Esercizio 1.

eseguire:

> ps -el > output_ps.txt


1.
da shell eseguire:

> awk '$4 == 1 {print $NF}' output_ps.txt


2.
(($2=="R") || ($2=="R+")){
	printf("%s %s\n", $4, $14); 
}


3.
(($2=="R") || ($2=="R+")){
	vet[$14] = $4
	count_elem++;
}

END{
	for(i=count_elem; i>0; i--){
		max = 0;
		for(j in vet){
			if(!(vet[j] in checked)){
				if(vet[j] > max){
					max = vet[j];
					max_elem = j;
				}
			}
		}
		max_vet[i] = max;
		checked[max] = max_elem;
	}

	for(i=count_elem; i>0; i--){
		printf("%s %s\n", max_vet[i], checked[max_vet[i]]);
	}
}



4.
(($2=="R") || ($2=="R+")){
	print $4 " " $NF >> "temp4"
}

END {
	system ("sort -r -k 1 -n temp4")
	system ("rm -f temp4")
}


(oppure)

awk '$2 ~ /R\+{0,1}$/ {print $4 " " $NF}' output_ps.txt | sort -r -k 1 -n




Esercizio 2.

awk -v file="backup_config.txt" script="backup_script.sh"

BEGIN{
	pos=0;
	neg=0;
	printf("#!/bin/bash\n\n") > script

	while((getline < file)){
		segno[$1]=$2;
	}
}

$1 == "#" {
	backup_dir=$2;
}

$0 ~ /^[^:]*:.*/ {    

	split($0,v,":");
	nome_file=v[1];
	backup_file=v[2];

	if(nome_file in segno){

		if(segno[nome_file]=="+"){
			print "# adding file " nome_file " to archive " backup_dir"/"backup_file >> script
			print "if [ -e " backup_dir"/"backup_file " ]" >> script
			print "then" >> script
			print "\ttar --append -f " backup_dir"/"backup_file " " nome_file >> script
			print "else" >> script
			print "\ttar -cvf " backup_dir"/"backup_file " " nome_file >> script
			print "fi" >> script
			print "" >> script
		}

		else{
			print "# removing file " nome_file " to archive " backup_dir"/"backup_file >> script
			print "if [ -e " backup_dir"/"backup_file " ]" >> script
			print "then" >> script
			print "\ttar --delete -f " backup_dir"/"backup_file " " nome_file >> script
			print "fi" >> script
			print "" >> script
		}
	}
}

END {
	for(chiave in segno){
		if(segno[chiave]=="+")
			pos++;
		else
			neg++;
	}

	printf("Numero file aggiunti %d\n", pos);
	printf("Numero file rimossi %d\n", neg);
}