Best of Technical Support
My machine is a p75 with a Fujitsu hard drive and a Hayes Accura 56kflex external modem. I have 4 partitions: MS-DOS, Caldera, Red Hat and swap. I have a mouse on com1 and a modem on com2. The modem works fine in DOS. In Linux, when I go into X and start seyon, an AT returns “ok” and I can dial out and get a response from a BBS or my ISP.
When I go into minicom, it does not dial out. I wait for a couple of retries and then exit minicom. As soon as I exit, minicom dials out.
If I open minicom in a vt the same thing happens. In all cases the modem init light comes on, but there is no dialing until I exit from minicom.
Can someone please tell me where I am going wrong? No one has been able to help—not Hayes, not the Caldera help line, not any of the lists where I posed the question. Any suggestions will be much appreciated.
Ok, you have a problem with minicom's config somewhere. Now I could be more helpful if I knew if an init string came up or just the familiar “Press ctrl-A Z for help on special settings.” My advice to you is go through the settings and make sure minicom is set up as it should be. (Usually it is set to /dev/modem assuming /dev/modem is a symbolic link to /dev/cua1.) Check your serial port settings and check your init string.
—Mark Bishop, Vice President Southern Illinois Linux Users Group email@example.com
On my home PC, the /var/adm/messages file was getting pretty big. I deleted it, then created a new one with touch. The new file's permissions are identical to the original.
But now, /usr/sbin/syslogd will not run for more than about two minutes. No data is logged to /var/adm/messages anymore. What have I done?
—Bill Cunningham Slackware
syslogd sometimes doesn't like it if the files it has open for writing are modified. Sending SIGHUP (kill -HUP) is usually enough to make it start writing to the file again.
Incidentally, I use the program logrotate to manage my syslog files. It trims them as necessary, archives old files and restarts syslogd as needed after working on the log files. It has made log file management much easier for me.
—Keith Stevenson firstname.lastname@example.org
I want to program multi-threaded applications. Kernel threads are available, I know. But how about thread-safe versions of much used libraries (libc and tcpip communications)?
—Peter Boncz Generic
You can try the LinuxThreads library, which is a free, kernel-level implementation of POSIX 1003.1c threads under Linux (based on the clone system call). For information about compatible libraries, check out http://pauillac.inria.fr/~xleroy/linuxthreads/.
—Pierre Ficheux, Lectra Syst email@example.com
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
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