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Operating Systems Linux Shell implementation - Command not found Post 302562994 by mmurali2 on Sunday 9th of October 2011 02:40:56 PM
Old 10-09-2011
Shell implementation - Command not found

Hi,
I am trying to execute a program with pipes to run a few basic commands by forking children. When I try to run commands in the child process without pipe, I am unable to run the command as execv fails. However for commands that are given with pipes execute successfully.

for example:
when I try to execute a command such as 'sftp', after searching all the available path in my $PATH variable, it does it not detect it under /usr/bin/sftp folder. But however if I give it as a part of the pipe such as 'pwd|sftp', it detects the presence of sftp in the /usr/bin folder and successfully executes it.

Can some one help me with what causes this wierd behaviour ?

Code:
my$hell% sftp

command = /usr/local/bin/sftp, size = 4

command = /usr/bin/sftp

command = /bin/sftp

command = /usr/games/sftp

command = /usr/local/sbin/sftp

command = /usr/sbin/sftp

command = /sbin/sftp

command = /home/rockydj/bin/sftp

/home/rockydj/bin/sftp
sftp: command cannot be found...


my$hell% pwd|sftp

command = /usr/local/bin/sftp

command = /usr/bin/sftp

command inside = /usr/bin/sftp
usage: sftp [-1246Cpqrv] [-B buffer_size] [-b batchfile] [-c cipher]
          [-D sftp_server_path] [-F ssh_config] [-i identity_file]
          [-o ssh_option] [-P port] [-R num_requests] [-S program]
          [-s subsystem | sftp_server] host
       sftp [user@]host[:file ...]
       sftp [user@]host[:dir[/]]
       sftp -b batchfile [user@]host
my$hell%

NOTE:Both runs through the same part of the code to execute the command

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Last edited by radoulov; 10-09-2011 at 04:22 PM..
 

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sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

NAME
sftp-server - SFTP server subsystem SYNOPSIS
/usr/lib/ssh/sftp-server DESCRIPTION
sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer. sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings. To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config: Subsystem sftp /usr/lib/ssh/sftp-server See sshd_config(4) for a description of the format and contents of that file. There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/usr/lib/sftp-server ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsshdu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5) To view license terms, attribution, and copyright for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed location. AUTHOR
Markus Friedl SunOS 5.10 30 Jul 2003 sftp-server(1M)
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