I have a txt in my folder named parameters.txt which contains
PP1 20 30 40 60
PP2 0 0 0 0
I'd like to use awk to read the different parameters depending on the value of the first text field in each line. At the moment, if I run
src_dir='/PP1/'
awk "$src_dir" '{ print $2 }' parameters.txt
I correctly get
20
I would simply like to store that 20 into a variable and to export the variable itself.
Thanks in advance!
If you want to save the output, do var=$(awk expression):
result=$(awk -v value=$src_dir '($1==value) { print $2 }' parameters.txt)
You can make your command more general giving awk the variable with the -v syntax:
$ var="PP1"
$ awk -v v=$var '($1==v) { print $2 }' a
20
$ var="PP2"
$ awk -v v=$var '($1==v) { print $2 }' a
0
src_dir="PP1"? Otherwise, does this work to you? --> result=$(awk -v value="PP1" '($1==value) { print $2 }' parameters.txt)?You don't really need awk for that. You can do it in bash.
$ src_dir="PP1"
$ while read -r pattern columns ; do
set - $columns
if [[ $pattern =~ $src_dir ]]; then
variable=$2
fi
done < parameters.txt
shell_pattern=PP1
output_var=$(awk -v patt=$shell_pattern '$0 ~ patt {print $2}' file)
Note that $output_var may contain more than one value if the pattern matches more than one line. If you're only interested in the first value, then have the awk program exit after printing .
