Svītru kodi komandrindas režīmā

Ģenerājam PS failu ar svītru kodiem, kas atrodas failā kodi.txt.
barcode -i kodi.txt -e code39 -o mee.ps -t 7x18+5+18-5-10 -u mm

How to create PDF photo album with ImageMagick

rinda=""; a=1 ; p=1 ; 
for fails in ./*JPG  
  do 
   rinda=$rinda" "$fails[200x150]  
   a=$(($a+1))  
      if [ $a == 37 ] 
      then
        echo "processing $p set"  
        montage -label '%f' -tile 6x  $rinda  -page A4 index-$p.pdf 
        a=1 ; p=$(($p+1)) ; rinda=""  
      fi  
   done 
echo "processing last set"
montage -label '%f'  $rinda  -page A4 index-$p.pdf

Update
OMG. The following simple line just works and puts all thumbnails in one PDF file - 35 frames per PDF page.

montage -label "%f" -tile 5x7 -page A4 ../*JPG[200x150] index.pdf

DHCP kļūda pie LTSP instalēšanas

Vasarā lēnām migrējam serverus uz jaunām versijām un virtuālām mašīnām.
Pēc DHCP servera pārcelšanas no Debian Etch uz Debian Squeeze vairs nestartējās LTSP mašīnas - LTSP Etherboot saņem gan IP adresi gan PXE, bet tālāk turpinot ielādi - apstājas.

Ar Wireshark tika noskaidrots, ka "vainīgais" ir atkārtots DHCP pieprasījums no LTSP klienta. Ja DHCPD3 uz Etch deva atpakaļ pieprasītos datus, tad DHCPD3 (isc-dhcp-server 4.1.1-P1-15+squeeze2) atmeta šādu atbildi:

...
Unexpected hash function at hash.c:53.
DHCPDISCOVER from 08:00:27:36:2e:d3 via eth0
DHCPOFFER on 10.0.3.41 to 08:00:27:36:2e:d3 via eth0
DHCPREQUEST for 10.0.3.41 (10.0.0.1) from 08:00:27:36:2e:d3 via eth0: lease 10.0.3.41 unavailable.
DHCPNAK on 10.0.3.41 to 08:00:27:36:2e:d3 via eth0
...

Risinājums tika atrasts te: http://www.nubae.com/logs/ltsp20110317_pg2.html

Jeb, failam /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default galā ir jāpieraksta "IPAPPEND 3" un tā saturs ir šāds:

default ltsp
label ltsp
kernel vmlinuz
append ro initrd=initrd.img quiet splash nbdport=2000
IPAPPEND 3

Total traffic counter from MRTG log files

Script to count total traffic for last day for switch port from MRTG log files, and output file name, if total traffic is more than 10GB.

# period
sakums=`date -d -1day +%s`
# 1GB
ttrafic=$((1024*1024*1024))

pushd /var/www/mrtg
for fails in `find *log -mtime -1`
do tail -n +4 $fails | 
 awk -vsakums=$sakums -vfails=$fails   -vttrafic=$ttrafic '{ if ($1 > sakums)  
    {intr += ($2*300); outtr += ($3*300) }} 
    END   { if (outtr > 10000000000) 
    printf("%s\t%10.2f\t%10.2f\n",fails,intr/ttrafic,outtr/ttrafic) }'
done