Answer Posted / prashant

The main difference between touch and cat command is that
touch command is basically used for changing TIME-STAMP
which includes modification time,access time etc as well as
used for creating empty files.
Whereas cat command full form is concatenation ....
means it is used for displaying the content of file
as well as concatenation of files in one single file.

What is the use of awk command in unix?

1136

---

What's a command word?

1182

---

What is rmdir command?

1113

---

What is grep and how do you use it?

1118

---

What is pipe command in unix?

1307

---

What is grep short for?

1051

---

How do you grep recursively?

1111

---

What is command substitution?

1376

---

Explain ‘library functions’ with respect to unix commands?

1175

---

When i run a programm of orphan process. Instead of getting child's parent (ppid)=1 ..i get 1400 and it varies as per system. How can i findthe right soluion??? My pgm: #include # include int main() { int pid; pid=fork(); if(pid < 0) {exit(-1);} else if(pid==0) { printf("Child Process is Sleeping ..."); sleep(10); printf("Orphan Child's Parent ID : %u ",getppid()); } else { printf("Parent Process Completed ... %u ",getpid()); exit(0); } return 0; } Output:

2273

---

What are the differences among a system call, a library function, and a unix command?

1232

---

What is the nmap command?

1192

---

What does grep v do?

1059

---

What is the comma to show the space allocation of files?

1094

---

What are reported commands?

1134

---