let

Get help on Linux let Command.

Linux let command is use to evaluate arithmetic expressions on Linux system. The Linux let command is one of bash shell built in command. The command example below show how to get let command manual or help on Linux let command using shell command, this help show information on how to use the Linux let command, the let command options and the arguments that can be use with Linux let command.

Get Linux let command help

Execute help command and the name of Linux command that we want the help file, the example below we execute help command with -m option to get the help for let command using the manpage format.

[linux@fedora11 ~]$ help -m let

NAME

let - Evaluate arithmetic expressions.

SYNOPSIS

let arg [arg ...]

DESCRIPTION

Evaluate arithmetic expressions.

Evaluate each ARG as an arithmetic expression. Evaluation is done in

fixed-width integers with no check for overflow, though division by 0

is trapped and flagged as an error. The following list of operators is

grouped into levels of equal-precedence operators. The levels are listed

in order of decreasing precedence.

id++, id-- variable post-increment, post-decrement

++id, --id variable pre-increment, pre-decrement

-, + unary minus, plus

!, ~ logical and bitwise negation

** exponentiation

*, /, % multiplication, division, remainder

+, - addition, subtraction

<<, >> left and right bitwise shifts

<=, >=, <, > comparison

==, != equality, inequality

& bitwise AND

^ bitwise XOR

| bitwise OR

&& logical AND

|| logical OR

expr ? expr : expr

conditional operator

=, *=, /=, %=,

+=, -=, <<=, >>=,

&=, ^=, |= assignment

Shell variables are allowed as operands. The name of the variable

is replaced by its value (coerced to a fixed-width integer) within

an expression. The variable need not have its integer attribute

turned on to be used in an expression.

Operators are evaluated in order of precedence. Sub-expressions in

parentheses are evaluated first and may override the precedence

rules above.

Exit Status:

If the last ARG evaluates to 0, let returns 1; let returns 0 otherwise..

SEE ALSO

bash(1)

IMPLEMENTATION

GNU bash, version 4.0.16(1)-release (i386-redhat-linux-gnu)

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

[linux@fedora11 ~]$

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