Linux programs

PROGRAM NO : 1

Inventory file sorting

#!/bin/bash

clear

echo "enter the file name"

read fname

if [ -e $fname ]

then

cat $fname

echo "enter the field number for perform sorting"

read fld

echo "enter the name of the newfile to which output is sorted"

read newfname

sort -k $fld $fname>$newfname

cat $newfname

else

echo "file not found"

fi

PROGRAM NO : 2

Files containing same Pattern in a directory

#!/bin/bash

clear

echo "Enter the Directory name"

read dirname

if [ -d $dirname ]

then

echo "Enter the pattern to be searched"

read pat

grep $pat $dirname/*

else

echo "No such Directory"

fi

PROGRAM NO : 3

Process communication

#include<stdio.h>

main()

{

char s[22];

int pid,p1[2];

pipe(p1);

pid=fork();

if(pid==0)

{

read(p1[0],s,sizeof(s));

printf("\n child process with process id %d\n",pid);

printf("mesage read by child: %s\n",s);

printf("Bye from child\n");

}

else

{

printf("\n Parent Process with processid %d\n",pid);

printf("enter the message to print\n");

scanf("%[^\n]",s);

write(p1[1],s,sizeof(s));

printf("Bye from parent\n");

}

close(p1[1]);

close(p1[0]);

}