Sponsored Content
Top Forums Shell Programming and Scripting capturing exceptions from an scp clause Post 302601781 by Corona688 on Friday 24th of February 2012 10:56:00 AM
Old 02-24-2012
You don't need to use $? when checking a command's return value. You can check the command directly.

Code:
if ! scp source destination
then
        echo "something bad happened" >&2
fi

Or even
Code:
scp source destination || echo "something bad happened" >&2

If anything goes wrong, it will likely print an error to standard error. If you redirect standard error into a logfile yourself before you run it, all error messages will go into it.

Code:
exec 2>path/to/logfile

touch / # Since you're not root, this should print 'permission denied' into logfile

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

exceptions in import

Hello, I want to import an Oracle database file on my fresh DB, bought before successfully with exp command. But is it possible to import some tables from the dmp file, because they are too large and it's so long !? I didn't find any option in imp command to make exception on certain tables...... (1 Reply)
Discussion started by: madmat
1 Replies

2. UNIX for Dummies Questions & Answers

if clause

hi, pls could you help me with one program in KSH ( i have sunOS). I need to create an If clause, that prints an error message and filenames, when in a directory are found some files of null size (find . -type f -size 0 ). thanks (3 Replies)
Discussion started by: palmer18
3 Replies

3. UNIX for Advanced & Expert Users

Remove directory with exceptions

Hi, I want to remove a directory recursively except the inside directories calles .SYNC (designsync dirs) I am looking for something like: \rm -rf < find . * | grep -v .SYNC The find works ok but I do not know how to redirect it. Please help. Regards, Ziv:rolleyes: (1 Reply)
Discussion started by: zivsegal
1 Replies

4. Shell Programming and Scripting

Remove directory with exceptions

Hi, I want to remove a directory recursively except the inside directories calles .SYNC (designsync dirs) I am looking for something like: \rm -rf < find . * | grep -v .SYNC The find works ok but I do not know how to redirect it. Please help. Regards, Ziv (3 Replies)
Discussion started by: zivsegal
3 Replies

5. UNIX for Advanced & Expert Users

java Exceptions color

Hi, I call a java program from a cron job and i need to display the exceptions or Errors thrown by java(basically stacktrace) in the unix/linux console in the red color.Is it possible to do that? If so, pls. give me some pointers how to do that. eg: Exception in thread "main"... (0 Replies)
Discussion started by: ramse8pc
0 Replies

6. UNIX for Dummies Questions & Answers

Diff with exceptions Question

So I'm currently developing an automated test system and I'm verifying my results by running a set of baselined data through and comparing the output (which is in a txt file) to a baseline results file. So of course I'm just using the diff command. Unfortunately each time I run the test there are 2... (3 Replies)
Discussion started by: Smitty0881
3 Replies

7. Programming

Relationship between exceptions and signals

Hi everyone, I am using AIX 6.1. There are exception codes defined in header file sys/m_except.hAlso, in the documentation (in "Understanding exception handling") it says: If no exception handler is currently defined when an exception occurs, typically one of two things happens. If... (0 Replies)
Discussion started by: manolo123
0 Replies

8. IP Networking

SIGUP Exceptions during the execution

hello, I am getting SIGUP Exceptions during an execution of a procedure. Below is the log: Type: SignalException Message: SIGHUP Backtrace: 12:38 PM Action threw an exception: SIGHUP 12:38 PM Action threw an exception: SIGHUP E, ERROR -- : Type: SignalException Message: SIGHUP... (1 Reply)
Discussion started by: Deepthi.Prakash
1 Replies

9. Shell Programming and Scripting

Wildcards and exceptions

Hello: I have a very basic question. I'd like to select all files except for one file. For example, say I want to move all of the files in my current directory to a subdirectory called archive, I would use mv ./* archive/ But what if I want to move all files except for README.txt? Is there an... (19 Replies)
Discussion started by: Danny.Boy
19 Replies

10. Shell Programming and Scripting

RegEx with exceptions

I am totaly new to RegEx, but I need to extract emails with RegEx from text file Some difficulties: 1. “@”symbol has been substituted for “ at ”,"AT" or "(at)" 2. I do not need any email with domain "myoldcompany" I found that with these I can found any emails: "^+@+\.+$" How to do... (1 Reply)
Discussion started by: AIX_30
1 Replies
SCP(3pm)						User Contributed Perl Documentation						  SCP(3pm)

NAME
Net::SCP - Perl extension for secure copy protocol SYNOPSIS
#procedural interface use Net::SCP qw(scp iscp); scp($source, $destination); iscp($source, $destination); #shows command, asks for confirmation, and #allows user to type a password on tty #OO interface $scp = Net::SCP->new( "hostname", "username" ); #with named params $scp = Net::SCP->new( { "host"=>$hostname, "user"=>$username } ); $scp->get("filename") or die $scp->{errstr}; $scp->put("filename") or die $scp->{errstr}; #tmtowtdi $scp = new Net::SCP; $scp->scp($source, $destination); #Net::FTP-style $scp = Net::SCP->new("hostname"); $scp->login("user"); $scp->cwd("/dir"); $scp->size("file"); $scp->get("file"); DESCRIPTION
Simple wrappers around ssh and scp commands. SUBROUTINES
scp SOURCE, DESTINATION Can be called either as a subroutine or a method; however, the subroutine interface is depriciated. Calls scp in batch mode, with the -B -p -q and -r options. Returns false upon error, with a text error message accessable in $scp->{errstr}. Returns false and sets the errstr attribute if there is an error. iscp SOURCE, DESTINATION Can be called either as a subroutine or a method; however, the subroutine interface is depriciated. Prints the scp command to be execute, waits for the user to confirm, and (optionally) executes scp, with the -p and -r flags. Returns false and sets the errstr attribute if there is an error. METHODS
new HOSTNAME [ USER ] | HASHREF This is the constructor for a new Net::SCP object. You must specify a hostname, and may optionally provide a user. Alternatively, you may pass a hashref of named params, with the following keys: host - hostname user - username interactive - bool cwd - current working directory on remote server login [USER] Compatibility method. Optionally sets the user. cwd CWD Sets the cwd (used for a subsequent get or put request without a full pathname). get REMOTE_FILE [, LOCAL_FILE] Uses scp to transfer REMOTE_FILE from the remote host. If a local filename is omitted, uses the basename of the remote file. mkdir DIRECTORY Makes a directory on the remote server. Returns false and sets the errstr attribute on errors. (Implementation note: An ssh connection is established to the remote machine and '/bin/mkdir -p' is used to create the directory.) size FILE Returns the size in bytes for the given file as stored on the remote server. Returns 0 on error, and sets the errstr attribute. In the case of an actual zero-length file on the remote server, the special value '0e0' is returned, which evaluates to zero when used as a number, but is true. (Implementation note: An ssh connection is established to the remote machine and wc is used to determine the file size.) put LOCAL_FILE [, REMOTE_FILE] Uses scp to trasnfer LOCAL_FILE to the remote host. If a remote filename is omitted, uses the basename of the local file. binary Compatibility method: does nothing; returns true. quit Compatibility method: does nothing; returns true. FREQUENTLY ASKED QUESTIONS
Q: How do you supply a password to connect with ssh within a perl script using the Net::SSH module? A: You don't (at least not with this module). Use RSA or DSA keys. See the quick help in the next section and the ssh-keygen(1) manpage. A #2: See Net::SCP::Expect instead. Q: My script is "leaking" scp processes. A: See "How do I avoid zombies on a Unix system" in perlfaq8, IPC::Open2, IPC::Open3 and "waitpid" in perlfunc. GENERATING AND USING SSH KEYS
1 Generate keys Type: ssh-keygen -t rsa And do not enter a passphrase unless you wanted to be prompted for one during file copying. Here is what you will see: $ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/User/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/User/.ssh/id_rsa. Your public key has been saved in /home/User/.ssh/id_rsa.pub. The key fingerprint is: 5a:cd:2b:0a:cd:d9:15:85:26:79:40:0c:55:2a:f4:23 User@JEFF-CPU 2 Copy public to machines you want to upload to "id_rsa.pub" is your public key. Copy it to "~/.ssh" on target machine. Put a copy of the public key file on each machine you want to log into. Name the copy "authorized_keys" (some implementations name this file "authorized_keys2") Then type: chmod 600 authorized_keys Then make sure your home dir on the remote machine is not group or world writeable. AUTHORS
Could really use a maintainer with enough time to at least review and apply patches more patches. Or the module should just be deprecated in favor of Net::SFTP::Expect or Net::SFTP::Foreign and made into a simple compatiblity wrapper. Ivan Kohler <ivan-netscp_pod@420.am> Major updates Anthony Deaver <bishop@projectmagnus.org> Thanks to Jon Gunnip <jon@soundbite.com> for fixing a bug with size(). Patch for the mkdir method by Anthony Awtrey <tony@awtrey.com>. Thanks to terrence brannon <tbone@directsynergy.com> for the documentation in the GENERATING AND USING SSH KEYS section. COPYRIGHT
Copyright (c) 2000 Ivan Kohler Copyright (c) 2007 Freeside Internet Services, Inc. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. BUGS
Still has no-OO cruft. In order to work around some problems with commercial SSH2, if the source file is on the local system, and is not a directory, the -r flag is omitted. It's probably better just to use OpenSSH <http://www.openssh.com/> which is the de-facto standard these days anyway. The Net::FTP-style OO stuff is kinda lame. And incomplete. iscp doesnt expect you to be logging into the box that you are copying to for the first time. so it's completely clueless about how to handle the whole 'add this file to known hosts' message so it just hangs after the user hits y. (Thanks to John L. Utz III). To avoid this, SSH to the box once first. SEE ALSO
For a perl implementation that does not require the system scp command, see Net::SFTP instead. For a wrapper version that allows you to use passwords, see Net::SCP::Expect instead. For a wrapper version of the newer SFTP protocol, see Net::SFTP::Foreign instead. Net::SSH, Net::SSH::Perl, Net::SSH::Expect, Net::SSH2, IPC::PerlSSH scp(1), ssh(1), IO::File, IPC::Open2, IPC::Open3 perl v5.10.0 2007-10-26 SCP(3pm)
All times are GMT -4. The time now is 12:59 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy