如何在shell sh脚本中匆忙获取错误及其代码？

Question

I'm launching some drush commands inside a shell script sh. How can i get if the command has terminated with no error? And, in case of error, how can i get the error and present it to the user executing the script?

Answer 1

As I said in my first comment if you put together a shell script with drush commands the user executing the script will see all the messages drush writes to the console. But if you want to write a more complex script, ie with checks for errors etc. then here is a short example that should get you started:

msg=$(drush blah 2>&1)
if [[ "$msg" =~ error* ]]
then
  echo "we had an error!"
else
  echo "success"
fi
msg=$(drush cc all 2>&1)
echo $msg

NOTE: this script assumes that you have a bash shell.

The construct $(command) is used to pipe stdout to a variable. Since drush pipes error messages to stderr we also need suffix the drush command with 2>&1 which is a command to redirect stderr to stdout. The if check is then basically a substring check for "error" in the $msg variable.

Here is a good resource for Bash programming:

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html

Hope this helps.

=========== EDIT =============

if you are in a Bourne shell you would use the following to redirect output to a variable:

msg=`drush cc all 2>&1`

You should be able to see which shell you are using by executing echo $SHELL