Algorithms, Design, Code and more: Unix

Showing posts with label Unix. Show all posts

Thursday, June 3, 2021

Installing Canon LBP2900 Printer on Ubuntu 20.04

The instructions for installing Canon LBP2900 Printer on Ubuntu 20.04 remain pretty much the same as given in an earlier post about Installing Canon LBP2900 Printer on Ubuntu 16.04. The few differences seen this time around are the following:

1) Newer version of LINUX-CAPT-DRV-v271-UKEN: Download link as mentioned on the Canon Support page.

The tar ball includes 64-bit installers: cndrvcups-common_3.21-1_amd64.deb & cndrvcups-capt_2.71-1_amd64.deb (also includes rpm files & 32-bit versions).

2) Depdency on libglade2-0:

$ sudo apt-get install libglade2-0

3) Workaround for CAPT 64-bit OS issues linking to 32-bit libraries:

As mentioned in the earlier post, there are certain dependencies for CAPT running in 64-bit OS in linking to 32-bit libraries. Even though, the two deb files (mentioned above) get installed without the dependencies, peculiar behaviour/ error message is seen when the dependecies are missing. On the final step to View Status of printer on captstatusui, an error message is shown: "Check the DevicePath of /etc/ccpd.conf".

The solution to the problem is to simply check the missing dependencies:
(Check for error messages such as not executable, not found, etc.)

$ ldd /usr/bin/captfilter

$ ldd /usr/bin/capt* | sort | uniq | grep "not found"

In case of error install the missing dependencies:

$ sudo apt-get install libc6:i386 libpopt0:i386

$ sudo apt-get install zlib1g:i386 libxml2:i386 libstdc++6:i386

4) Follow the remaining instructions of the earlier post:

=> Install CAPT printer driver (downloaded .deb files mentioned above)

=> Add printer to the system: (Command line lpadmin or system-config-printer or UI System Settings > Printers):

=> Add printer to ccpadmin

=> View status of printer on captstatusui (should show "Ready to Print" if installed correctly)

=> Finally, print test page to finish!

Monday, August 26, 2019

Dconf, Gsettings, Gnome Files/ Nautilus Refresher

Dconf is the Linux key-based configuration system that provides the back end to Gsettings to store configurations. Dconf settings can be updated via dconf-editor and/ or via the gsettings command line. Gnome Files/ Nautilus settings for instance is Dconf based & can be accessed/ updated with these tools.

Friday, January 5, 2018

Installing Canon LBP2900 Printer on Ubuntu 16.04

Capturing notes on installation of Canon LBP2900 printer on a 64-bit Ubuntu 16.04 (a first for this version) locally (usb). These are essentially a mix and match of instructions from the pages Canon CAPT Driver, installing canon printer on debian systems, & Canon CAPT driver in a sequence that works.

=> Pre-requisites:

- Cups installation:

(Note: These instructions are from the alternate open source foo2capt library library. I have retained the installs for now, did not apt-remove. Not sure if all of them are actually needed.

As such, the foo2capt code failed to build & install with a whole lot of other missing/ invalid dependency issues. The foo2capt project rewrite seems to be on, so for now dropped the idea of experimenting with it any further.)

- Work around to known CAPT 64-bit OS issues linking to 32-bit libraries:

=> Download & install the Linux CAPT printer driver:

Download Linux_CAPT_PrinterDriver_V260_uk_EN.tar.gz, also linked here.

- Untar & install the 64-bit > Debian packages:

=> Add printer to system:

- Start/ Restart cups service:

- Can be done via the command line using lpadmin:

- Alternatively can be done via System Settings > Printer:

Either type on terminal:

Or via System Tools > System Settings & Search for Printer

At this point a new printer gets created in my system with the name "Canon-LBP2900-CAPT-English".

(NOTE: Important to use the port 59787 (and not 59687). Also note that in the /etc/ccpd.conf, port 59787 is mentioned as UI_Port (& used by the captstatusui to communicate), while port 59687 as PDATA_Port files. Once ccpd services have been started, you can telnet to check that these ports are listening. )

=> Add printer to ccpadmin:

- Add "Canon-LBP2900-CAPT-English" to ccpadmin: (will override any existing/ old entry)

- Now there should be a proper entry corresponding to the printer "Canon-LBP2900-CAPT-English":

=> Restart ccpd services:

The ccpd services need to be restarted since they don't start up automatically, there could also be the one ccpd process issue.

=> View status of printer on captstatusui:

- In case you see a communication error, unplug your printer & plug it in again. On my system this works & the printer status changes to:
"Ready to Print"

(Note: Steps for setting up capt rules for usb add/remove could also be tried out.)

=> Print test page:

Next print a test page on "Canon-LBP2900-CAPT-English" & that's it for the set-up.

Friday, May 3, 2013

Php Script To Display Process, Vmstat, Disk Usage, Syslog Of A Linux Server Via A Browser

A Php script that executes some standard shell programs for monitoring resource utilization & processes on a given Linux box. The script directs the output to a web-browser.

Apache web-server should be installed on the server. To run copy the script to the DocumentRoot (/var/www/html). Appropriate execute rights (-rw-x) need to be given to the apache user (which runs this script, but is not the owner) to execute this Php file & to be able to access /var/log/syslog.

Save this file as: showHealth.php in the /var/www/html folder:

<html>
<body>
<script type="text/javascript">

</script>
<div id="outermost">
<div id="mcdetails">
Showing stats from:

<?php
echo shell_exec("ip addr show | grep 'inet' | tail -1");
?>
<br/><br/>Server Date is:
<?php
echo shell_exec("date");
?>
<br/><br/>
</div>
<a href="#" onclick="toggle('vmstat');">-------Vmstat----------</a><br/><br/>
<div id="vmstat" style="display:none">
<?php
$output = shell_exec("vmstat| sed 's/$/<br\/>/g'| sed 's/ /./g'");
echo $output;
?>
</div>
<br/><a href="#" onclick="toggle('df');">-------df -m----------</a><br/><br/>
<div id="df" style="display:none">
<?php
$output = shell_exec("df -m | sed 's/$/<br\/>/g'| sed 's/ /./g'");
echo $output;
?>
</div>
<br/><a href="#" onclick="toggle('ps');">-------ps aux----------</a><br/><br/>
<div id="ps" style="display:none">
<?php
$output = shell_exec("ps aux | sed 's/$/<br\/><br\/>/g'| sed 's/ /./g'");
//$output = shell_exec('ls -l');
echo $output;
?>
</div>
<br/><a href="#" onclick="toggle('syslogdiv');">-------syslog----------</a><br/><br/>

<div id="syslogdiv" style="display:none">
<?php
$output = shell_exec("tail -200 /var/log/syslog | sed 's/$/<br\/>/g' ");
//$output = shell_exec('ls -l');
echo $output;
?>
</div>
</div>
</body>
</html>

Saturday, April 20, 2013

Linux/Unix Shell Function For Date Addition and Subtraction

Here is a small shell script to do date addition and subtraction. This works on the bash shell with GNU Date.

#!/bin/bash

function getPreviousDateTime(){
d1=`date -d "$1" +'%Y-%m-%d %H:%M:%S'`;
secs1=`date -d"$d1" +%s`;
secs2=`expr $secs1 - $2`;

# change to %H:%M:%S if you want the nos. left padded
result=`date -d@"$secs2" +'%Y-%m-%d %-H:%-M:%-S'`;
# return formatted string
echo $result;
}

function getNextDateTime(){
d1=`date -d "$1" +'%Y-%m-%d %H:%M:%S'`;
secs1=`date -d"$d1" +%s`;
secs2=`expr $secs1 + $2`;
result=`date -d@"$secs2" +'%Y-%m-%d %H:%M:%S'`;
# return formatted string
echo $result;
}

# Tests

echo `getPreviousDateTime "2012-04-29 18:00:31" 30`
echo `getPreviousDateTime "2012-04-29 00:00:00" 60`
echo `getPreviousDateTime "2012-04-29 02:00:00" 60`

echo `getNextDateTime "2012-04-29 19:00:00" 60`;
echo `getNextDateTime "2012-04-30 23:59:00" 60`;
echo `getNextDateTime "2012-02-28 23:59:00" 60`;
echo `getNextDateTime "2012-02-28 2:59:00" 60`;