Redirect Standard Output/error to log file

Question

Looking for a way to redirect std error and std output to a log file in Tcsh shell.

Tried ./ShellFile.sh 2>&1 | pathToLogFile.log and got the error "Ambiguous output redirect"

Would appreciate any inputs.

Solution 1

For a start, it wouldn't be:

./ShellFile.sh 2>&1 | pathToLogFile.log

since that would try and pipe your output through the executable file called pathToLogFile.log rather than sending the output there.

You need:

./ShellFile.sh >& pathToLogFile.log

which redirects both standard output and error to the file.

Solution 2

On a side note, tee(1) may be of use if you want to see output both on the terminal and in a file.

  ./script 2>&1 | tee logfile.txt

Comments

[Sanjeev Kumar Dangi]

thanks for the tip. But this overwrites the contents of pathToLogFile.log. What if we want to just append to the pathToLogFile.log?

[paxdiablo]

@Sanjeev, then you would ask your own question, with the specific requirements, rather than trying to ask a question in a comment field which very few people will see :-) That way, SO functions as intended with specific answers to specific questions. As a hint, you may want to look into >>&.

[Stuart]

In my testing this doesn't work in tcsh, but works in bash.

[Rajasekhar]

Thanks for the answer. Some answers didn't work for c shell and it did.

[Mark Ch]

on raspberry pi this gave the error "Syntax error: Bad fd number"

[paxdiablo]

@MarkCh, my first thought would be either that you're not running tcsh or the version under RaspPi is deficient somehow. It works fine in tcsh under Linux.

[Mark Ch]

@paxdiablo my bad, didn't rtfq. I'll leave my comment there anyway, undoubtedly someone else will make the same mistake.