http://wolfslittlestore.be/2013/01/looking-for-shell-programming-expert/

tijdregistratie.sh

#!/bin/bash

if [ ! -f "$1" ]; then
    echo "Usage: $0 filename.txt"
    exit -1
fi

filename=$1
months="Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec"
linenr=0
totalhours=0

echo -e '# Tijdsregistratie\n'

while read line; do
    # skip blank lines
    [ -z "$line" ] && continue

    (( linenr++ ))

    # save fist line
    if [ `expr $linenr % 2` != 0 ]; then
        line1=$line
        continue
    fi

    # print on second line
    string="${months%`echo $line | cut -d' ' -f3`*}"
    day=`echo $line | cut -d' ' -f2`
    month=`echo "$((${#string}/4 + 1))"`

    hours=`echo $line1 | cut -d']' -f1 | sed 's/\[b//' | sed 's/h//'`
    job=`echo $line1 | cut -d']' -f2`

    hourspoint=`echo $hours | sed 's/,/./'`
    totalhours=`echo - | awk "{ print $totalhours+$hourspoint }"`

    printf "%.2d-%.2d\t%s\t%s\n" $day $month "$hours" "$job"
done < $filename

echo -e "\nTotaal\t$totalhours" | sed 's/\./,/'

Given your original file:

[tvl@orion ~/Desktop *]
$ cat dummy1.txt 
[b1,25h] Meeting initial briefing
scheduled 16 Oct 2012 from 08:00 to 12:00

[b1,5h] Voorstel Sample project
scheduled 17 Aug 2012 from 08:00 to 12:00

[b2h] Test designs Sample project
scheduled 21 Aug 2012 from 08:00 to 12:00

[b5h] Work @ Sample project
scheduled 24 Oct 2012 from 08:00 to 12:00

[b5,5h] Sample project html/css
scheduled 26 Oct 2012 from 08:00 to 12:00

[b5,75h] Sample project html/css
scheduled 29 Oct 2012 from 08:00 to 12:00

[b5h] Sample project html/css
scheduled 31 Oct 2012 from 08:00 to 12:00

[b1,25h] Sample project html/css
scheduled 1 Nov 2012 from 08:00 to 12:00

[b1,25h] Sample project html/css
scheduled 2 Nov 2012 from 08:00 to 12:00

[b0,25h] Sample project feedback
scheduled 30 Nov 2012 from 08:00 to 12:00

[b2h] Sample project vergadering
scheduled 4 Jan 2012 from 08:00 to 12:00

[b0,5h] org todos
scheduled 9 Jan 2012 from 08:00 to 12:00

[b3h] redesign homepage html/css
scheduled 16 Jan 2012 from 08:00 to 12:00

[b4h] Sample project e-mail template
scheduled 18 Jan 2012 from 08:00 to 12:00

Results in correct output:

[tvl@orion ~/Desktop *]
$ ./tijdregistratie.sh dummy1.txt 
# Tijdsregistratie

16-10   1,25    Meeting initial briefing
17-08   1,5     Voorstel Sample project
21-08   2       Test designs Sample project
24-10   5       Work @ Sample project
26-10   5,5     Sample project html/css
29-10   5,75    Sample project html/css
31-10   5       Sample project html/css
01-11   1,25    Sample project html/css
02-11   1,25    Sample project html/css
30-11   0,25    Sample project feedback
04-01   2       Sample project vergadering
09-01   0,5     org todos
16-01   3       redesign homepage html/css
18-01   4       Sample project e-mail template

Totaal  38,25

That's a great script.

I hope you used OCR on the screenshots to get the original text :)

I have some extra additions to the original question so if you are interested in a small job let me know.

Sure. Stuur maar een mailtje.

Enkele ongevraagde opmerkingen/tips:

• exit -1 is hetzelfde als exit 255 door de overflow, maar minder expliciet. Overweeg eventueel ook exit 2 ("No such file or directory".)
• Bash ondersteunt arrays. Netter dan die stringmanipulatie: months=(Jan Feb Mar…)
• Verkies echo $'foo' bovenecho -e 'foo'. Dat is POSIX en wordt door meer omgevingen ondersteund. Werkt overigens niet alleen met echo. Test: touch $'This is a file name\nwith two lines'.
• Gebruik read -r om ongewenste "unescaping" te vermijden. Anders wordt C:\news in de invoer omgezet naar een "C:(nieuwe regel)ews", bijvoorbeeld.
• "fist line"? ;-)
• Die expr is niet nodig. Je gebruikt al ((linenr++)). Met die dubbele haakjes kan je allerlei wiskundige bewerkingen doen.

Sorry. Ik ben zó iemand.