How to start script and put standard input in one command?

Question

I have a console program which uses standard input and output.

For example I call : ./program_name and after that I enter input

I need to make this two actions in one command like: ./program_name 'my input string' (this command returns Abort trap: 6).

How to do that?

I haven't source code for the program.

chepner · Accepted Answer · 2015-09-28 18:25:36Z

up vote 9 down vote accepted

Use a here string

./program_name <<< 'my input string'

or a here document (longer, but standard):

./program_name <<EOF
my input string
EOF

chepner
2,329617

answered yesterday

Dani_l
49315

2

This is the better answer, since it doesn't start an additional process like the pipeline does. – chepner yesterday

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thrig · Answer 2 · 2015-09-28 21:09:01Z

up vote 4 down vote

echo my input string | ./program_name

Or, if you are a quotist:

echo "my input string" | ./program_name

Another handy tip is a subshell to collect output from multiple sources, for example:

( echo header; cat /etc/passwd; echo footer ) | ./program_name

answered yesterday

thrig
2,3077

2

I think it would be much more readable if you put my input string in quotes. – Elixir of Love yesterday

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2 Answers 2