Defining _GNU_SOURCE has nothing to do with license and everything to do with writing (non-)portable code. If you define _GNU_SOURCE, you will get: access to lots of nonstandard GNU/Linux extension functions access to traditional functions which were omitted from the POSIX standard (often for good reason, such as being replaced with better alternatives, or being … Read more
bash -n scriptname Perhaps an obvious caveat: this validates syntax but won’t check if your bash script tries to execute a command that isn’t in your path, like ech hello instead of echo hello.
From the manual: -N or –LINE-NUMBERS Causes a line number to be displayed at the beginning of each line in the display. You can also toggle line numbers without quitting less by typing -N. It is possible to toggle any of less’s command line options in this way.
You have several options to set up variables from outside your makefile: From environment – each environment variable is transformed into a makefile variable with the same name and value. You may also want to set -e option (aka –environments-override) on, and your environment variables will override assignments made into makefile (unless these assignments themselves … Read more