Original: shell two integers comparison idea version, shell integer

Original: shell two integers comparison idea version, shell integer

The idea is to learn code creation. I like the logic rigor of the first few lines.

#! /Bin/bash
# Determine the size of two integers
Read-p "enter two integers a B:" a B
# Or use a = $1
[-Z "$ a"] | [-z "$ B"] & {
Echo "the number you entered is zero"
Exit 1
}
# Whether the input value is 0
Expr $ a + 10 &>/dev/null
RETUAL1 = $?
Expr $ B + 10 &>/dev/null
Retual = $?
# Judge whether the input value is an integer
Test $ RETUAL1-eq 0-a $ retual-eq 0 | {
Echo "the variable is not an integer and does not meet the requirements"
Exit
}
[$ A-lt $ B] & {
Echo "$ a <$ B"
Exit 3
}
[$ A-gt $ B] & {
Echo "$ a> $ B"
Exit 4
}
[$ A-eq $ B] & {
Echo "$ a = $ B"
Exit 5
}