Every minute of every day of every week of every month, that command runs. man 5 crontab has the documentation of this. If you just type man crontab, you get the documentation for the crontab command. What you want is section 5 of the manual pages which covers system configuration files including the /etc/crontab file. … Read more
With some further investigation, it appears that the performance problem is mostly due to a high number of network calls between two systems (Oracle SSXA and UCM). The calls are quick but plenty and serialized, hence the low CPU usage (mostly waiting for I/O), the high load average (many calls waiting to be processed) and … Read more
Bash has a “loadable” sleep which supports fractional seconds, and eliminates overheads of an external command: $ cd bash-3.2.48/examples/loadables $ make sleep && mv sleep sleep.so $ enable -f sleep.so sleep Then: $ which sleep /usr/bin/sleep $ builtin sleep sleep: usage: sleep seconds[.fraction] $ time (for f in `seq 1 10`; do builtin sleep 0.1; … Read more
I’m sure someone else has a better answer, but With “less” after you’ve opened the file: G goes to the bottom of the file ^b goes up one page ? searches backwards. As you said, you can open the file with +G and then use ? and ^b to scroll up. There are likely clever … Read more
Here is a rough explanation of the concepts. [ACK] is the acknowledgement that the previously sent data packet was received. [FIN] is sent by a host when it wants to terminate the connection; the TCP protocol requires both endpoints to send the termination request (i.e. FIN). So, suppose host A sends a data packet to host B and then host B wants … Read more
Follow the steps below: 1) Select your VM Instance. Go to Settings->Storage 2) Under the storage tree select the default image or “Empty”(which ever is present) 3) Under the attributes frame, click on the CD image and select “Choose a virtual CD/DVD disk file“ 4) Browse and select the image file(iso or what ever format) from the … Read more