Reading individual rows from a file and using values in another script

Question

I have a file (x.txt) with a single column containing a hundred values.

I want to input each of these values to an existing script I have such that my command on the terminal is:

script_name 228.71 245.58 253.71........... and so on.

I am trying to create a bash script such that each row is read automatically from the file and taken into the script. I have been trying this for a while now but could not get a solution.

Is there a way to do this?

please update the question with your coding attempts and the (wrong) output generated by your code — markp-fuso
– markp-fuso, Commented Oct 26, 2022 at 22:24
are you looking to store each value from the .txt file inside a list? — logan_9997
– logan_9997, Commented Oct 26, 2022 at 22:24
please confirm the structure of your input file ... one line with 100 values or 100 lines with one value per line? — markp-fuso
– markp-fuso, Commented Oct 26, 2022 at 22:27
Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. — Community
– Community Bot, Commented Oct 26, 2022 at 22:44

tdelaney · Accepted Answer · 2022-10-26 22:44:38Z

0

You could read the text file line by line into a list, stripping any newlines on the way. The subprocess.call call takes a list of the command to run plus any arguments. So create a new list with the values just read and the name of the command.

import sys
import subprocess

values = [line.strip() for line in open("x.txt")]
subprocess.call(["script_name"] + values)

answered Oct 26, 2022 at 22:44

tdelaney

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Bruno · Accepted Answer · 2022-10-26 23:25:39Z

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In pure Bash, you could use mapfile/readarray to have an array populated with each line of input file.

For example:

#!/usr/bin/env bash
CMDNAME="${0##*/}"
mapfile -t data < x.txt
printf "%s %s\n" "$CMDNAME" "${data[*]}"

Output with script named foo.sh :

$ ./foo.sh
foo.sh 228.71 245.58 253.71 482.72 616.73 756.74 834.72 858.62 934.61 944.60

answered Oct 26, 2022 at 23:25

Bruno

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J_H · Accepted Answer · 2022-10-26 23:28:29Z

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There's a standard utility for this.

$ cat x.txt | xargs script_name

Consult the man page for details. Possibly you'd like to adjust the -n value.

answered Oct 26, 2022 at 23:28

J_H

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stack0114106 · Accepted Answer · 2022-10-27 01:53:33Z

0

Using awk, you can concatenate them to a single line by making ORS=" "

awk 'BEGIN {ORS=" "} { print } ' x.txt

Copy the output to a variable and pass it to the script_name

answered Oct 27, 2022 at 1:53

stack0114106

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