bash while loop with mixed condition

Question

I'm not meaning multiple conditions, well it's also but mixed from that:

while [[ read line ] && [ "$GoodURL" == "false" ]]

What is the correct form for that? It's a while loop that runs on a text file line by line, and I want to stop it with that $GoodURL type of boolean, please help. Thanks.

sehe · Accepted Answer · 2011-11-22 00:55:37Z

6

while read line && [[ "$GoodURL" == "false" ]]
do 
    echo $line; 
done

In case you want to read from a file/pipe, be sure to use indirection or you will get funny results (due the while loop executing in a subshell and not actually using the same environmen as the surrounding shell)

while read line && [[ "$GoodURL" == "false" ]]
do 
    echo $line; 
done < input.txt

answered Nov 22, 2011 at 0:55

sehe

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3 Comments

Khurshid Alam Over a year ago

This doesn't work if I check if a process is still running. For example, while read LINE && [[ pgrep "gnote" > /dev/null ]] fails. pgrep gedit checks if a application is still running.` Is there any other way I can make it work

Khurshid Alam Over a year ago

Ah . Sorry. while read LINE && pgrep "gnote" > /dev/null. This fails as well.

sehe Over a year ago

@KhurshidAlam Works like a charm for me. Of course, pgrep runs /after/ read and and exiting gnote does not interrupt that. You need to ask your own question.

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