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With bash 4.2 and above, you can do:

${var::-1}

Example:

$ a=123
$ echo "${a::-1}"
12

With bash 4.2 and above, you can do:

${var::-1}

Example:

$ a=123
$ echo "${a::-1}"
12

Notice that for older bash ( for example, bash 3.2.5 on OS X), you should leave spaces between and after colons:

${var: : -1}

With bash, you can do:

${var::-1}

Example:

$ a=123
$ echo "${a::-1}"
12

With bash 4.2 and above, you can do:

${var::-1}

Example:

$ a=123
$ echo "${a::-1}"
12

With bash, you can do:

${var::-1}

Example:

$ a=123
$ echo ${a::-1}
12

With bash, you can do:

${var::-1}

Example:

$ a=123
$ echo "${a::-1}"
12