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Full Discussion: pipes and shells
Top Forums UNIX for Dummies Questions & Answers pipes and shells Post 302246320 by isato on Monday 13th of October 2008 10:36:59 AM
Old 10-13-2008
pipes and shells

Hi
How do I direct the output from ls to for example grep a in C. I am not asking for the whole shell implementation.

If I write ls|grep myfile in the shell. How is the output sent from ls to the input grep. whit int pipe(pipe[2]); We create the pipe. I and I guess we use dup2(old filedescriptor,new filedescriptor);, What should I do whit pipe[0](readend), and the pipe[1](writeend)?

Regards
 

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CHSH(1) 							   User Commands							   CHSH(1)

NAME
chsh - change your login shell SYNOPSIS
chsh [-s shell] [-l] [-u] [-v] [username] DESCRIPTION
chsh is used to change your login shell. If a shell is not given on the command line, chsh prompts for one. chsh is used to change local entries only. Use ypchsh, lchsh or any other implementation for non-local entries. OPTIONS
-s, --shell shell Specify your login shell. -l, --list-shells Print the list of shells listed in /etc/shells and exit. -u, --help Print a usage message and exit. -v, --version Print version information and exit. VALID SHELLS
chsh will accept the full pathname of any executable file on the system. However, it will issue a warning if the shell is not listed in the /etc/shells file. On the other hand, it can also be configured such that it will only accept shells listed in this file, unless you are root. EXIT STATUS
Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid. SEE ALSO
login(1), passwd(5), shells(5) AUTHOR
Salvatore Valente <svalente@mit.edu> AVAILABILITY
The chsh command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux July 2009 CHSH(1)
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