FAQ

Question:  How can I install all the schedule jobs from a text file to the crontab? Also, can I remove all the cron jobs at once instead of removing the individual lines from the crontab? Answer: You can install, edit and remove crontab in batch mode as examples below. Also, refer to our 15 crontab [...]

You may be using bc command in command line for calculations. It can also be used for batch mode calculations as explained below. 1. Calculation using Single command $ echo "4+10" | bc 14 2. Calculation using Multiple commands $ echo "obase=15;5+9" | bc E 3. Using previous results in the current operation In the [...]

Question: I would like to understand the basics of how to write and execute a Fortran program on Linux OS. Can you explain it with a simple example? Answer: In this article, let us review very quickly how to write a basic Hello World Fortran program and execute *.f program on Linux or Unix OS. [...]

Question: When debugging an issue on Ubuntu, I typically go to the command line to view the log file. Are there any GUI log file viewers available for Ubuntu? Answer: Ubuntu comes with an inbuilt system log file viewer. Launching System Log Viewer Click on System -> Administration -> Log File Viewer, to launch the [...]

Question: When I execute ping command from the command line, it keeps sending the packets until I hit CTRL-C to terminate the ping command output. How can I execute ping command only for N number of packets and terminate the output automatically? Answer: Use ping option -c to specify the number of packets. After sending [...]

Question: I’m trying to capture the output of the top command into a file. When I execute top > output.txt, the output.txt file contains lot of junk characters. What is the best method to capture the output of the top command into a readable text file? Answer: Use the top command batch mode operation option [...]

Question: I would like to understand the basics of how to write and execute a small talk program on Linux OS. Can you explain it with a simple example? Answer: In this article, let us review very quickly how to write a basic Hello World SmallTalk program and execute *.st program on Linux or Unix [...]