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  1. #!/bin/bash
  2.  
  3. cdIs_num() { 
  4.   local re='^[+-]?[0-9]+([.][0-9]+)?$';
  5.   [[ $1 =~ $re ]]
  6. }
  7.  
  8. is_num() { 
  9.   local chk=${1#[+-]};
  10.   chk=${chk/.}
  11.   [ "$chk" ] && [ -z "${chk//[0-9]}" ]
  12. }
  13.  
  14. casenum () {
  15.   case ${1#[-+]} in
  16.    '' | *[!0-9.]* | *.*.*) return 1;;
  17.    *) return 0;;
  18.   esac
  19. }
  20.  
  21. for fun in is_num cdIs_num casenum; do
  22.   echo "** $fun **" >&2
  23.   time for i in {1..10000};do "$fun" +3.14159265; done
  24. done
Success #stdin #stdout #stderr 1.13s 6808KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
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** is_num **

real	0m0.326s
user	0m0.321s
sys	0m0.004s
** cdIs_num **

real	0m0.656s
user	0m0.629s
sys	0m0.000s
** casenum **

real	0m0.168s
user	0m0.167s
sys	0m0.000s
https://ideone.com/AVvMOU
https://stackoverflow.com/a/61835747/874188
language:
Bash (bash 5.0.3)
created:
2 years ago
visibility:
public

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