Bash Pipe – Can I Use Pipe Output as a Shell Script Argument?

argumentsbashlinuxpipeshell

Suppose I have a bash shell script called Myscript.sh that need one argument as input.

But I want the content of the text file called text.txt to be that argument.

I have tried this but it does not work:

cat text.txt | ./Myscript.sh

Is there a way to do this?

Best Answer

Command substitution.

./Myscript.sh "$(cat text.txt)"

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Bash – How to pipe AWK command output to Python as first argument

If you want to use a pipe, then your python script would have to read from stdin. Your script doesn't do that. Instead it expects a file name on the command line. This can be accomplished using a shell feature called process substitution to connect the two together:

script.py <(awk '{if ($4 == 1975) print $1,$2,$3}' input.txt)

<(...) denotes process substitution. What happens here is that the shell creates a file-like object that contains the output of the awk command. This file-like object even has a name. If you run the script, the output will see its name, passed to python as sys.argv[1], is something like:

/dev/fd/63

Best Answer

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Bash – How to pipe AWK command output to Python as first argument

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