1. UNIX for Dummies Questions & Answers

I am trying to find a way to check the current status of a file. Such as some cron job processes are dependent on the completion of others. if a file is currently being accessed / modified or simply open state I will wait until it is done being processed before attempting the next process on that... (3 Replies)

2. UNIX for Dummies Questions & Answers

What is a file descriptor in Unix?? How to find a file descriptor of a file in Unix?? Does it have anything to do with the Inode numbers?? (3 Replies)

3. UNIX for Dummies Questions & Answers

Hi everybody, i am newbie to unix and confused with file pointers and file descripters. could anyone help me to clear my doubts .. when we call unix system calls to create a file then we are dealing wih file descripters i think file descripters are also normals file as stored inhard disks... (1 Reply)

4. Programming

Hi, I want to validate that a file is a socket file on Linux. I know I can do this using the S_ISSOCK macro, but I am not sure how to get the file descriptor for the socket file. For example, I know that /tmp/mapping-foo is a socket file. In Python I can do something like this: >>> import... (2 Replies)

5. Shell Programming and Scripting

Hello All, Im opening a file desciptor in perl and sending data using print CMD "$xyz". is there a limit to the length of the string that I can give to this CMD at a time. (3 Replies)

6. UNIX for Dummies Questions & Answers

Hi What the below path contains? /proc/<pid>/fd (1 Reply)

7. Programming

Hi , i have two basic requirement on linux platform . I am using C language to do this . 1) copying one file to another (assuming i know their file descriptors) 2) Overwriting a file using it file descriptor . Please guide. regards Aki (2 Replies)

8. Shell Programming and Scripting

Hello, How can i use file descriptor in a script to read 2 files at the same time and extract line 200 from file 1 and line 500 from file 2. Thanks. (6 Replies)

9. Shell Programming and Scripting

I am trying to write a script which will only show me the file descriptor count for a process/pid. My script will return me the count only not the whole output. For example, I would like my script to return the output 23 this case, not the whole output. Can anybody please help me how do I get... (11 Replies)

10. Shell Programming and Scripting

Greetings. I am happily using constructs like the following; I have set -x to show fine distinctions. $ exec 4> afile + exec + 4> afile $ print -u4 This is the first line in afileAs you can see from the -x expansion, the shell performed the exec command and redirected file descriptor to... (4 Replies)