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Full Discussion: Trapping $! output
Top Forums Shell Programming and Scripting Trapping $! output Post 302151994 by nhatch on Tuesday 18th of December 2007 06:47:28 AM
Old 12-18-2007
Trapping $! output

hey all,

I have a script that creates and then distributes html files via scp on a 60 second cycle. On occasions the scp will hang and not complete with the cycle.

When running the scp command in the back ground it returns the PID. How do I trap $! in the script?

Code:
job=`echo $!` returns an error. 
-bash-3.00$ job=`echo $!` 
-bash: !`: event not found


What I want to be able to do is monitor how long the scp runs for, if it is still running 2 minutes after starting then it is hung (can't just ps for the scp command as the scp script is used by multiple applications).

Any ideas?

Cheers,
Neil
 

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SCP(1)							    BSD General Commands Manual 						    SCP(1)

NAME
scp -- secure copy (remote file copy program) SYNOPSIS
scp [-pqrvBC46] [-F ssh_config] [-S program] [-P port] [-c cipher] [-i identity_file] [-o ssh_option] [[user@]host1:]file1 [...] [[user@]host2:]file2 DESCRIPTION
scp copies files between hosts on a network. It uses ssh(1) for data transfer, and uses the same authentication and provides the same secu- rity as ssh(1). Unlike rcp(1), scp will ask for passwords or passphrases if they are needed for authentication. Any file name may contain a host and user specification to indicate that the file is to be copied to/from that host. Copies between two remote hosts are permitted. The options are as follows: -c cipher Selects the cipher to use for encrypting the data transfer. This option is directly passed to ssh(1). -i identity_file Selects the file from which the identity (private key) for RSA authentication is read. This option is directly passed to ssh(1). -p Preserves modification times, access times, and modes from the original file. -r Recursively copy entire directories. -v Verbose mode. Causes scp and ssh(1) to print debugging messages about their progress. This is helpful in debugging connection, authentication, and configuration problems. -B Selects batch mode (prevents asking for passwords or passphrases). -q Disables the progress meter. -C Compression enable. Passes the -C flag to ssh(1) to enable compression. -F ssh_config Specifies an alternative per-user configuration file for ssh. This option is directly passed to ssh(1). -P port Specifies the port to connect to on the remote host. Note that this option is written with a capital 'P', because -p is already reserved for preserving the times and modes of the file in rcp(1). -S program Name of program to use for the encrypted connection. The program must understand ssh(1) options. -o ssh_option Can be used to pass options to ssh in the format used in ssh_config(5). This is useful for specifying options for which there is no separate scp command-line flag. For example, forcing the use of protocol version 1 is specified using scp -oProtocol=1. -4 Forces scp to use IPv4 addresses only. -6 Forces scp to use IPv6 addresses only. DIAGNOSTICS
scp exits with 0 on success or >0 if an error occurred. AUTHORS
Timo Rinne <tri@iki.fi> and Tatu Ylonen <ylo@cs.hut.fi> HISTORY
scp is based on the rcp(1) program in BSD source code from the Regents of the University of California. SEE ALSO
rcp(1), sftp(1), ssh(1), ssh-add(1), ssh-agent(1), ssh-keygen(1), ssh_config(5), sshd(8) BSD
September 25, 1999 BSD
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