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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

 

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LOGSAVE(8)                                                    System Manager's Manual                                                   LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.44.1 March 2018 LOGSAVE(8)
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