Bash Programming Examples

read timing-tests

bash

#!/bin/bash

echo "read und awk:"

time (
    while read ZEILE; do
	    BENUTZERNAME=$(echo $ZEILE | awk -F : '{print $1}')
	    HOMEDIR=$(echo $ZEILE | awk -F : '{print $6}')
	    echo "$BENUTZERNAME -> $HOMEDIR" > /dev/null
    done < /etc/passwd
) 2>&1

echo 
echo "read und cut:"

time (
    while read ZEILE; do
        BENUTZERNAME=$(echo $ZEILE | cut -d : -f 1)
        HOMEDIR=$(echo $ZEILE | cut -d : -f 6)
        echo "$BENUTZERNAME -> $HOMEDIR" > /dev/null
    done < /etc/passwd
) 2>&1

echo 
echo "read und String-Operationen:"
echo

time (
    while read ZEILE; do
        BENUTZERNAME=${ZEILE%%:*}
        TMP=${ZEILE%:*}
        HOMEDIR=${TMP##*:}
        echo "$BENUTZERNAME -> $HOMEDIR" > /dev/null
    done < /etc/passwd
) 2>&1

echo 
echo "read und IFS:"
echo

time (
    while IFS=: read BENUTZERNAME A B C D HOMEDIR E; do
        echo "$BENUTZERNAME -> $HOMEDIR" > /dev/null
    done < /etc/passwd
) 2>&1

Beispiel read und IFS

bash

#!/bin/bash

while IFS=: read BENUTZERNAME A B C D HOMEDIR E; do
    echo "$BENUTZERNAME -> $HOMEDIR"
done < /etc/passwd

codefode

bash

read -p "Enter your name : " name
echo $name

newscript

bash

#!/bin/bash
#This is a special text file
clear
read the_line
There
are 20 students in the class.
[TAB][SPACE] Nearly
half of them are enrolled in FoS. The rest are in
Faculty-Of-ES.
The output from the script should look like
There
[TAB][SPACE] Nearly
Faculty-Of-ES.
while read the_line; do
	((i++%2)) && { echo "$the_line";}
done < "$1"
exit 0

Execute Bash Shell Online

bash

#!/bin/bash
count=`awk '{print NF}' exam2.txt`
min=`awk '{print $1}' exam2.txt`
for((i=1;i<=$count;i++))
n=`awk '{print $'$i'}' exam2.txt`
	if((n< min))
		$min=$n
done
echo "Minimum no. is "$min

Venkat_project

bash

pwd

#!/bin/bash echo "informe o primeiro número" read n1 echo "informe o segundo número" read n2 echo "informe o terceiro número" read n3 echo "qual o decremento ?" read dec

bash

# Hello World Program in Bash Shell
#!/bin/bash
echo "informe o primeiro número"
read n1
echo "informe o segundo número"
read n2
echo "informe o terceiro número"
read n3
echo "qual o decremento ?"
read dec

emptiness

bash

# Hello World Program in Bash Shell

echo "Hello World!" > hello.txt
cat hello.txt

epr

bash

# Hello World Program in Bash Shell

echo "Hello World!"
echo "cart000 user000 1-1-2010 cycle000 cycle001 cycle003 2-1-2010"

abcd

bash

# Hello World Program in Bash Shell

echo "Hello World!"

date

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