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Pipe stderr only if a terminal application crashes
The 2019 Stack Overflow Developer Survey Results Are InRedirect stderr from an already running scriptRedirect stdout and stderr, with timestamps on stderr onlyHow to strip color codes out of stdout and pipe to file and stdoutHow to capture ordered STDOUT/STDERR and add timestamp/prefixes?A way to distinguish between interleaved output from two background processesBash interactive mode on redirectWhy is /dev/stderr invalid when redirecting to a pipe in cygwin?Send stderr to a different receiver in pipeDetermine if process was launched directly from a terminal window or programmatically as a child processUsing pipe STDOUT as a variable?
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I have a program which interacts with the user on the terminal.
But if it crashes I'd like to pipe the stderr through another tool to tidy / prettyprint it.
Is there a way to do this?
As far as I can see, the ways of redirecting the stderr all involve doing something with stdout, and that hides / disrupts the interactive terminal.
bash pipe
asked 2 days ago
interstarinterstar
3621821
add a comment |
I have a program which interacts with the user on the terminal.
But if it crashes I'd like to pipe the stderr through another tool to tidy / prettyprint it.
Is there a way to do this?
As far as I can see, the ways of redirecting the stderr all involve doing something with stdout, and that hides / disrupts the interactive terminal.
bash pipe
asked 2 days ago
interstarinterstar
3621821
Are you asking about the pretty printing, or about how to arrange for that other tool to get the error output, or both?
– Kusalananda♦
yesterday
What I really want right now is the pretty-printing what comes out on stderr if the interactive program crashes. I thought this would be the general case that would also solve that. But I'm open to other solutions
– interstar
yesterday
1
Are you able to get the program to do logging to a file, i.e. from the program itself?
– Kusalananda♦
yesterday
Not simply. If this can't be done, then it can't be done, and I'll have to look for another solution. Exactly explicitly trying to intercept errors etc. I was just hoping there was some command-line / pipeline magic that could solve it.
– interstar
yesterday
add a comment |
I have a program which interacts with the user on the terminal.
But if it crashes I'd like to pipe the stderr through another tool to tidy / prettyprint it.
Is there a way to do this?
As far as I can see, the ways of redirecting the stderr all involve doing something with stdout, and that hides / disrupts the interactive terminal.
bash pipe
asked 2 days ago
interstarinterstar
3621821
I have a program which interacts with the user on the terminal.
But if it crashes I'd like to pipe the stderr through another tool to tidy / prettyprint it.
Is there a way to do this?
As far as I can see, the ways of redirecting the stderr all involve doing something with stdout, and that hides / disrupts the interactive terminal.
bash pipe
bash pipe
asked 2 days ago
interstarinterstar
3621821
asked 2 days ago
interstarinterstar
3621821
asked 2 days ago
interstarinterstar
3621821
asked 2 days ago
interstarinterstar
3621821
asked 2 days ago
interstarinterstar
3621821
3621821
Are you asking about the pretty printing, or about how to arrange for that other tool to get the error output, or both?
– Kusalananda♦
yesterday
What I really want right now is the pretty-printing what comes out on stderr if the interactive program crashes. I thought this would be the general case that would also solve that. But I'm open to other solutions
– interstar
yesterday
1
Are you able to get the program to do logging to a file, i.e. from the program itself?
– Kusalananda♦
yesterday
Not simply. If this can't be done, then it can't be done, and I'll have to look for another solution. Exactly explicitly trying to intercept errors etc. I was just hoping there was some command-line / pipeline magic that could solve it.
– interstar
yesterday
add a comment |
Are you asking about the pretty printing, or about how to arrange for that other tool to get the error output, or both?
– Kusalananda♦
yesterday
What I really want right now is the pretty-printing what comes out on stderr if the interactive program crashes. I thought this would be the general case that would also solve that. But I'm open to other solutions
– interstar
yesterday
1
Are you able to get the program to do logging to a file, i.e. from the program itself?
– Kusalananda♦
yesterday
Not simply. If this can't be done, then it can't be done, and I'll have to look for another solution. Exactly explicitly trying to intercept errors etc. I was just hoping there was some command-line / pipeline magic that could solve it.
– interstar
yesterday
Are you asking about the pretty printing, or about how to arrange for that other tool to get the error output, or both?
– Kusalananda♦
yesterday
Are you asking about the pretty printing, or about how to arrange for that other tool to get the error output, or both?
– Kusalananda♦
yesterday
What I really want right now is the pretty-printing what comes out on stderr if the interactive program crashes. I thought this would be the general case that would also solve that. But I'm open to other solutions
– interstar
yesterday
What I really want right now is the pretty-printing what comes out on stderr if the interactive program crashes. I thought this would be the general case that would also solve that. But I'm open to other solutions
– interstar
yesterday
1
1
Are you able to get the program to do logging to a file, i.e. from the program itself?
– Kusalananda♦
yesterday
Are you able to get the program to do logging to a file, i.e. from the program itself?
– Kusalananda♦
yesterday
Not simply. If this can't be done, then it can't be done, and I'll have to look for another solution. Exactly explicitly trying to intercept errors etc. I was just hoping there was some command-line / pipeline magic that could solve it.
– interstar
yesterday
Not simply. If this can't be done, then it can't be done, and I'll have to look for another solution. Exactly explicitly trying to intercept errors etc. I was just hoping there was some command-line / pipeline magic that could solve it.
– interstar
yesterday
add a comment |
1 Answer
1
active
oldest
votes
You might have to wrap the program in a small bash script, but it's doable. You can redirect stderr to a file while leaving stdout to display on the screen:
#!/usr/bin/env bash
# Run my program, with stderr saved to a file
my_program 2> /tmp/stderr_output.txt
# If the program returned with anything but success, print stderr
if [ ! $! ]; then
cat /tmp/stderr_output.txt
fi
Instead of just using the cat utility, you could use your formatting utility to output the error text.
answered 2 days ago
Jacob HumeJacob Hume
1785
4
$!is the PID of the most recent background task, The return status is in$?. You can't test for a non-zero integer with[ ! $? ](this tests for an empty string, as with[ -z $? ]). It would be better to just useif ! my_program 2>file; then ...; fi.
– Kusalananda♦
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
1
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
So basically, can't be done then?
– interstar
yesterday
add a comment |
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1 Answer
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oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You might have to wrap the program in a small bash script, but it's doable. You can redirect stderr to a file while leaving stdout to display on the screen:
#!/usr/bin/env bash
# Run my program, with stderr saved to a file
my_program 2> /tmp/stderr_output.txt
# If the program returned with anything but success, print stderr
if [ ! $! ]; then
cat /tmp/stderr_output.txt
fi
Instead of just using the cat utility, you could use your formatting utility to output the error text.
answered 2 days ago
Jacob HumeJacob Hume
1785
4
$!is the PID of the most recent background task, The return status is in$?. You can't test for a non-zero integer with[ ! $? ](this tests for an empty string, as with[ -z $? ]). It would be better to just useif ! my_program 2>file; then ...; fi.
– Kusalananda♦
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
1
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
So basically, can't be done then?
– interstar
yesterday
add a comment |
You might have to wrap the program in a small bash script, but it's doable. You can redirect stderr to a file while leaving stdout to display on the screen:
#!/usr/bin/env bash
# Run my program, with stderr saved to a file
my_program 2> /tmp/stderr_output.txt
# If the program returned with anything but success, print stderr
if [ ! $! ]; then
cat /tmp/stderr_output.txt
fi
Instead of just using the cat utility, you could use your formatting utility to output the error text.
answered 2 days ago
Jacob HumeJacob Hume
1785
4
$!is the PID of the most recent background task, The return status is in$?. You can't test for a non-zero integer with[ ! $? ](this tests for an empty string, as with[ -z $? ]). It would be better to just useif ! my_program 2>file; then ...; fi.
– Kusalananda♦
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
1
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
So basically, can't be done then?
– interstar
yesterday
add a comment |
You might have to wrap the program in a small bash script, but it's doable. You can redirect stderr to a file while leaving stdout to display on the screen:
#!/usr/bin/env bash
# Run my program, with stderr saved to a file
my_program 2> /tmp/stderr_output.txt
# If the program returned with anything but success, print stderr
if [ ! $! ]; then
cat /tmp/stderr_output.txt
fi
Instead of just using the cat utility, you could use your formatting utility to output the error text.
answered 2 days ago
Jacob HumeJacob Hume
1785
You might have to wrap the program in a small bash script, but it's doable. You can redirect stderr to a file while leaving stdout to display on the screen:
#!/usr/bin/env bash
# Run my program, with stderr saved to a file
my_program 2> /tmp/stderr_output.txt
# If the program returned with anything but success, print stderr
if [ ! $! ]; then
cat /tmp/stderr_output.txt
fi
Instead of just using the cat utility, you could use your formatting utility to output the error text.
answered 2 days ago
Jacob HumeJacob Hume
1785
answered 2 days ago
Jacob HumeJacob Hume
1785
answered 2 days ago
Jacob HumeJacob Hume
1785
answered 2 days ago
Jacob HumeJacob Hume
1785
1785
4
$!is the PID of the most recent background task, The return status is in$?. You can't test for a non-zero integer with[ ! $? ](this tests for an empty string, as with[ -z $? ]). It would be better to just useif ! my_program 2>file; then ...; fi.
– Kusalananda♦
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
1
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
So basically, can't be done then?
– interstar
yesterday
add a comment |
4
$!is the PID of the most recent background task, The return status is in$?. You can't test for a non-zero integer with[ ! $? ](this tests for an empty string, as with[ -z $? ]). It would be better to just useif ! my_program 2>file; then ...; fi.
– Kusalananda♦
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
1
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
So basically, can't be done then?
– interstar
yesterday
4
4
$! is the PID of the most recent background task, The return status is in $?. You can't test for a non-zero integer with [ ! $? ] (this tests for an empty string, as with [ -z $? ]). It would be better to just use if ! my_program 2>file; then ...; fi.– Kusalananda♦
yesterday
$! is the PID of the most recent background task, The return status is in $?. You can't test for a non-zero integer with [ ! $? ] (this tests for an empty string, as with [ -z $? ]). It would be better to just use if ! my_program 2>file; then ...; fi.– Kusalananda♦
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
Doesn't seem to work. If I do my_program 2> /tmp/errors.txt that still blocks my interaction on the terminal
– interstar
yesterday
1
1
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
@interstar Prompts etc. (interactive dialog with the user) happens on standard error. Redirecting it to a file would put all of that into the file.
– Kusalananda♦
yesterday
So basically, can't be done then?
– interstar
yesterday
So basically, can't be done then?
– interstar
yesterday
add a comment |
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-bash, pipe
Are you asking about the pretty printing, or about how to arrange for that other tool to get the error output, or both?
– Kusalananda♦
yesterday
What I really want right now is the pretty-printing what comes out on stderr if the interactive program crashes. I thought this would be the general case that would also solve that. But I'm open to other solutions
– interstar
yesterday
1
Are you able to get the program to do logging to a file, i.e. from the program itself?
– Kusalananda♦
yesterday
Not simply. If this can't be done, then it can't be done, and I'll have to look for another solution. Exactly explicitly trying to intercept errors etc. I was just hoping there was some command-line / pipeline magic that could solve it.
– interstar
yesterday