How would I create a sed or awk command that would add a | to the end of a line if it wasn't already there? I'm trying to import some files into mysql, but some of the lines to not end with a | which is my field delmiter.
View 14 RepliesMy question deals with me creating a name pipe (file) in the my /group directory called chat.I then have to write a script to read from the named pipe and save data into a file called chat.log until the words End of File are passed to the program.
-When I created the named pipe file (chat) I used the mknod chat p command..Is this the correct command to create a named pipe file? -Then I'm having trouble with my script and how to make it run until the words End of File are entered in. This is what I have so far.
I'm trying to create a separate thread for my program which basically polls using the read command. However this new thread seems to block the main thread, anyone know why this could happen.
In main I call this function pthread_create(&mainEventThread, NULL, GenericEventThread, NULL);
which calls
/*New threads start function */
void *GenericEventThread()
{
short int i, nError = -1;
[Code]...
I've used pthread_self to check that a new thread is being created, so why is the while loop in one thread blocking the main thread from running, I haven't used the join function anywhere in my code.
Code: cmd='date | wc'
$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?
I am trying to learn how to pass more than a one-command startup for gnome-terminal.
I will give an example of what I'm trying to do here:
Code:
#! /bin/bash
#
#TODO write this for gnome and xterm
USAGE="
${0##*/} [-x] [-g]
code....
However, running with the -g option to invoke gnome-terminal, I get a "There was an error creating the child process for this terminal" error.
This same error occurs if the gnome-terminal line is changed to
Code:
gnome-terminal -e mcTerm
Is there any way to pass more than one command on to gnome-terminal? I have tried various single and double quoting senarios and in a final attempt, I abstracted to an exported function all to no avail. Perhaps even though gnome-term is better at many things than xterm, xterm trumps it in this instance.
I am writing a perl script which uses the matlab compiler to compile a .m file.
I am using the system("mcc �m file.m"). I have matlab installed and both script and exe are in the same drive.But i get the following error .
'mcc' is not a recognised as an internal or external command ,operable in program or batch file.
I am using gtk to program GUI. How can I show the output of shell command into a textbox, ex ps -efc command ?
View 3 Replies View RelatedI'm trying to convert this awk command from command line into an awk script, but just cannot get it to work:
This is what i have after my BEGIN
Am i missing something here? this just prints out the count for everyline, not counting lines on 5th field that match 'A'
suppose i store the history number of a command say :
1004 cat file
Then now i want to run it like : !1004 but by using a variable.
command=1004
!$command
i am getting errors like :
command=1004command
The program should work like finger command in an normal ubuntu OS.(which prints the user information)
View 2 Replies View RelatedI would like to create the shell which would support the LS command in C++. And any way to change the command prompt.
View 1 Replies View RelatedI have been following the Xen Beginners Guide here: [URL] .....
Everything was going smoothly until I got to the 'Configuring xen-tools and building our guest' section (two thirds down the page).
I installed xen-tools and then typed the following in a terminal window (as root):
xen-create-image --hostname=development-pv-guest --memory=2048mb --vcpus=2 --lvm=develop --dhcp --pygrub --dist=jessie
I admit PV is new to me, compared to simple HVM, so I have a number of questions:
1. Why the command not found error?
2. Should I be booting from the Xen option or regular boot option at the start up screen when creating the xen image? I've tried both and get the same error message.
3. I have Debian 8 (Jessie) installed on my system and I wasn't sure whether I should therefore make this the guest OS in my Xen PV. In asking this question I'm thinking in terms of HVMs - but I assume my Xen PV needs a guest OS of some kind? Or is my host Debian 8 already acting as a guest OS in Xen PV? I'm confused
4. If I do need to install a guest OS, is it better to go for an earlier version of debian - so as not to be so resource hungry?
I'm nervous about screwing up my host debian installation, so when I got the error message, did some research but found nothing meaningful. I don't want to end up having to reinstall my Debian 8 (base OS) ... again!
I am implementing a strategy to organize my data among the several machines I work with and thought that getting some ISO images out of it could be a good idea because that way data would be 'read only' thus allowing for easier synchronization.
At first I thought of using the "dd" command to create the ISO out of a directory, but it fails code...
So, I have two questions:
Is the ISO 'format' capable of storing complex directory structures with long filenames (pretty much as any Linux filesystem does), or are there some inherent limitations?
Supposing the ISO format is not constrained, which command would allow me to create an ISO file out of a directory?
I'm developing in java.
I want to create a GUI interface for some command line commands (drush - drupal).
How can I interact with the command line commands with java? or any other languege?
How can I create multipart rar file in Linux using the official console rar client?RAR 3.90 Copyright (c) 1993-2009 Alexander Roshal 16 Aug 2009Shareware version Type RAR -? for helpI want a multipart rar with each part size being 150 MB.
View 1 Replies View RelatedHow to split a tar file into smaller parts at file boundaries?
How can I create a multipart tar file in Linux?
I want to create one user without password using useradd command. Is there any way we can do the same? I have googled it but couldn't get the perfect solution
View 1 Replies View RelatedIs there a way to create a windowed message from the command line? Like an alert?
View 3 Replies View Relatedi have installed ubuntu, i cannot install make command, how to create a new world using make command?
View 1 Replies View Relatedi would like to create a script that calls a command with a flag....
/usr/bin/wget
calling
"curl -O"
[code]....
I want to create database from script directly by taking inputs USER, PASSWORD and DBNAME.code...
How to resolve this or any alternate method (other than entering into mysql prompt like mysql -u USER -pPASSWORD)?
i have a server running on centos5, i have run vsftp and samba, and i need create a user through command line and set your default directory, i can do this through graphic interface, but i need do throug line command.
View 12 Replies View RelatedI 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 ?
I launch a mdadm grow to expand my filesystem but I forget --backup-file.I have my server running and one UPS.
Code: Select allpk25.com:~# mdadm --manage /dev/md0 --add /dev/sde1
mdadm: added /dev/sde1
pk25.com:~# mdadm --grow --raid-devices=5 /dev/md0
mdadm: Need to backup 3072K of critical section..
pk25.com:~# mdadm --grow --raid-devices=5 --backup-file=/root/md0-grow.bak /dev/md0
mdadm: /dev/md0 is performing resync/recovery and cannot be reshaped
[code]....
how to create a missing /etc/X11/xorg.conf file.
I need to set certain parameters in xorg.conf, and my old xorg.conf won't work on my latest laptop.
I use putty to get to my RHEL 5.3 workstation from my Windows laptop.
Typically, if I want a new terminal on my windows 7 workstation from another terminal or mc, I have to type start and I will see a new terminal window running the default shell.
QUESTION : What is the equivalent command in RHEL 5.3 (and or solaris) to create a new terminal window from the command line ? I will be entering this command from the shell prompt or mc's command line.
In Windows, if I want to start another terminal and in that terminal, I want to run a program, I can do "start program.exe arg1 arg2". this will create a new terminal window and runs program.exe in that terminal window. I don't have to create a terminal and then in a separate step run the program. How can I do this in Linux ?
I use a few command line programs quite often such as nano and mpc. I'd like to create a shortcut icon to open them rather than opening a terminal and then typing in the program name to open it. For example, how could i open konsole with nano opened in one step?
View 5 Replies View RelatedHow can I create a multipart 7zip file in Linux using the p7zip console client? My console app is
7-Zip [64] 9.13 beta Copyright (c) 1999-2010 Igor Pavlov 2010-04-15
p7zip Version 9.13 (locale=C,Utf16=off,HugeFiles=on,4 CPUs)
I would like to create a command in the vim that saves a text document and also compile it. Is it possible?
View 4 Replies View RelatedI can do:mkdir messages and then: touch messages/hello.txt Is there a command that will do both - create the directory if it doesn't exist, and then the empty file? Something like: touch -p messages/hello.txt
View 1 Replies View Related