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I have a file that looks like logfiles.txt :

log1 ads.log
log2 bdfds.log
log4 cdrfs.log

I want to loop through the file:

for each lines do:
    echo $logname ;
    clear $logfilename; 
done

I know how to do the actions, but how do I loop inside the line for each parameter .

Thanks

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6
  • 1
    Does this answer your question? while read loop Commented May 20, 2020 at 10:38
  • this can be helpful stackoverflow.com/questions/1521462/… Commented May 20, 2020 at 10:39
  • 1
    What do you mean with clear $logfilename? Commented May 20, 2020 at 11:09
  • clear is function I use - Commented May 20, 2020 at 11:22
  • 1
    Then please edit your question so that all necessary information is readily available for contributors. Commented May 20, 2020 at 11:36

1 Answer 1

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1

Basically

while IFS=" " read -r logname logfile
do
    if [[ ! -z $logfile ]]
    then
        echo "$logname"
        clear "$logfile"
    fi
done < logfiles.txt
  • The IFS=" " statement sets the field separator to whitespace, so the tokens are interpreted as space-separated.
  • The if part guards against empty lines (which seem to be present, looking at your sample input) and those missing the second field.
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2
  • I think it's about what I look for, and for this to itterate through all lines ? a simple for on the file ? Commented May 20, 2020 at 11:36
  • 1
    I'm not sure if I correctly understand your question, but this will read all lines of logfiles.txt, extract the two strings, and perform the actions you mentioned in the question. If you are new to shell scripting, may I recommend looking at GreyCat and Lhunath's Bash Guide and using shellcheck for debugging your scripts. Commented May 20, 2020 at 11:38

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