In Bash I\'m executing a command and putting the result in a variable like this:
export var=`svn ls`
But if SVN fails for some reason--say it returns a n
I had similar problem, it can be done like this:
rm -f error_marker_file export var=`svn ls || touch error_marker_file` [ -f error_marker_file ] && echo "error in executing svn ls"
export FOO=$(your-command) || echo "your-command failed"
var=`svn ls`
if [[ $? == 0 ]]
then
export var
else
unset var
fi
$?
is the exit code of the last command executed, which is svn ls
here.
jmohr's solution is short and sweet. Adapted mildly,
var=`svn ls` && export var || unset var
would be approximately equivalent to the above (export
of a valid identifier will never fail, unless you've done something horrible and run out of environment space). Take whatever you want -- I use unset
just to avoid $var
possibly having a value even though it's not exported.
var=`svn ls` && export var