unitproc/bkt-checkInt

   1 #!/bin/bash
   2 # Desc: Checks if arg is an integer
   3
   4 #==BEGIN Define script parameters==
   5 #===BEGIN Declare local script functions===
   6 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   7 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   8 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
   9 checkInt() {
  10     # Desc: Checks if arg is integer
  11     # Usage: checkInt arg
  12     # Input: arg: integer
  13     # Output: - return code 0 (if arg is integer)
  14     #         - return code 1 (if arg is not integer)
  15     # Example: if ! checkInt $arg; then echo "not int"; fi;
  16     # Version: 0.0.1
  17     local returnState
  18
  19     #===Process Arg===
  20     if [[ $# -ne 1 ]]; then
  21         die "ERROR:Invalid number of arguments:$#";
  22     fi;
  23
  24     RETEST1='^[0-9]+$'; # Regular Expression to test
  25     if [[ ! $1 =~ $RETEST1 ]] ; then
  26         returnState="false";
  27     else
  28         returnState="true";
  29     fi;
  30
  31     #===Determine function return code===
  32     if [ "$returnState" = "true" ]; then
  33         return 0;
  34     else
  35         return 1;
  36     fi;
  37 } # Checks if arg is integer
  38
  39 #===END Declare local script functions===
  40 #==END Define script parameters==
  41
  42 #==BEGIN test code==
  43 if checkInt 4; then yell "success"; fi;
  44 sleep 1;
  45 if checkInt "foo"; then yell "success"; else yell "fail"; fi;
  46 sleep 1;
  47 if checkInt "foo" "bar" "baz" 1; then yell "success"; else yell "fail"; fi;
  48 sleep 1;
  49 if checkInt; then yell "success"; else yell "fail"; fi;
  50 #==END test code==
  51
  52 # Author: Steven Baltakatei Sandoval
  53 # License: GPLv3+