Shell Programming and Scripting

output.txt

Freq = 1900
L = 159

F=$(awk 'BEGIN {}/Freq/ {split ($2,a);depth=a[1]};printf "%d\t, depth/' output.txt)
echo "$F"

$ F=$(sed -n "/Freq *=/ s/.*= *//p" output.txt)

$ echo $F
1900

$ cat Vars
while read LHS EQ RHS; do
  case "$LHS" in
    Freq|L) eval $LHS=\"$RHS\";;
  esac
done < output.txt

echo Freq is $Freq
echo L is $L

$ ./Vars
Freq is 1900
L is 159

while read LHS EQ RHS; do
  case "$LHS" in
    Freq) F="$RHS";;
    L) Len="$RHS";;
    ... etc
  esac
done < output.txt

$ while read S; do eval "${S// /}"; done <output.txt
$ echo "Freq='$Freq' - L='$L'"
Freq='1900' - L='159'