Homework & Coursework Questions

Hello i hope this post is ok! and i hope that i get the point of rules
i made this tasks by my self but few of them arent working.. and i dont know why!?
u think u could help me? to give me some reasons why dont they work.. and remake my code that will work?

hope to get answer soon!

greetz


1. Write a shell program which renames the current directory with the given file extension to another extension. The playoffs are given on the command line.

Example usage:

$ Rename *.txt to *.doc

will be renamed:

aaa.txt in aaa.doc
Juhutxt in Juhudoc
...

Code:

 i have done something like this..

#!/bin/bash

#program preimenuje koncnice datotek: naprimer .dat v .txt


for i in *$1; do 

    mv "$i" "${i%$1}$2";    ## "$1" je prvi "$2" pa drugi argument

done

exit

* To solve, you can also help with sed or awk commands.

*********************************************************

2. Write a shell program to check once every five minutes if the system appears a process and attempt to kill him. Name of the process we give the command line.

Example usage:

$ Kill firefox

computer will be checked every five minutes, if any process running called Firefox, and will try to kill him. Hint: Be sure to use the kill command.

Code:

 i have done something like this..

#!/bin/bash

while true
	do
ps -e | grep $1 ##ps -e "see every process on system using standard syntax:"--
	a=$?
if [ $a -eq 0 ];then
	kill `pidof $1`   ## kill proces with pidof, wich was added like arg1 
else
echo "this proces does not exsist"
	fi
	
	sleep 300
	
done

exit 1

fi

*********************************************************

3. Write a shell program, which checks the file / etc / passwd and displays the number of processes for each user.

Example output: Processes

45 root
peter 2
Exercise 8

* Look at solving the structure of the file / etc / passwd

Code:

 i have done something like this..

#!/bin/bash

for k in `cat /etc/passwd|cut -d: -f1` 
do
 echo "$k" `ps -U $k | wc -l`
 
done

exit

*********************************************************

4. 5.Write a shell program that records the daily availability of computers. As the argument we give him a file containing a list of computers, the program should check every five minutes if they are available. In a file (log) to record, if any of the computers are not reachable, the name and the time was not available.

Example usage:

$ Check list_of_computers.txt

prints in the book:

io.fri.uni-lj.si ni dosegljiv ob 15:31
io.fri.uni-lj.si ni dosegljiv ob 15:36
io.fri.uni-lj.si ni dosegljiv ob 15:41
verbena.fe.uni-lj.si ni dosegljiv ob 15:41
...

Code:

 i have done something like this..

#!/bin/bash	

while true do

  for rac in `cat $1` do	
  
    ping -c 3 $rac || echo "Ta racunalnik $i ob `date +%T` ni dosegljiv" >>dnevnik_nedosegljivih.txt (kamor se vpiše njegovo ime in čas, ko ni bil dosegljiv)
	
   done
   
 sleep 300 #(5min*60sec=300 sec)
 
done

exit 0

*********************************************************

5. Write a shell program, which scans all files in the specified directory and its poddirektorijih and displays the current file, (the date of last change).

Example output:

The latest $ / usr / etc
/ Usr / etc / httpd / httpd Oct 25 12:16

Code:

 i have done something like this..

#!/bin/bash

find $1 -not -type d -printf "%p %Aa %Ad %AH:%AM \n"  | tail -1

exit

*********************************************************

Faculty of Computer and Information Science
Slovenia, Ljubljana
Prof. Peer
Spletna u?ilnica FRI

4. https://www.unix.com/homework-coursew...computers.html

tywm for that..
but i was wondering if u can make something like that?

Code:

 i have done something like this..

#!/bin/bash	

while true do

  for rac in `cat $1` do	
  
    ping -c 3 $rac || echo "Ta racunalnik $i ob `date +%T` ni dosegljiv" >>dnevnik_nedosegljivih.txt (kamor se vpiše njegovo ime in čas, ko ni bil dosegljiv)
	
   done
   
 sleep 300 #(5min*60sec=300 sec)
 
done

exit 0

3. https://www.unix.com/homework-coursew...processes.html

---------- Post updated at 19:26 ---------- Previous update was at 19:20 ----------

Yep, but don't forget to comment the comment, see red mark:

and don't forget the semicolon in the for line, also see red mark.

---------- Post updated at 20:08 ---------- Previous update was at 19:26 ----------

1. Can you accept usage like rename .txt .doc If yes, check this:

Code:

#!/bin/sh

for i in *$1; do
mv "$i" "${i%.*}$2"
done

Test run:

Code:

$ ls
gport.py	label.py	monk.py		rename.sh	test.py
$ ./rename.sh .py .pl
$ ls
gport.pl	label.pl	monk.pl		rename.sh	test.pl
$

Code:

#!/bin/sh

for i in *$1; do
mv "$i" "${i%.*}$2"
done

Test run:

this one makes this

mv: `new file' and `new file' are the same file
mv: `vaja1' and `vaja1' are the same file

so this just deletes extensions..?

How did you exactly call it?
Are you sure you have also supplied the second arg
I also run this script with only one argument and it deleted the extensions.

i name it preimenuj.sh..

and i dont know about 2nd arg :S
u have any idea?