Although there are Python modules [1,2,3] specially suited for displaying text to the console in color, if you want a quick no-dependency method then you can use ANSI color codes directly. Here is an example of printing a line in green, then red. print(“\033[0;32mOK this is green\033[00m”) print(“\033[0;31mERROR this is red\033[00m”) Additional color codes can … Python: printing in color using ANSI color codes
Shell parameter expansion provides various ways to manipulate strings, and a convenient way to succinctly express renaming a set of files. In its simplest form, parameter expansion is simply ${parameter}. But look at these examples: $ mystr=”TheQuickBrownFox.jpg” # chop off last 4 digits $ echo ${mystr:0:-4} TheQuickBrownFox # truncate end of string ‘.jpg’ $ echo … Bash: Renaming files using shell parameter expansion
If you are in the middle of a text processing pipeline, and need to insert a shell or environment variable into the output of awk, you can use the “-v” flag. Here are two files containing animal classifications: $ echo -e “shark=fish\ndolphin=mammal” > ocean.txt $ echo -e “dog=mammal\neagle=bird” > land.txt By passing the loop variable … Bash: Using shell or environment variables in awk output
In order to communicate with MongoDB using its default TCP protocol on port 27017, you will need a MongoDB client. There are many language bindings available, but in this article we’ll focus on the client available from the “mongodb-org-shell” Debian package.
If you have Bash console commands that you type out frequently, consider creating an alias. By simply adding a “.bash_aliases” files in your home directory, you can easily define shortcuts to frequent commands. For example, if you frequently list all the files in a directory reverse sorted by date, you may end up typing “ls … Ubuntu: Creating an alias for common commands under bash
Zabbix low-level discovery (LLD) provides a way to create an array of related items, triggers, or graphs without needing to know the exact number of entities up front. The easiest way to populate the keys of a discovery item is to add a “UserParameter” in zabbix_agentd.conf, and then the Zabbix agent will invokes a script which returns the set … Zabbix: LLD low-level discovery returning multiple values