Tagged Questions

3
votes
2answers
106 views

Copy stdout and stderr to a log file and leave them on the console within the script itself

Using bash, how do I copy stderr and stdout to a log file and also leave them displayed on the console? I would like to do this within the script itself using an exec. I tried with exec ...
2
votes
1answer
52 views

Why is it possible to refer to a closed stderr under bash?

I'd like to know why bash doesn't display an error message when we refer to a closed stderr. When it comes to other file descriptors, they have to be opened if we want to, for example, duplicate them. ...
2
votes
1answer
73 views

Stderr of piped shell scripts isn't always displayed

I piped my own shell scripts for some testing and accidentally noticed something strange. Namely, the stderr of those piped processes isn't always displayed on the screen. I simplified the scripts ...
7
votes
2answers
491 views

Does `Segmentation fault` message come under STDERR?

I ran an executable in bash ./code > log It shows occasional error messages on terminal whereas all printf statements go into log file. I re-run it like below ./code >& log Now, the ...
2
votes
2answers
352 views

How to redirect error to a file?

I have this simple script which redirects the output and append it to a file. filename="/home/ronnie/tmp/hello" date=$(date) echo "$date" >> $filename Now, lets suppose I change date=$(date) ...
4
votes
2answers
134 views

Redirect stderr of the double-parentheses construct

I'd like to be able to redirect the stderr of a double-parentheses construct. For example: a=$(($var/$var2)) would output some error messages if $var2 = 0, I do not want the user to see this. I ...