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I'm new to bash so this should be pretty basic but I can't find it so far.

I am going to have an input

cat input_file | sh_file.sh output_file

I want to get the information from the input_file so that I can use the sh_file.sh to pass it on to a python file and do some manipulation and output it from python.

I know that if it was set up like

sh_file.sh input_file output_file

I could just use input_file=$1, output_file=$2 and pass those through to my python file but with the pipe I don't know how to store it in a variable.

  • What exactly is it that you want to store in a variable, the contents of the file, or the name of the file (or something else)? Also, how does the python file handle the input file? – Gordon Davisson Nov 19 '20 at 17:05
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Inside the shell script, do this:

data=$(cat)

that will use the cat command to read standard input and store the result in the $data variable.

Read about the $(...) syntax here: 3.5.4 Command Substitution

  • I thought this worked but it's actually only giving me the first word in my input. If I type cat filename it gives me the correct output, but for some reason using this cuts off all except for the first word – iamjane Nov 19 '20 at 18:37
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    Exactly how are you using the "$data" variable? I'm guessing that you are using the variable unquoted. – glenn jackman Nov 19 '20 at 19:47
  • That worked! Thank you! – iamjane Nov 19 '20 at 19:51

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