1. Programming

I'm implementing a shell in C that supports piping, output redirection, and background processing, and a few other commands. I was wondering how I'd go about implementing the output redirection. So, I'd open a file and I'd fork and execute the command. But how would I get stdout into the file? Any... (10 Replies)

2. Programming

Hi, I am implementing a shell in C, with the following problem... Suppose the shell is invoked from the command line as >> myshell < test.in > test.out 2>&1 I have to execute the commands in test.in and redirect them to test.out How does one detect in the main function that the shell... (1 Reply)

3. Programming

Hi all I am facing a problem with redirection. Its somewhat related to parsing. I am following the following steps. 1. take the command and tokenize it. 2. if redirection is there then give it to redirection unit 3. if pipe is there give it to piping unit. 4. do until the command ends ... (0 Replies)

4. IP Networking

i have a client server connection steady and running... but the problem here is that the file transfer is very crude and succeptible to risks... so i want to implement ftp.. can anybody suggest a way to implement it or any book to read? (4 Replies)

5. UNIX for Dummies Questions & Answers

Hi Can anybody tell the difference between Difference between cat , cat > , cat >> and touch command in UNIX? Thanks (6 Replies)

6. Shell Programming and Scripting

Hello, So I sorted my file as I was supposed to: sort -n -r -k 2 -k 1 file1 | uniq > file2 and when I wrote > cat file2 in the command line, I got what I was expecting, but in the script itself ... sort -n -r -k 2 -k 1 averages | uniq > temp cat file2 It wrote a whole... (21 Replies)

7. Shell Programming and Scripting

I'm trying to add logging to an existing script which echos a number of lines to the screen. I've added a switch to the script that is going to suppress much of this output and put it in a file instead. The way I envisioned it was like this: $log would be set to either "" or the log files... (8 Replies)

8. Shell Programming and Scripting

i have following input file... 00290002STDR000000000000000000000000000EOD END TRANSACTION ^@^@^@^@^@^@^@^@^@^@^@^@^ 00299998STDR070000000007000000000000000STANDING DEBITS ^@^@^@^@^@^@^@^@^@^@^@^@^... (1 Reply)

9. Shell Programming and Scripting

Hello All, I am trying a shell script for automatically login to test servers and pulling the output of top command from all using expect. ----snippet of code --- #!/usr/bin/expect -f #!/bin/bash server1=10.251.222.51 server=("$server1") i=1 for exp_server in ${server}; do expect -c... (3 Replies)