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let and typesetlet is an alternative to expr for doing mathematical calculations. It is part of the posix shell and is similiar to the C programming statement e.g. let $TOTAL=$TOTAL+1 will add one to $TOTALThis can be alternatively expressed as (( $TOTAL = $TOTAL + 1 )) To speed up the arithmetic calculation you can specify that $TOTAL is a number. This is done as follows: typset -i TOTAL=10 Another use of typeset is to emulate the substring function found in other languages. e.g. typeset -L4 var1="12345678" will set var1 to 1234 typeset -R4 var2="12345678" will set var2 to 5678 The string 12345678 can be replaced by a variable. |