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  1. #!/usr/bin/env bash
  2. set -x
  3.  
  4. space_re='^([[:digit:]]+) ?([kmg]b)$'
  5.  
  6. declare -A multipliers=(
  7.   [kb]=$(( 1024 ))
  8.   [mb]=$(( 1024 * 1024 ))
  9.   [gb]=$(( 1024 * 1024 * 1024 ))
  10. )
  11.  
  12. to_bytes() {
  13.   result=$1
  14.   if [[ $1 =~ $space_re ]] && { units=${BASH_REMATCH[2]}; [[ $units && ${multipliers[$units]} ]]; }; then
  15.     result=$(( ${BASH_REMATCH[1]} * ${multipliers[${BASH_REMATCH[2]}]} ))
  16.   elif (( $1 )); then
  17.     result=$(( $1 ))
  18.   else
  19.     echo "ERROR: $1 could not be parsed as a number" >&2
  20.     return 1
  21.   fi
  22.   echo "$result"
  23. }
  24.  
  25. Var1='25 mb'
  26. Var2='1 gb'
  27. if (( $(to_bytes "$Var1") > $(to_bytes "$Var2") )); then
  28.   echo "Var1 is larger than Var2"
  29. else
  30.   echo "Var1 is not larger than Var2"
  31. fi
  32.  
Success #stdin #stdout #stderr 0.01s 5424KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Var1 is not larger than Var2
stderr
copy 
+ space_re='^([[:digit:]]+) ?([kmg]b)$'
+ multipliers=([kb]=$(( 1024 )) [mb]=$(( 1024 * 1024 )) [gb]=$(( 1024 * 1024 * 1024 )))
+ declare -A multipliers
+ Var1='25 mb'
+ Var2='1 gb'
++ to_bytes '25 mb'
++ result='25 mb'
++ [[ 25 mb =~ ^([[:digit:]]+) ?([kmg]b)$ ]]
++ units=mb
++ [[ -n mb ]]
++ [[ -n 1048576 ]]
++ result=26214400
++ echo 26214400
++ to_bytes '1 gb'
++ result='1 gb'
++ [[ 1 gb =~ ^([[:digit:]]+) ?([kmg]b)$ ]]
++ units=gb
++ [[ -n gb ]]
++ [[ -n 1073741824 ]]
++ result=1073741824
++ echo 1073741824
+ ((  26214400 > 1073741824  ))
+ echo 'Var1 is not larger than Var2'
https://ideone.com/W1vXOk
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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