command-line-arguments

Parsing boolean values with argparse

I think a more canonical way to do this is via: command –feature and command –no-feature argparse supports this version nicely: Python 3.9+: parser.add_argument(‘–feature’, action=argparse.BooleanOptionalAction) Python < 3.9: parser.add_argument(‘–feature’, action=’store_true’) parser.add_argument(‘–no-feature’, dest=”feature”, action=’store_false’) parser.set_defaults(feature=True) Of course, if you really want the –arg <True|False> version, you could pass ast.literal_eval as the “type”, or a user defined … Read more

Propagate all arguments in a bash shell script

Use “$@” instead of plain $@ if you actually wish your parameters to be passed the same. Observe: $ cat no_quotes.sh #!/bin/bash echo_args.sh $@ $ cat quotes.sh #!/bin/bash echo_args.sh “$@” $ cat echo_args.sh #!/bin/bash echo Received: $1 echo Received: $2 echo Received: $3 echo Received: $4 $ ./no_quotes.sh first second Received: first Received: second Received: … Read more

Passing additional variables from command line to make

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

Parsing command-line arguments in C

To my knowledge, the three most popular ways how to parse command line arguments in C are: Getopt (#include <unistd.h> from the POSIX C Library), which can solve simple argument parsing tasks. If you’re a bit familiar with bash, the getopt built-in of bash is based on Getopt from the GNU libc. Argp (#include <argp.h> … Read more