Setting default input for a bash script [duplicate]

Question

I am running a bash script that asks me a username and a password every time it executes.I want to keep the default as Arjun, *(^%567590ihyg. Is there a way to do that?

You really shouldn't edit your question to mean something entirely different. — Benjamin W.
– Benjamin W., Commented Aug 11, 2017 at 21:29
I edited the question.please check again.sry for the inconvenience — Ramesh
– Ramesh, Commented Aug 11, 2017 at 21:29
I'm voting to close this question as off-topic because it is not strictly about a programming issue. — Rob Kielty
– Rob Kielty, Commented Aug 11, 2017 at 23:24

Petr Skocik · Accepted Answer · 2017-08-11 21:37:50Z

1

Use can use:

: "${x:=the_default_value}"

to set x to the string the_default_value if it's empty or unset.

The syntax is POSIX and is documenting along with related syntaxes at http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02 .

In your case, you can attempt to read the variable or get it through a positional argument:

read name #or name=$1

and then default it if it is empty like so:

: "${name:=Arjun}"

edited Aug 11, 2017 at 21:37

answered Aug 11, 2017 at 21:32

Petr Skocik

60.6k7 gold badges105 silver badges165 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Ramesh Over a year ago

Thanks for the help sir:) and please upvote the ques

Petr Skocik Over a year ago

@Ramesh Please upvote the ans? :)

dimo414 Over a year ago

Please don't solicit upvotes - you'll get them if your question/answer merits it.

Collectives™ on Stack Overflow

Setting default input for a bash script [duplicate]

1 Answer 1

3 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Linked

Related