Answer Posted / nashiinformaticssolutions

File permissions in Unix control the access levels for files and directories. They determine who can read, write, or execute a file. Permissions are represented in a triplet format for the owner, group, and others (e.g., rwxr-xr--).
• r: Read permission.
• w: Write permission.
• x: Execute permission.
Permissions can also be represented numerically using a three-digit code, where each digit ranges from 0 to 7 (e.g., 755). The digits represent the sum of the permission values (4 for read, 2 for write, 1 for execute).

What does this command do,"$more readme.txt“?

1161

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How to display no of records in oracle using unix command?

1176

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What is the use of egrep command in unix?

1196

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What are the general commands in using unix os for a beginner?

1175

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

1232

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Differentiate cmp command from diff command.

1180

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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

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What does the command ' $who | sort –logfile > newfile' do?

1280

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What does #!/ Bin sh do?

1068

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Write a command that will allow a unix system to shut down in 15 minutes, after which it will perform a reboot.

1251

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What does the “echo” command do?

1161

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What is a command and examples?

1241

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Explain ‘library functions’ with respect to unix commands?

1175

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What is the difference between cat command and more command?

1211

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Name the unix command to find how many days the server has been up.

1167

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