A lap 2021. április 22., 05:26-kori változata

• Create a text file of any content with mcedit! The file name should be test.txt!

feri@aries:~$ mcedit test.txt

• Create a shell script that prints the following text: Hello world!

#!/bin/bash
echo "Hello world!"

• Create a program that assigns a value to variable named A and then shows its value.

#!/bin/bash
A=12
echo "A=$A"

• Create a program that asks for the user's name from the keyboard and greets him in person!

#!/bin/bash
echo -n "Your name: "
read NAME
echo "Nice to see you, $NAME"

• Create a program that prints the English abbreviation of today's name! The name of the current day can be obtained by properly parameterizing the date command. (Use the man page of the date command!)

#!/bin/bash
CURRENT_DATE=`date '+%a'`
# CURRENT_DATE=$(date '+%a') 
echo "The name of the day is: $CURRENT_DATE"

• Create a program that asks the length of the side of a square and then displays its perimeter and area. The name of the program should be square!

#!/bin/bash
echo "Perimeter and area"
# Ask the length
echo -n "Length of a side: "
read SIDE
# Count the perimeter and area
PER=`expr $SIDE \* 4`
AREA=`expr $SIDE \* $SIDE`
# Show the result
echo "The perimeter is $PER, area is $AREA of a $SIDE square."

• Create a program that takes its parameters from a configuration file! Read the variables named NAME and AGE from the params.conf file and print their values.

#!/bin/bash
. params.conf
echo "Name: $NAME, age: $AGE years."

Content of params.conf:
NAME="Kiss Lajos"
AGE=60

• Create a program that asks for a user's login name and looks up its full name in the / etc / passwd file! The name of the program should be usersearch.

#!/bin/bash
echo -n "Login név: "
read NEV
FULLNAME=`cat /etc/passwd | grep ^$NEV: | cut -d: -f5`
echo "Teljes név: $FULLNAME"