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seen Sep 22 at 6:49

Aug
13
revised X does not load after debian upgrade
Xorg.0.log --> Xorg.1.log
Aug
13
comment X does not load after debian upgrade
@vinc17: Good points. I had just confirmed this by ls -lrt /log/var/Xorg*, which shows log 1 to be the valid file. After searching for warnings and errors in this log file (egrep "WW|EE"), additional warnings were found (added these as an "edit" to the question).
Aug
13
comment X does not load after debian upgrade
@arnefm: After doing this, the following line appears in startx.log: /usr/bin/startxfce4: X server already running on display :1. Note that I did this on VT ctrl+alt+F1 rather than ctrl+alt+F2, as in my response to pqnet (though I don't think that this matters).
Aug
13
comment X does not load after debian upgrade
@pqnet: Pressing ctrl+alt+F1 at the frozen screen permits display of the few boot messages that normally occur and then disappear and also shows additional lines Debian GNU/Linux jessie/sid [hostname] tty1. Just below this line is a prompt ([hostname] login:) allowing me to login. Thus, the problem does seem to be X-related.
Aug
13
comment X does not load after debian upgrade
@vinc17: I rebooted several times after upgrade, but I'm not quite sure how to interpret the timestamp. I was thinking they might be in ms post-reboot, but no units are provided.
Aug
13
comment X does not load after debian upgrade
@pqnet: Sorry to not have added enough pertinent information. I have updated the question accordingly. I notice that uname -a shows deb7u3, whereas "jessie" (debian testing) is deb8. Perhaps the upgrade did not go to completion?
Aug
13
revised X does not load after debian upgrade
added system information
Aug
13
asked X does not load after debian upgrade
Aug
13
asked lpr with reverse video
Aug
11
comment pipe line with non-deterministic output
Thanks, that's a good idea. I'll use that. Particularly when a process is quite compute- or IO-intensive (my actual data files are gigabytes), obviating the need for process re-execution (saving a result from the first execution in a variable or temporary file to be read and used during the second execution) is desirable. Thanks for mentioning the preferred match/action formulation as well. I'm aware of it, but rarely make use of it, as resorting to the if statement has become a pernicious habit of mine.
Aug
11
comment pipe line with non-deterministic output
Thanks for linking to an interesting discussion. I am inclined to favor the zsh model of synchronizing the processes. It's interesting that the first process after the tee will finish first if a sleep is imposed, but finish either first or second (pseudo-randomly) if not.
Aug
11
accepted pipe line with non-deterministic output
Aug
11
comment pipe line with non-deterministic output
strategy in the example. I was merely trying to condense the workflow into a "one-liner" more for the concision of such a formulation than anything else. Initially, I wanted to avoid writing temporary files as well and tried to pipe the output of the >(...) process substitution to a read statement to subsequently pass the variable as an argument to the later awk script, only to discover that read cannot be used in this process because a child process, the state of the >(...) construct, has not the ability to alter the environment of its parent process.
Aug
11
comment pipe line with non-deterministic output
Thanks for a truly exceptional explanation. I was laboring under a flawed understanding of pipelines, which I erroneously perceived to operate in a completely serial fashion. It's true that the tee statement produces parallel processes, so even though I wrote the process for variable definition first, there is no reason to expect that it will begin or finish first. Also, I had no idea that the pipes were constructed at the outset, and instead naïvely believed that each pipe was constructed after completion of the preceding process. There is no fundamental reason that I need to employ the ...
Aug
11
revised pipe line with non-deterministic output
added 185 characters in body
Aug
11
asked pipe line with non-deterministic output
Jul
31
comment grep variable-length optional text
Yes, the attempt can be enjoyable as a thought exercise, though in the end, our goal as a programmer, as you have noted, must be efficiency.
Jul
31
accepted grep variable-length optional text
Jul
31
comment grep variable-length optional text
You make an excellent point. I was operating under the impression that a regex equivalent to the family would be the most elegant solution, but failed to appreciate that constructing the family as a set of string literals would be computationally much less expensive, and moreover that the difference in computational overhead between the two approaches would scale with the size of the file to be examined.
Jul
31
awarded  Custodian