![]() We can use this id to view the output or stop the program: $ pm2 logs 0 We see that pm2 assigns an ID to every program started. Starting /home/kd/tinkering/test.py in fork_mode (1 instance) While pm2 was mainly built to run nodejs programs, it can handle others, such as python programs: $ pm2 start test.py Once the program begins, we can view the current status by running pm2 status: $ pm2 status Current process list is not synchronized with saved list. │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ Starting /home/kd/tinkering/test.js in fork_mode (1 instance) Spawning PM2 daemon with pm2_home=/home/kd/.pm2 We can start a nodejs program with pm2 using pm2 start: $ pm2 start test.js As a result, we only get notified of the PID on our terminal initially and then only when the process has exited. In this case, we redirected the output and error streams to /dev/null, and the output we saw earlier is now suppressed. + Terminated gedit > /dev/null 2> /dev/null To avoid that, we can redirect the output to another location, say /dev/null: $ gedit 1>/dev/null 2>/dev/null & We also see that the output from the gedit command is still printed on this terminal. When we run the kill command on its PID, the program exits. Gedit is a GUI program, and it opens up on the desktop while leaving the terminal free to run other commands. (gedit:968967): GtkSourceView-WARNING **: 16:15:38.175: no color named 'white'įrom the above, we see that appending an ampersand to the gedit command sends it to the background and prints its PID, 968967. Script.We can start a command in the background by appending “ &” to the end of the command: $ gedit & The next thing we have to do is give the shell permission to execute our ![]() Programmers to explain what is going on so that others can figure it out. As our scripts becomeīigger and more complicated, comments become vital. Languages such as Perl, awk, tcl, Tk, and python also It is a special construct, calledĪ shebang, given to the system indicating what program is to be used to The first line of the script is important. Forms of this program appear inĪlmost every introductory programming book. This is a traditional "Hello World" program. Let's fire up our text editor and type in our first script as follows:Ĭlever readers will have figured out how to copy and paste the text into the It has syntax highlighting, a helpful feature for programmers and gedit is easy to use and contains enough features to Gedit is the editor supplied with the GNOMEĭesktop environment. nano is recommended forįirst-time users who need a command line editor. nano is very easy to use but is very short on featuresĬompared to vim and emacs. It should be noted that vi and Emacs fans fight bitter religious wars over Emacs contains (or can be made to contain) every feature everĬonceived of for a text editor. The true giant in the world of text editors is Emacs originally vim is a remarkable editor and well worth taking the Version of vi called vim is provided in place of vi. Learning vi is a Unix rite of passage, since it is universallyĪvailable on Unix-like systems. On the bright side, vi is powerful, lightweight, and fast. The granddaddy of Unix text editors, vi, is
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