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expr: update help to markdown syntax

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Terts Diepraam 2022-11-18 16:01:09 +01:00 • committed by Sylvestre Ledru
parent e155a5ea6d
commit bcf3b852c6
1 changed files with 32 additions and 30 deletions
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20
src/uu/expr/expr.md
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@ -2,7 +2,7 @@
## About
Print the value of EXPRESSION to standard output
Print the value of `EXPRESSION` to standard output
## Usage
```
@ -12,8 +12,10 @@ expr [OPTIONS]
## After help
Print the value of EXPRESSION to standard output. A blank line below
separates increasing precedence groups. EXPRESSION may be:
Print the value of `EXPRESSION` to standard output. A blank line below
separates increasing precedence groups.
`EXPRESSION` may be:
ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2
@ -49,11 +51,11 @@ Comparisons are arithmetic if both ARGs are numbers, else lexicographical.
Pattern matches return the string matched between \( and \) or null; if
\( and \) are not used, they return the number of characters matched or 0.
Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null
or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred.
Exit status is `0` if `EXPRESSION` is neither null nor `0`, `1` if `EXPRESSION` is null
or `0`, `2` if `EXPRESSION` is syntactically invalid, and `3` if an error occurred.
Environment variables:
* EXPR_DEBUG_TOKENS=1 dump expression's tokens
* EXPR_DEBUG_RPN=1 dump expression represented in reverse polish notation
* EXPR_DEBUG_SYA_STEP=1 dump each parser step
* EXPR_DEBUG_AST=1 dump expression represented abstract syntax tree"
- `EXPR_DEBUG_TOKENS=1`: dump expression's tokens
- `EXPR_DEBUG_RPN=1`: dump expression represented in reverse polish notation
- `EXPR_DEBUG_SYA_STEP=1`: dump each parser step
- `EXPR_DEBUG_AST=1`: dump expression represented abstract syntax tree