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Re: [Help-bash] Readig multiple null-separated values

From: František Kučera
Subject: Re: [Help-bash] Readig multiple null-separated values
Date: Sat, 11 Jan 2020 20:10:48 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2

Dne 27. 07. 19 v 10:58 František Kučera napsal(a):
> To read a record in a cycle I wanted to use the read command with proper 
> parameters first, but it seemed impossible and I ended with a custom function 
> which work as I need:
> read_nullbyte() { for v in "$@"; do export "$v"; read -r -d '' "$v"; done }
> Usage example:
> printf 'a\0aaa\0b\0bbb\0c\0ccc' | while read_nullbyte a1 a2; do echo a1=$a1 
> a2=$a2; done 

I found a bug in this function. It should be:

read_nullbyte() { local IFS=; for v in "$@"; do export "$v"; read -r -d '' 
"$v"; done }

because with default IFS it truncates whitespace from the beginning and end of 
the value. Test:

printf 'a\0 b b \0c' | while read_nullbyte "x"; do echo ">$x<"; done


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