General :: Determine The Actual Command That Is Piping?

Feb 11, 2011

Let's say I have a bash script called In this script, I want to read in input from a pipe, but I also want to know the command used to pipe input into me. Example:

tail -f /var/log/httpd/error |

In the shell script, I want to know the command tail -f /var/log/httpd/error.

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General :: Details On Piping Information Into Command

Feb 15, 2011

I am sure this has been covered before, however I do not know which terms to sue for searching for this, so I will try and explain it.

I have a program that I run at startup to connect me to my work VPN, specifically the Cisco VPN client. When running the program, it prompts me for my username and password. I would like to be able to automate the login process by piping the username and password into the program everytime it starts up (username and password cannot be passed as arguments to the program)

Something like echo username | echo password | vpn_script

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General :: How Does Cp Command Determine Source And Destination Locations In Command?

Apr 14, 2011

When you run the following cp command in the BASH terminal, how does Linux know which files are the source and which are the destination when copying multiple files from one location to another?How does Linux know that the services, motd, fstab, and hosts files are the source and the /home/fred/my_dir is the destination?This question came up in a Linux class and I was not sure of the answer. I was thinking it is based on the source path entered ending with a file path and the destination being a directory, but was not sure.

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General :: What Command Run To Determine The IP Numbers?

Apr 20, 2011

Firstly I would like to say that Linux is very cool, especially the CLI. I have been trying to learn how to do some things in Fedora after being told Fedora was a good distro to get my feet wet. I have run into some issues and cant seem to find any answers. What Linux utility can be configured to automatically save the current logs?

How does your Fedora get an IP number? What IP numbers has your Fedora been assigned since it was installed (based on the logs you have)? What command did you run to determine the IP numbers? What command would you run to determine the number of times a user successfully used "su"? What command would you run to determine the number of times a user unsuccessfully used "su"? Having some issues with the file system as your Fedora boots up.

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Ubuntu :: Piping Command Output Into Grep As Search Term?

Nov 11, 2010

I want to pipe the output of a command into grep as the search TERM, rather than the text to be searched, like this for example


cat /var/log/auth.log | grep date "&b &d"

so that I only see the lines in auth.log for the current day...but obviously that line doesn't work.... is there a way to do this with grep, or even another command?

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General :: Command To Determine Where Domain Is Hosted?

Jun 13, 2010

Is there a linux/unix command that will return where a domain is hosted at? Basically, the command that is used for [URL]?

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General :: Command Line - Determine What File Occupies A Given Sector?

Apr 14, 2010

In Linux, I'd like to know how to find the file(s) if any which as using a particular sector on the hard drive (ext2/3). There is a similar question here regarding Windows, however I need a Linux command line solution (this is a headless system).

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General :: "shutdown" Command Allow A Parameter To Determine The Pause Between Sending SIGTERM And SIGKILL?

Jan 1, 2011

The man page seems to indicate no. There is /etc/rc.d/init.d/halt on Fedora. It has a hard coded pause in it, but there's got to be a better way than to change that script.

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General :: Piping Find To Rsyncrypto?

Aug 21, 2010

I am setting up rsyncrypto to create a backup of my user directory. I read that to exclude directories I need to exclude with find and pipe to rsyncrypto.

I am trying to exclude all .svn directories from getting encrypted and synced.

Here is the find command I'm using. I don't see any .svn directories in the output:

find ~/Documents -type d ( -name .svn ) -prune -o -print

But when I pipe the output to rsyncrypto I see lots of .svn directories getting encrypted.

find ~/Documents -type d ( -name .svn ) -prune -o -print | rsyncrypto -vc --trim=3 --filelist - /tmp/Documents/ Documents.keys backup.crt

rewrite the command to exclude from rsyncrypto any files/folders that have .svn in their path?

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General :: Piping Output Of List To Cp?

May 16, 2011

I have the following code


ls ~/ | grep ^[[:lower:]]

and would like to take the result of this output and use this as the basis for a cp command to move these files to another folder.

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General :: Redirecting Or Piping 'somecommand?

Oct 31, 2010

kernel 2.6, slackware 12.0mkisofs 2.01If I do 'ls --help|more' all's well. 'mkisofs --help' outputs its help screen, and I can use Shift+PgUp/PgDn to scroll through it. But I can neither pipe it to more or to less, nor redirect it to some file. more is simply ignored. Less, gets into less but only the last screenful is seen. Redirection, i.e. 'mkisofs --help>john.txt' produces an empty file (size= 0).

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General :: Piping Video Device Over SSH Or Tcptunnel ?

Aug 11, 2011

I want to attach an analog camera to an old linux computer and directly pipe the /dev/video0 to another computer, where I can use it as a device again (so /dev/video0 should go to /dev/remote0, for example)

(Reason for doing this is that the computer does not have enough power to encode the video)

Is that possible? I've seen people can pipe the data directly from the device over ssh into mplayer, but I need to have some sort of reference point for Zoneminder.

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General :: Piping Data To Multiple Outputs?

Mar 29, 2011

I remember there was a command that would allow me to pipe data to an app and the use the | operator to pipe it into yet another app.

foo fooArg | Iforget app1 | app2

I forget what this command is but it pipes the data from foo into app1 and app2.

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Debian Configuration :: Determine IP Address In Post-up Command?

Mar 22, 2010

Is there any elegant (and preferably uniform) way to determine IP address assigned to a DHCP/PPP interface inside a post-up command?

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Ubuntu Servers :: How To Determine Hardware From Command Line

Apr 5, 2011

I have a headless server set up with no GUI on board.I know there is some way to display the installed hardware , I just can't remember how.What I'm looking for in particular is determine the type and speed of the PCI-e slots.

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CentOS 5 :: Determine What Host Name An IP Is Connecting To From Command Line?

Jun 8, 2011

Is there any command which could help me to determine which host name (domain name) an IP is connecting to from the command line?

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Debian :: Determine File Type On Bash - Command Not Found

May 10, 2015

I cannot find a bash command: "file" !

It say "-bash: file: command not found"

"file" is used to determine file type on a bash right ? is there a package i have to install ? deprecated ?

I use debian wheezy distro

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Ubuntu :: Command To Determine Memory Usage On Hard Drive?

Jan 8, 2010

When at the console, what is the command (if there is one) to determine memory usage (used/free) on the hard drive that is being used for one's OS?

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General :: Actual File Size On Mac Os X?

Jan 27, 2010

I have a large number of folders that each contain quite a few files of varying sizes (from a few bytes to 400kb or so), mostly smaller ones. I need to get the actual (not the disk usage) size of these folders. Is there any way to do this with a command like 'du'?

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General :: Find Actual Used Memory?

Jul 4, 2011

Im trying to find a way in redhat to see if there is a command that could tell me the actual used memory by the system. For example when i do the free command, i want to see the Used minus cached value. Is there a way linux can report the true used memory and not the cached/buffer etc? if there is not specific command for that, can someone tell me a bash script that could calculate used-cached ?

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General :: Redirect From A File Into An Actual For Loop?

Apr 11, 2011

I multi-boot several Linux distributions with an assortment of additional data partitions. I get frustrated whenever fsck is forced during boot. (It ONLY happens when I'm in a hurry don't you know...) So I wrote a script to automate forced fscking when I do have the time. (And/or while I'm doing something else in another workspace.

Because I multi-boot, I've learned that udev doesn't always assign the same device name to each drive for all distributions. I've had the same partition identified as hda5, sda5, & sdb5 by different distributions (without doing anything to affect the boot order) So my solution is to keep a list of partitions in a specific file on each distro with valid device names according to that distribution's udev process. Actually I'd use LABEL= instead but the labels don't show up in /etc/mtab, and I like to make sure a partition isn't mounted before I try to fsck it.

I can make this work in a for loop using cat. But I've seen so many things about NOT using cat that I wanted to rebuild my script. I can make this work with a redirect instead of cat via a while loop, But I "LIKE" old style for loops. But I can't seem to find a way to make a redirect work with one. I thought this might make a good first �� question. I'm also open to any other suggestions on better/alternative methods... Is it possible to redirect from a file into an actual for loop?

My script is as follows:


# FsckEm I script to force file system checking on unmounted ext2/ext3/ext4
# partitions in preselected list. FsckEm accepts no options. Partition


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General :: Delete The File And Its Actual Associated Data?

May 12, 2011

I'm confused about "hard link" feature. I've been learning from my UNIX Academy DVDs training that hard links to a file can be many and each of them is an effective filename for the associated data. So let assume that we have some very sensitive data in a file and we want it to be deleted and file has 20 links. I "delete" a file, but in fact I deleted only one "name" of it. My understanding from the training that data is still there until we delete the last associated hard link. But how can I find the names of all of them? If we have the names, they can be removed one by one. Or may be there's command that can trace all the "names" and remove them at once?

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General :: Any Way To Change Actual File Names Using Amarok?

Jan 9, 2010

I use amarok 2 and I have a lot of files that are titled "Track #.mp3", in Amarok I have changed them to see as the real songs but the actual files are still the same. Is there a way to change the actual file names using amarok to match the tags I have inside of amarok? The reason why I'd want to do this:

1. If my home folder becomes corrupt I don't have to redo 100's of songs (I have a backup but none the less
2. If I ever decide to use another program or if I'm in W7 using Windows Media Player classic it'd be nice to have it recognize the correct files without having to double up on the tag editing

If this isn't possible I'm going to wishlist it because I think it's functional and having a bunch of Track# files is a pain but impossible to get around when you have a lot of mix cd's.

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General :: Move A VB Installed OS To Actual Hard Drive?

Jan 2, 2010

I did a quick search but came up with nothing. I'll list things in point form to make it less confusing

-I'm running Ubuntu 9.10 with GRUB 1.97

-I have Windows 2000 installed on VirtualBox

-I have an NTFS partition with just music and my data on it, but no windows OS

-I want to take what I have on VirtualBox and put it on my NTFS partition

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General :: How To Create Disk Image Of Actual Data

Nov 15, 2010

Suppose I have a 80 GB hard disk (sda) with 4GB of contents. Using a dd to copy to a different disk

dd if=/dev/sda of=/dev/sdb
copies all the contents (including free space). So sdb also needs to be 80GB.

You will notice that in VMWare or VirtualBox disk images, it is possible to set the disk to use only the amount of space of actual data. So a 80GB virtualbox/vmware image with 4GB of contents will be 4GB.

Is it possible to do that with an actual hard disk (sda) image? I want to create an image of an actual hard disk, copy it to DVD and transport it (in mail) for restoration on another computer (having same hard disk).

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General :: Use The Actual Network Card Of Computer In The Simulator NS3?

Feb 23, 2011

i have a doubt about NS3, can use the actual network card of my computer in the simulator NS3, that is, if my network card can behave as programmed into the simulator.

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General :: Create An Actual Automatic Bootable Installation CD?

Oct 24, 2010

So since i deleted a necessary package my redhat system crashed. Now, when i had initially installed redhat using a friends disk I copied all the files from the CD-ROM on my external hard drive (of course after installing through the CD)

Now I need to re-install linux and I have no idea how to actually use those files to create an actual automatic bootable installation CD?

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General :: Get The Each Process Actual RAM Memory Usage In 2.6.21 Or Higher Version

Feb 8, 2010

I woukld like to know the kernel command or linux kernel file name where i can get the process actual physical RAM usage in linux version 2.6.21 or hiher version.

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Ubuntu :: Command To Determine Active User (Not $USER Variable)

Jul 21, 2010

I'm trying to write a small script that will run as root, but launch a command with sudo as another user. I want that user to be whichever user is active user. That is, the user that is using GDM right now, or the one that is logged into the current console. (by current console, I don't mean the user running the script, but rather the user logged into the console currently displayed on the screen.)How can this be done?


test `id -u pulse` -ge 1000 && sudo -u $ACTIVE_USER $*

What can I use for "somecommand"?

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Programming :: Procmail Piping To A PHP Script

Aug 6, 2010

I have my .procmailrc file set up to pipe mail to a simple php script I've written. The only thing the script does at this point is echo back a "hello" message. However, procmail does not execute the script properly.

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