bash multiple if statement inside loop is not working

Muhammad Rashid Published at Linux

19

Muhammad Rashid :

I am new to bash scripting, I have a file and i want to check each line but it is not working.

My bach script code

declare -a arr

for (( i=0; i<${len}; i++ ))
do
    if [[ ${arr[$i]} =~ ^[0-9]+$ ]]
    then
      echo ${arr[$i]}" numbr"
    
    else
        echo "No match"
     fi
done

Why only last line is match ? is there any space or line break issue ? suggest me some solution

glenn jackman :

Your file is saved in "DOS" format, with \r\n line endings.

To convert to "unix" format:

dos2unix file.txt
# or, if that's not installed
sed -i 's/\r$//' file.txt

tangentially, I find the POSIX character class can describe what you want to match:

[[ ${arr[$i]} =~ ^[[:digit:]]+$ ]] && echo "${arr[i]} numbr"
[[ ${arr[$i]} =~ ^[[:alpha:]]+$ ]] && echo "${arr[i]} ltr only"
[[ ${arr[$i]} =~ ^[[:alnum:]]+$ ]] && echo "${arr[i]} both"

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edited at2020-09-26

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