/media/sda-magnetic/david/Dokumente-15/fernuni-hagen/cs-i-ii/old-cs-2-03/bash-programming/lex-yacc-bash-etc/all00022.txt

# client
# sender
# recipient
# relay

smtpd_client_restrictions=
smtpd_sender_restrictions=
smtpd_recipient_restrictions=
smtpd_relay_restrictions=
smtpd_data_restrictions=
smtpd_end_of_data_restrictions=
smtpd_helo_restrictions=
smtpd_etrn_restrictions=

mynetworks=
myhostname=
smtpd_helo_required=yes

# permit_mynetworks
# check_policy_service

# unknown
# reject_unknown_client
# reject_unknown_client_hostname
# reject_unknown_reverse_client_hostname
# reject_unknown_hostname
# reject_unknown_helo_hostname
# reject_unknown_sender_domain
# reject_unknown_recipient_domain 

# hostname 
# reject_unknown_client_hostname
# reject_unknown_reverse_client_hostname
# reject_unknown_hostname 
# reject_invalid_hostname 
# reject_non_fqdn_hostname 
# reject_unknown_helo_hostname

# non_fqdn 
# reject_non_fqdn_hostname
# reject_non_fqdn_sender
# reject_non_fqdn_recipient

# sender
# reject_non_fqdn_sender
# reject_unknown_sender_domain

# recipient
# reject_non_fqdn_recipient
# reject_unknown_recipient_domain

# unauth
# reject_unauth_pipelining
# reject_unauth_destination 

a CAPABILITY
a LOGIN "user" "password"
a LIST "" *
a SELECT INBOX
a FETCH 1 RFC822
a STORE 1 +FLAGS (\Seen \Deleted)
a CLOSE
a EXPUNGE
a SEARCH 
a LOGOUT

HELO/EHLO
MAIL
DATA 
RST
VRFY
EXPN
NOOP
QUIT

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%{
#include <stdio.h>
#include <ctype.h>
%)
%token NUMBER 
%%
lines           :       lines expr '\n'     {printf("%d\n", $2);}
                |       lines '\n'
                ;
expr            :       expr '+' term       {$$=$1+$3;}
                |       expr '-' term       {$$=$1-$3;}
                |       term
                ;
term            :       term '*' factor     {$$=$1*$3;}
                |       term '/' factor     {$$=$1/$3;}
                |       term
                ;
factor          :       '(' expr ')'        {$$=$2;}
                |       NUMBER
                ;
                
statement       ->      assignment | cond | loop
assignment      ->      id := expr
cond            ->      if boolexpr then statement fi |
                        if boolexpr then statement else statement fi
loop            ->      while boolexpr do statemend od
expr            ->      boolexpr | numexpr
boolexpr        ->      numexpr cop numexpr
numexpr         ->      numexpr + term | term
term            ->      term * factor | factor
factor          ->      id | const | (numexpr)

./skript.sh
/bin/bash ./skript.sh
bash skript.sh

#!/bin/bash 

# Die ist ein Kommentar
echo "Ausgabe"

var1=Hallo
var2=Welt

echo $var1
echo $var2

if [ $var1 == $var2 ]
then 
    echo $var1
else
    echo $var2
fi

while [ $var1 == $var2 ]
do
    echo $var1
done

for var3 in "a " "b " "c "
do
    echo $var3
done

typeset -i i=3
i=$(( 5 ))
i=$(( 4+5 ))

while [ $i -le 50 ]
do
    echo $i
    i=$(( $i+1 ))
done

useradd
userdel
usermod
newgrp
groupadd
groupdel
groupmod
passwd
id
chsh
chfn

cp
mv
mmv
cd
rm
rmdir
unlink
touch
cat
cut
mkdir

diff
comm

locatedb
update

dd
lsof
lsblk
blkid
mount/umount

pwd

man
info

rsync
rename
dirname
basname

shred
sort
split

uniq

Pipeline
Pipeline-Stufe = Pipeline-Segment
Pipeline-Register
Pipeline-Maschinentakt
Durchsatz einer Pipeline

1. IF = Instruction Fetch = Befehlsholestufe
2. ID = Instruction Decode = Befehlsdekodierstufe/Operandenbereitstellungstufe
3. EX = Execute/Adress Calculation = Ausführungsstufe
4. MEM = Memory Access = Speicherzugriffsphase
5. WB = Write Back = Resulutatspeicherphase

Befehl holen
Befehl dekodieren 
Operanden Bereitstellen
Operation in ALU
Resultat zurückschreiben 

Pipeline-Konflikte
Pipeline-Hemmnisse = Pipeline-Hazards

1. Datenkonflikte
2. Struktur- und Ressourcenkonflikte
3. Steuerflusskonflikte

Datenkonflikte
1. Echteabhängigkeit = RAW
2. Gegenabhängigkeit = Anti Dependency = WAR
3. Ausgabe = RAW

Behandlung durch Compiler
Erkennung durch Hardware - Pipeline Sperren Interlocking...

BTAC - Branch Adress Target Cache = Sprungzieladresscache
Branch Adress Cache
BTB - Branch Target Buffer

1. Predict always not taken
2. Predict always taken
3. Predict backward taken, forward not taken 

1. Ein-Bit-Prädiktor
- T - Taken 
- NT - Not Taken 

2. 2-Bit:
- Predict strongly taken
- Predict weakly taken 
- Predict weakly not taken 
- Predict strongly not taken