how to use variable from subshell in shell

Question

please could you help me how can I use value in variable number. This variable get value in while cycle and it is in subshell. So question is how can I use it in shell. number=0 #blablabla

cat $WEDI_RC | while read line
    do  
       number=$(echo $line | grep $1 | awk -F'[ ]' '{print $3}')
       echo "in cycle"
       echo $number
    done
       echo "after while"
       echo $number
       ((number++))
       echo $number
       echo $1 `date +"%T"` $number >>$WEDI_RC

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cdarke
– cdarke

2015-03-15 06:00:03 +00:00
Commented Mar 15, 2015 at 6:00 — cdarke
– cdarke, Commented Mar 15, 2015 at 6:00

gniourf_gniourf · Accepted Answer · 2015-03-14 22:33:34Z

1

This is because the pipe creates a subshell, which has it's own counting.

The question has surely be answered many times, so for the full explanation just the link to the bash FAQ:

http://mywiki.wooledge.org/BashFAQ/024

The usual workaround is to redirect input from the input file instead of piping it (and you'll even get rid of the useless use of cat):

while read -r line
do
    ...
done < "$WEDI_RC"
...

edited Mar 14, 2015 at 22:33

gniourf_gniourf

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answered Mar 14, 2015 at 21:48

nlu

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1 Comment

Tom Over a year ago

thank you, I have to rewrite last line to "done < $WEDI_RC" and now is everything working well.

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