The following method, removes the last character from a bash variable by using a regular expression that matches any character.
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VAR=${VAR%?};
The functionality ${string%substring} deletes shortest match of $substring from the back of $string.
The question mark ? matches zero or one of the previous regular expression. It is generally used for matching single characters.
So by using ? as our $substring we instruct bash to match any character at the end of the variable and remove it.
The following method, removes the first character from a bash variable by using a regular expression that matches any character. The functionality ${string#substring} deletes shortest match of $substring from the front of $string. The question mark ? matches zero or one of the previous regular expression. It is generally used…
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A variable in bash (and any POSIX-compatible shell) will be in one of the three following states: unset set but empty set and not empty Variables in bash do not have data types. A variable can contain a number, a character, a string of characters or the empty string. Assigning…
