30 апр. 2009 г. · One approach is to use a regular expression, like so: re='^[0-9]+$' if ! [[ $yournumber =~ $re ]] ; then echo "error: Not a number" >&2; exit 1 fi bash - Test whether string is a valid integer Bash if variable is an integer How to check if a variable is set in Bash Check whether input is number or not in bash Другие результаты с сайта stackoverflow.com

2 янв. 2023 г. · How to Check if a Variable Is a Number in Bash · Using regular expression with equal tilde operator (=~) · Check using the switch case.

18 мар. 2024 г. · In this tutorial, we've explained how to check if a variable is a number in Bash. The proposed solutions all rely on the use of regular expressions.

30 июн. 2023 г. · You can use the int() to check if a number is an integer or not using awk. The int() function of awk returns the integer part of a number. In ...

30 апр. 2009 г. · Here's a 100% fool-proof (and well-readable) line for you: [[ $1 =~ "^[0-9]+$" ]] && { echo "number"; exit 0; } || { echo "not a number"; exit 1; }

16 дек. 2013 г. · As David points out below, you must use "-eq" to test numeric values. You might also want to check for a blank variable to avoid errors; if [ !

22 авг. 2014 г. · Use -eq operator of test command: read scale if ! [ "$scale" -eq "$scale" ] 2> /dev/null then echo "Sorry integers only" fi It not only works in bash but also ... bash - Testing for Zero or Positive Whole Number How to check if variable is integer (avoid problem with spaces ... Другие результаты с сайта unix.stackexchange.com

18 мар. 2024 г. · In this tutorial, we'll learn about these operators and how to compare variables with numbers in Bash.

A simple solution would be (for positive integers) Code: echo $X | egrep '^[0-9]+$' >/dev/null 2>&1 if [ "$?" -eq "0" ]; then echo "Postive integer here

12 мая 2009 г. · You can test to see if a variable is specifically unset (as distinct from an empty string): if [[ -z ${variable+x} ]] where the "x" is arbitrary.