Answer Posted / ahmed

Use sed command
sed -i'' '1 i this is firts line' temp123

Why is grep called grep?

1249

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What is nr in awk command?

1158

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What are file commands?

1192

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What is the size of time_t?

1178

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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:

2221

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What do chgrp command do?

1164

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What is “chmod” command?

1120

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Which command is used to restrict incoming messages?

1064

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What does touch command do in unix?

1365

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What is awk used for?

1098

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What is rmdir command?

1061

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What difference between cmp and diff commands?

1275

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Is there a way to erase all files in the current directory, including all its sub-directories, using only one command?

1363

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Which command is used to kill the last background job?

1306

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What is the use of cut command in unix?

1320

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