| 1 | This file is let.def, from which is created let.c.
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| 2 | It implements the builtin "let" in Bash.
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| 3 |
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| 4 | Copyright (C) 1987-2002 Free Software Foundation, Inc.
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| 5 |
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| 6 | This file is part of GNU Bash, the Bourne Again SHell.
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| 7 |
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| 8 | Bash is free software; you can redistribute it and/or modify it under
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| 9 | the terms of the GNU General Public License as published by the Free
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| 10 | Software Foundation; either version 2, or (at your option) any later
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| 11 | version.
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| 12 |
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| 13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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| 14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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| 16 | for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License along
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| 19 | with Bash; see the file COPYING. If not, write to the Free Software
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| 20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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| 21 |
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| 22 | $BUILTIN let
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| 23 | $FUNCTION let_builtin
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| 24 | $PRODUCES let.c
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| 25 | $SHORT_DOC let arg [arg ...]
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| 26 | Each ARG is an arithmetic expression to be evaluated. Evaluation
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| 27 | is done in fixed-width integers with no check for overflow, though
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| 28 | division by 0 is trapped and flagged as an error. The following
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| 29 | list of operators is grouped into levels of equal-precedence operators.
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| 30 | The levels are listed in order of decreasing precedence.
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| 31 |
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| 32 | id++, id-- variable post-increment, post-decrement
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| 33 | ++id, --id variable pre-increment, pre-decrement
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| 34 | -, + unary minus, plus
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| 35 | !, ~ logical and bitwise negation
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| 36 | ** exponentiation
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| 37 | *, /, % multiplication, division, remainder
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| 38 | +, - addition, subtraction
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| 39 | <<, >> left and right bitwise shifts
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| 40 | <=, >=, <, > comparison
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| 41 | ==, != equality, inequality
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| 42 | & bitwise AND
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| 43 | ^ bitwise XOR
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| 44 | | bitwise OR
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| 45 | && logical AND
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| 46 | || logical OR
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