Hi,
It still doesn’t explain why this is happening.
If you simply do :
export COLUMNS=60
ps ax | grep java
The output isn’t truncated. Remember that PS’s output goes through a pipe
so the terminal width shouldn’t matter. Without “-a”, we always get the full
output.
It is critical that application’s behaviour do not get impacted by the shell
used to call them. That said, further testing shows a different behavior
# bash
host:/$ echo $COLUMNS
102
host:/$ export COLUMNS
host:/$ ps ax | grep java | head -1
2051669 ? Sl 0:07 /usr/lib/jvm/java-17-openjdk-amd64/bin/java -Xms2g
-Xmx2g -server -XX:+Us
host:/$ export COLUMNS=40
host:/$ ps ax | grep java | head -1
No output whatsoever from the above pipe. So maybe, maybe, a combination
of two bugs,
1. Bash with -a , under some conditions, exports to the environment the
variable COLUMNS which it shouldn’t
2. When COLUMNS is defined, ps behaves strangely
A diff before and after of the environment now gives me a difference :
host[195] diff /tmp/env-before /tmp/env-after
1a2
> COLUMNS=102
36a38
> LINES=35
The strange thing is that I had tested the environment and hadn’t detected
a change before. I must have made a mistake on that one.
What do you think ?
Regards,
Alain
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From: Oğuz <oguzismailuy...@gmail.com>
Sent: Thursday, June 13, 2024 4:25 PM
To: Alain BROSSARD <abross...@reyl.com>
Cc: bug-bash@gnu.org
Subject: Re: set -a leads to truncated output from ps
On Thursday, June 13, 2024, Alain BROSSARD via Bug reports for the GNU Bourne
Again SHell <bug-bash@ gnu. org> wrote: # however, the second one has truncated
output to the terminal width Looks like `set -a' exports COLUMNS for some
reason,
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On Thursday, June 13, 2024, Alain BROSSARD via Bug reports for the GNU Bourne
Again SHell <bug-bash@gnu.org<mailto:bug-bash@gnu.org>> wrote:
# however, the second one has truncated output to the terminal width
Looks like `set -a' exports COLUMNS for some reason, this must be a bug
$ set -a
$ env | grep COLUMNS
$ env | grep COLUMNS
COLUMNS=64
You should call ps with the option -w if you want wide output though. On some
implementations you can disable truncation completely by specifying it twice
like `ps axww'.
--
Oğuz
