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Trying to write a script which will read what a user has imput... I know it's basic but im stuck on the first if..
echo "Please enter yes or no (y/n)?"
read string
if [ $string = "y" -o "n" ]
then
echo "User selected $string"
else
echo "You didn't enter y/n !!!"
fi
I would like it to be if [ $backup = "y" or "n" ]
Any ideas?
399
To check if two strings are equal in bash scripting, use bash if statement and double equal to== operator. To check if two strings are not equal in bash scripting, use bash if statement and not equal to!= operator.
A regular expression matching sign, the =~ operator, is used to identify regular expressions. Perl has a similar operator for regular expression corresponding, which stimulated this operator.
Details. Use == operator with bash if statement to check if two strings are equal. You can also use != to check if two string are not equal.
You can check the equality and inequality of two strings in bash by using if statement. “==” is used to check equality and “!= ” is used to check inequality of the strings. You can partially compare the values of two strings also in bash.
Use this syntax in bash :
if [ "a string" = "another one" ] ; then
# Whatever
fi
For multiple conditional statements such as OR, use:
if [ "a string" = "another one" ] || [ "$foo" = "bar" ] ; then
# Whatever
fi
bash also supports the non-standard [[ ... ]] expression, which can process a compound comparison using a single command, rather than 2 [ commands:
if [[ "a string" = "another one" || $foo = "bar" ]]; then
# Whatever
fi
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