If I try the same in console vim, I can't even select it with the mouse. I would like this to work with all vim commands, such as set guifont to copy the guifont=Consolas:h10:cANSI output.

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General :: Format The Output Of The Ps Command?

Aug 27, 2010

i am running ps xo "pid,command" but I can't find my process in the results. I know that the process is running because I run ps ax | grep command-name

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General :: Bash Command Output?

Feb 12, 2011

What does the following Shell program do ??: () { :| : &} ; :Warning: My computer got hung when i tried to execute this.Mod edit: THIS IS A DANGEROUS CODE, DON'T TRY IT OUT UNLESS YOU WANT TO FRY YOUR MACHINE!

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