I want to create a crontab entry for it. So the solution has to be a one liner as I do not want to write a script and then invoke that script in crontab (with full if else inside a script-file, I can do this easily).

But I want to use some && or || to achieve something like:

cmd1 | cmd2 | cmd3 | wc -l != 0? mail -s "Found xyz"  ...

Is that possible ?

CodePudding user response：

Try this:

test "$(unreadable | long | list | of | commands | in | one | line)" && mail -s ...

It is useless to count the lines, if you just want to know, if the commands produce any output.