Ubuntu :: Script - Grabbing Variables From Output
Jun 9, 2011
I want to be able to grab some text from a directory listing in a bash script, and then apply that text to future commands in the same script. For instance, say I do "ls -lais /media/Movies" and get:
2147560409 712544 -rwxr-x--- 1 root users 729645056 1999-03-07 11:45 Young Guns (1987).avi
2147560410 712400 -rwxr-x--- 1 root users 729497600 2002-01-09 01:11 Young Guns II (1990).avi
Then say I want to grab the year from this output and then use that information as part of the command to modify the file timestamp, such as:
touch "Young Guns (1987).avi" -t 198701011200
touch "Young Guns II (1990).avi" -t 199001011200
So that the result of ls -lais is:
2147560409 712544 -rwxr-x--- 1 root users 729645056 1987-01-01 12:00 Young Guns (1987).avi
2147560410 712400 -rwxr-x--- 1 root users 729497600 1990-01-01 12:00 Young Guns II (1990).avi
Anyway, that's just one example, but I often find myself needing to do this type of thing, and I'm sure its possible, just not really done enough scripting recently to know how to do it.
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Mar 24, 2011
Here's the scenario, rsync is running in RMT on tty2. I (LCL) am connected to RMT remotely as root over ssh. Is it possible to grab output of RMT's tty2 on my LCL? I don't want to redirect RMT's tty2 out to my pts, just get a mirror output.
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Mar 29, 2010
With my .conkyrc. Whenever I output the values of any of the mixer variables, eg. mixer, mixerbar, mixerl, mixerlbar, mixerr, mixerrbar - the correct value is initially displayed but it only persists for one iteration of conky. As soon as conky refreshes (2 secs. in my case), the value goes to zero (0). I'd have to restart conky in order to get another reading until conky loops/refreshes again.
I'm sure that it's not normal behavior because nothing else in conky seems to work this way. Has anyone come across this? I couldn't find a mention of it anywhere.
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Aug 2, 2010
I would like to run a bunch of SQL commands from mysql client in bash. However, I would like to store the output in different variables. E.g.
Code:
var1=`mysql -u[user] -p[pass] -D[dbname] -e "Query1"`
var2=`mysql -u[user] -p[pass] -D[dbname] -e "Query2"`
[code]...
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Jul 7, 2010
I have a problem with snmp answers being empty or having spaces.
What I already have:
#get all interface indexes (if you wonder - I'm working for a cable company and different cablemodems have different number and types of interfaces):
The problem is the physical address which is sometimes empty and the description which has spaces. So I'm doing 2 snmpgets which is slower than 1 snmpget (sometimes I have up to 18 interfaces).
I'm trying to explain it a bit simpler.
Interface 5 gives me back the following lines:
Ethernet CPE Interface
Now the first line should go into variable ifadm,
2nd line should go into variable ifoper,
3rd line should go into variable ifspeed,
4th line should go into variable iftype,
5th line (which is empty) should go into variable ifphys and finally
6th line (which has spaces) should go into variable ifdescr
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Apr 6, 2011
mkvmerge -o <filename without extension>_TV.mkv -S <filename> && mkvextract tracks <filename> 3:<filename without extension>.*** && perl /home/brian/Desktop/ass2srt.pl <filename without extension>.*** && rm <filename without extension>.***
Doing these commands for multiple command line file inputs is the goal. So I can just type ./script.sh *.mkv in my terminal.This is what I have so far, but it doesn't work whatsoever.
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Oct 3, 2010
is there any software for grabbing the videos even before it actually play back
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Aug 17, 2010
I've got a basic install (i.e., nothing fancy, no compwiz or whatever) of 10.4 (64 bit) on my computer, running gnome desktop. I find it very difficult to "grab" the edge of a window, when I want to resize it longer or wider and frequently I just wind up selecting the window below it when I try to drag it wider or longer. Is there a way to increase the border area in which that arrow-pointing-to-edge (as opposed to the usual cursor) appears to make it easier to grab the damn thing?
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May 12, 2010
I've got a short mp3 file from the BBC's League of Gentlemen comedy show. In the clip, Papa Lazarou tells his dwarfs to put a poster in the local shop. Then he says "Tell them the circus is coming to town."I'd like to grab that sentence "Tell them the circus is coming to town" so I can make it into a ringtone for my phone or something.
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May 20, 2010
What's the best command to use to grab just a regular expression from some text input? I've got is some input is in the form:
<uninteresting><start-marker><good stuff><end-marker><uninteresting>
I can construct a RE to match <start-marker>.*<end-marker>, but is there a utility that would return *just* the <good stuff> I'm interested in? I realise that the alternative is something along the lines of:
Code:
cat <input-file> | awk -F'start-marker' 'print ${2}' | awk -F'end-marker' 'print ${1}'
but it would be better if I could do it all in one go.
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Aug 2, 2010
I would like to grab wiki code from a wiki page using wget. Running this grabs HTML:
wget -O wikihtml.html [URL]
The first attempt at getting wiki code was to pretend to edit, and run:
wget -O wikiedit.html [URL]
but of course that grabs GUI HTML. I thought perhaps the text inside the text box would be in tact, but HTML is througout. How to get just the raw wiki code?
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Apr 9, 2010
I'd like to write a C/C++ program, that would grab content of window (in form of pixmap), which belongs to another application and do something with it. However, I ran into problems already at the beginning. In all toolkits I have searched through, I only found one function that claims to do what I want, namely XGetImage from Xlib. However, among other parameters like Display, coordinates, etc., it requires a Drawable. How do I specify a Drawable, that would correspond to the window I want to grab content of? Is there any easier way to achieve this?
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Jun 28, 2009
I want to display an un-intrusive graphical dialog to notify the workstation user that a bash script has finished running. It should be "top level", so visible to the user when it appears but should not grab focus, so the user can continue working in the current window and dismiss the notification when convenient. Researching gdialog, xdialog, xmessage and zenity it seems none of them can do this; they all grab focus.
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Apr 29, 2010
I cant seem to get the sound working and when I click on perference then sounds and go to the output selection it has only dummy output as a option.
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Mar 7, 2010
I installed KMplayer but I cant play video files...No video output but can get only the audio output...So how to make this work for videos?
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Jan 25, 2011
Running 10.10 and win 7 on my HP dv6-2150us laptop and I'm having a few issues.
First how do I get HDMI audio output to my TV? I think I have just a integrated Intel graphics card. It works fine in windows but I can't seem to get it to work in Ubuntu. I tried searching but couldn't find anything pertaining to this issue.
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Jan 6, 2011
I am sure that this is very simple but I have installed sound juicer and the gstreamer plug ins. The problem is i still cannot select MP3 as an output output option
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Jul 19, 2011
I don't know anything about ubuntu. Could you guys help me out. I'm pretty knowledgeable with windows if you guys need a printout of something let me know. My friends getting really frustrated about this. Help!!i
So here's the situation. He plugs his audio jack into his computer and then into the speakers but it still plays from the computer speakers.
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Mar 27, 2010
I finally got audio working on my ubuntu 9.10 desktop... now I am having sound issues watching movies from a network share.The sound device continually randomly changes to "dummy output device" and then there is no sound output. The sound icon dissapears on the toolbar. To get it back and audio to start working I have to $sudo alsa force-reloadIt seems to happen everytime there is a network delay, the movie will stop for a second and then when it plays the sound is gone
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Mar 4, 2011
Is possible to have two identical sound card outputs? For example, is I want to use two headphones at the same time.
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Aug 27, 2010
I'm have been tasked with created a base Ubuntu image that can be used for cloning to multiple machines. As this is a network environment, each hostname will obviously need to be unique. Rather than manually changing the hostname each time a new, cloned machine is rolled out, I was wondering if there is a way to use a variable in the hostname (i.e., use a variable to truncate the the last 6 digits of the MAC address to the end of the static hostname--or any other unique variable for that matter--so it would look like hostname00E6D4).
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Nov 2, 2010
I have a list of names (testnames.txt) and I have a set of log files (testlogdata.log). I'm trying to search the column in my log file for each of the names in my testnames.txt file, and output the result to individual files, name1.txt, name2.txt, name3.txt, etc the names in the column of my log file can appear in different formats , ie the name "Tom Smith" can appear as "tom_smith", "tom-smith", "ACME/tom.smith", "ACME/thomas.smith". etc. To allow for the variations, I have my names in the testnames.txt as expressions, ie, for tom smith, I use the expression "to.*smith", etc.I'm running the following command:
for i in $(cat testnames.txt); do awk '{if ($9~/$i/) print $0}' testlogdata.log > $ioutput.log; done
I want the command to read a value for i, insert it into the if ($9~/inserted value for i/, and dump each line from testlogdata.log into a file named <value-for-i>output.log.
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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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Mar 24, 2010
I am trying to use bash 'printf' to format an environment variable.Doing this I get on the screen just the format I need (underscores mean blank spaces):prompt> printf "%10s" "1.23"________1.23Unfortunately, when this is assigned to a variable, the format disappears:prompt> X=`printf "%10s" "1.23"`prompt> echo $X1.23Does anyone know what can be done in this case to get a proper format?Why does not 'printf' respect the left blank spaces when assigning values to a variable?
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Jun 20, 2011
I have what I hope is a fairly simple question to answer. In my ~/.bashrc file I can create this alias:
Code:
alias uChmodDP='chmod -R $1 $2' #specify permissions. and the variables work fine. But I cannot seem to get any love from this alias:
Code:
alias umnt='umount /dev/$1' I realize the likely problem is the variable following hot on the heels of a specific directory, but is there anyway to specify a variable in an alias like this? For some reason I cannot umount usb pen drives by right clicking, and have to always resort to the terminal to do so, which for me is no real biggie, but if I could create this alias it would be an even better no biggie to umount using the terminal.
Actually, the inability to right click to umount usb devices seems to be a Thunar issue since I run xubuntu. Using Nautilus I am able to right click and eject/safely remove devices. Using Thunar however, right click unmount always pukes back an error that the device must have been mounted on the command line or some such BS. But like I said it is no real biggie to use terminal, but an alias would be even nicer. I prefer using Thunar and Xubu most of the time b/c my laptop is quite underpowered.
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Jun 2, 2010
I know many people have asked about environment variables before, but I am having a hard time dealing with these paths while ensuring I don't mess around with the original settings. How would you go about executing these commands in Ubuntu in terms of environment variables?
put /home/stanley/Downloads/ns-allinone-2.34/bin:/home/stanley/Downloads ns-allinone-2.34/tcl8.4.18/unix:/home/stanley/Downloads/ns-allinone-2.34/tk8.4.18/unixinto your PATH environment; so that you'll be able to run itm/tclsh wish/xgraph.
IMPORTANT NOTICES:
(1) You MUST put
/home/stanley/Downloads/ns-allinone-2.34/otcl-1.13,
/home/stanley/Downloads/ns-allinone-2.34/lib,
into your LD_LIBRARY_PATH environment variable.
[Code]....
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Feb 12, 2010
In terminal, I use the command " export XXX="xxx" " to create a new environment variable, and then " env | grep XXX " to check if it is existed. But when I run the terminal again, the variable I created is disappeared. I've found it just can't save the variables I created..
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Mar 15, 2010
I can't seem to find how to export a variable to all processes I run under my user? I have an application that needs this variable, and currently I have to manually export this variable (typing "export VAR=... in terminal) every time before I run the application.
Which profile file I have to put the export expression into? I want all processes to inherit this variable, not just the shell/terminal. I.e. a true environment variable...
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Apr 7, 2010
I've created a new environment variable and updated another one (PATH). I just want to save this changes once after reboot and forever. This is because I want to run a program (tecplot) just typing 'tec360' in the command line. If I create those new variable ( TEC_360_2008=/usr/tec360_2008 ) and update the PATH variable ( export PATH=$PATH:$TEC_360_2008/bin ) then bash detect the command 'tec360' and it runs my program. The problem is that this changes are not saved after rebooting.
According to the manual, I have to update the .bash_profile in my home directory but I don't have this file in this directory (neither in other directory). I only have .bash_history, .bash_logout and .bashrc in the home directory. I have updated .bashrc (typing . ./.bashrc) but it is not working.
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May 13, 2010
I need to set some custom environment variables.
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