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

What’s the best way to parse command line arguments? [duplicate]

argparse is the way to go. Here is a short summary of how to use it: 1) Initialize import argparse # Instantiate the parser parser = argparse.ArgumentParser(description=’Optional app description’) 2) Add Arguments # Required positional argument parser.add_argument(‘pos_arg’, type=int, help=’A required integer positional argument’) # Optional positional argument parser.add_argument(‘opt_pos_arg’, type=int, nargs=”?”, help=’An optional integer positional argument’) … Read more

Is there a “standard” format for command line/shell help text?

Typically, your help output should include: Description of what the app does Usage syntax, which: Uses [options] to indicate where the options go arg_name for a required, singular arg [arg_name] for an optional, singular arg arg_name… for a required arg of which there can be many (this is rare) [arg_name…] for an arg for which … Read more

How to export and import a .sql file from command line with options? [duplicate]

Type the following command to import sql data file: $ mysql -u username -p -h localhost DATA-BASE-NAME < data.sql In this example, import ‘data.sql’ file into ‘blog’ database using vivek as username: $ mysql -u vivek -p -h localhost blog < data.sql If you have a dedicated database server, replace localhost hostname with with actual … Read more

Downloading MySQL dump from command line

You can accomplish this using the mysqldump command-line function. For example: If it’s an entire DB, then: $ mysqldump -u [uname] -p db_name > db_backup.sql If it’s all DBs, then: $ mysqldump -u [uname] -p –all-databases > all_db_backup.sql If it’s specific tables within a DB, then: $ mysqldump -u [uname] -p db_name table1 table2 > … Read more

What is “String args[]”? parameter in main method Java

In Java args contains the supplied command-line arguments as an array of String objects. In other words, if you run your program in your terminal as : C:/ java MyProgram one two then args will contain [“one”, “two”]. If you wanted to output the contents of args, you can just loop through them like this… … Read more

Python argparse command line flags without arguments

As you have it, the argument w is expecting a value after -w on the command line. If you are just looking to flip a switch by setting a variable True or False, have a look here (specifically store_true and store_false) import argparse parser = argparse.ArgumentParser() parser.add_argument(‘-w’, action=’store_true’) where action=’store_true’ implies default=False. Conversely, you could … Read more