How can I read each line from a file into one variable for the last field, and another variable for the other fields?

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up vote
1
down vote

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How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?



For example, I have a file:



hello world! 10s
It is a good day. 4m
...


I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:



while read line 
do
 ... # split $line into $message and $interval
 myprogram "$message" "$interval"
done < "$inputfile"





bash text-processing







share|improve this question























  • Will the interval ever contain white space?
    – Jesse_b
    7 hours ago










  • Thanks. The time interval will be used as argument to sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.
    – Tim
    7 hours ago










  • Obligatory unix.stackexchange.com/q/169716/117549
    – Jeff Schaller
    7 hours ago










  • @JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
    – Tim
    6 hours ago











  • It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
    – Jeff Schaller
    6 hours ago














up vote
1
down vote

favorite












How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?



For example, I have a file:



hello world! 10s
It is a good day. 4m
...


I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:



while read line 
do
 ... # split $line into $message and $interval
 myprogram "$message" "$interval"
done < "$inputfile"





bash text-processing







share|improve this question























  • Will the interval ever contain white space?
    – Jesse_b
    7 hours ago










  • Thanks. The time interval will be used as argument to sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.
    – Tim
    7 hours ago










  • Obligatory unix.stackexchange.com/q/169716/117549
    – Jeff Schaller
    7 hours ago










  • @JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
    – Tim
    6 hours ago











  • It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
    – Jeff Schaller
    6 hours ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?



For example, I have a file:



hello world! 10s
It is a good day. 4m
...


I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:



while read line 
do
 ... # split $line into $message and $interval
 myprogram "$message" "$interval"
done < "$inputfile"





bash text-processing







share|improve this question















How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?



For example, I have a file:



hello world! 10s
It is a good day. 4m
...


I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:



while read line 
do
 ... # split $line into $message and $interval
 myprogram "$message" "$interval"
done < "$inputfile"





bash text-processing




bash text-processing






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 4 mins ago









K7AAY

236319




236319










asked 8 hours ago









Tim

24.7k70239429




24.7k70239429











  • Will the interval ever contain white space?
    – Jesse_b
    7 hours ago










  • Thanks. The time interval will be used as argument to sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.
    – Tim
    7 hours ago










  • Obligatory unix.stackexchange.com/q/169716/117549
    – Jeff Schaller
    7 hours ago










  • @JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
    – Tim
    6 hours ago











  • It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
    – Jeff Schaller
    6 hours ago
















  • Will the interval ever contain white space?
    – Jesse_b
    7 hours ago










  • Thanks. The time interval will be used as argument to sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.
    – Tim
    7 hours ago










  • Obligatory unix.stackexchange.com/q/169716/117549
    – Jeff Schaller
    7 hours ago










  • @JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
    – Tim
    6 hours ago











  • It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
    – Jeff Schaller
    6 hours ago















Will the interval ever contain white space?
– Jesse_b
7 hours ago




Will the interval ever contain white space?
– Jesse_b
7 hours ago












Thanks. The time interval will be used as argument to sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.
– Tim
7 hours ago




Thanks. The time interval will be used as argument to sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.
– Tim
7 hours ago












Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago




Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago












@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago





@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago













It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago




It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago










1 Answer
1






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oldest

votes

















up vote
3
down vote



accepted










As long as the interval contains no whitespace this should work:



#!/bin/bash

input=/path/to/input

while read -r line; do
 message=$line% *
 interval=$line##* 
 echo "$message"
 sleep "$interval"
done < "$input"


$line% * Will strip everything after the last space character



$line##* Will strip everything before the last space character






share|improve this answer




















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    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    3
    down vote



    accepted










    As long as the interval contains no whitespace this should work:



    #!/bin/bash

    input=/path/to/input

    while read -r line; do
     message=$line% *
     interval=$line##* 
     echo "$message"
     sleep "$interval"
    done < "$input"


    $line% * Will strip everything after the last space character



    $line##* Will strip everything before the last space character






    share|improve this answer
























      up vote
      3
      down vote



      accepted










      As long as the interval contains no whitespace this should work:



      #!/bin/bash

      input=/path/to/input

      while read -r line; do
       message=$line% *
       interval=$line##* 
       echo "$message"
       sleep "$interval"
      done < "$input"


      $line% * Will strip everything after the last space character



      $line##* Will strip everything before the last space character






      share|improve this answer






















        up vote
        3
        down vote



        accepted







        up vote
        3
        down vote



        accepted






        As long as the interval contains no whitespace this should work:



        #!/bin/bash

        input=/path/to/input

        while read -r line; do
         message=$line% *
         interval=$line##* 
         echo "$message"
         sleep "$interval"
        done < "$input"


        $line% * Will strip everything after the last space character



        $line##* Will strip everything before the last space character






        share|improve this answer












        As long as the interval contains no whitespace this should work:



        #!/bin/bash

        input=/path/to/input

        while read -r line; do
         message=$line% *
         interval=$line##* 
         echo "$message"
         sleep "$interval"
        done < "$input"


        $line% * Will strip everything after the last space character



        $line##* Will strip everything before the last space character







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 7 hours ago









        Jesse_b

        10.6k22661




        10.6k22661



























             

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