I want this to work:
./search.sh < inputFile.json
and
./search.sh < inputFile2.json
That will output something different depending on the file. I would then like to do this:
(./search.sh < inputFile.json) > results.json
I'm sure that syntax is wrong. Is anyone able to put me in the right direction? I can't find how to do this in my ruby script (I'm using .sh but it's ruby).
You have multiple options.
One option is to read from stdin. You can for example do in search.sh
#!/usr/bin/env ruby
input = $stdin.read
puts "here's the input i got:"
puts input
Suppose we have a file foo.txt which looks like this
foo
bar
baz
then you can use it with a unix pipe
~$ ./search.sh < foo.txt
here's the input i got:
foo
bar
baz
which is equivalent to
~$ cat foo.txt | ./search.sh
here's the input i got:
foo
bar
baz
although this is useless use of cat and just meant to serve demonstration purposes. You can not only pipe files but also output from other commands
~$ echo "hello, world!" | ./search.sh
here's the input i got:
hello, world!
if you want to redirect the output to another file, do
~$ ./search.sh < foo.txt > bar.txt
~$ cat bar.txt
here's the input i got:
foo
bar
baz
Another way is to just pass the file name as argument and read the file directly from Ruby:
#!/usr/bin/env ruby
file = ARGV.first
input = File.read(file)
puts "here's the input i got:"
puts input
Usage:
~$ ./search.sh foo.txt
here's the input i got:
asfdg
sdf
sda
f
sdfg
fsd
and again to redirect the output use >
~$ ./search.sh foo.txt > bar.txt
I'm assuming the content of the input files will be different and you will have some logic to determine that. You can actually just read that file input as if it was entered as text by the user and do whatever you need to do with it.
Example:
test.rb
puts gets.chomp
testfile
test
Terminal
$ ruby test.rb < testfile
$ test
