Cfrtjryk

I have a text file (created by a script) which contains only numbers in a single line like "5 17 42 2 87 33". I want to check every number with 50 (example), and if any of those numbers is greater than 50, I want to run another shell script.
I'm using a vumeter program, my purpose is to run a sound recognition program if noise level is high. So I just want to determine a threshold.

Using awk:

awk '{ for(i = 1; i <= NF; i++) if($i > 50) { system("bash /other/shell/script.sh") } }' file.txt

Using a bash script:

#!/bin/bash



file=/path/to/file.txt



for num in $(<"$file"); do

    if ((num>50)); then

        bash /other/shell/script.sh

    fi

done

This will loop through each number in file.txt and check if that number is greater than 50, then run the script you provide. However this may be an issue or unnecessary; If there are multiple numbers in your text file greater than 50 should you run your script multiple times?

As a parameter-accepting function and input as the hard-coded filename:

greaterthan() (

  threshold=$1

  set -- $(< input)

  for arg

  do

    if [ "$arg" -gt "$threshold" ]

    then

      echo execute other shell script

      break

    fi

  done

)

Source that in, or make it a script, and call it like greaterthan 50 or whatever number you like.

You can use dc :

dc -f lefile -e '

  [ c                                         # clear the stack

  ! xmessage "a number is greater than 50" &  # pop up a message

  ] sr

  [ 50 <r                                     # if a number > 50 execute macro r

  z 0 <t                                      # if stack not empty execute macro t

  ] st

  lt x

'

You could split the file into lines, then search for lines matching numbers greater than or equal to 50:

fmt -w1 | egrep -q '(ddd|[5-9]d)(..*)?' && sh other_script.sh

The first parenthesized clause in regexp looks for at least three digits, or two digits starting with a '5'. The second clause allows an option decimal point and any suffix.

Use the -q option to suppress normal output, because we only want the exit status.