| 1 | ---
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| 2 | in_progress: yes
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| 3 | body_css_class: width40 help-body
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| 4 | default_highlighter: oils-sh
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| 5 | preserve_anchor_case: yes
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| 6 | ---
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| 7 |
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| 8 | Word Language
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| 9 | ===
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| 10 |
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| 11 | This chapter in the [Oils Reference](index.html) describes the word language
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| 12 | for OSH and YSH.
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| 13 |
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| 14 | <div id="toc">
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| 15 | </div>
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| 16 |
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| 17 | <h2 id="expression">Expressions to Words</h2>
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| 18 |
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| 19 | ### expr-sub
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| 20 |
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| 21 | ### expr-splice
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| 22 |
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| 23 | ### var-splice
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| 24 |
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| 25 | <h2 id="formatting">Formatting Typed Data as Strings</h2>
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| 26 |
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| 27 | ### ysh-printf
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| 28 |
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| 29 | ### ysh-format
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| 30 |
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| 31 |
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| 32 | ## Quotes
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| 33 |
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| 34 | ### osh-string
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| 35 |
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| 36 | - Single quotes
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| 37 | - Double Quotes
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| 38 | - C-style strings: `$'\n'`
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| 39 |
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| 40 | TODO: elaborate
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| 41 |
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| 42 | ### ysh-string
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| 43 |
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| 44 | YSH strings in the word language are the same as in the expression language.
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| 45 |
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| 46 | See [ysh-string in chap-expr-lang](chap-expr-lang.html#ysh-string).
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| 47 |
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| 48 | ### triple-quoted
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| 49 |
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| 50 | Triple-quoted in the word language are the same as in the expression language.
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| 51 |
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| 52 | See [triple-quoted in chap-expr-lang](chap-expr-lang.html#triple-quoted).
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| 53 |
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| 54 | ### tagged-str
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| 55 |
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| 56 | Not done.
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| 57 |
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| 58 | ## Substitutions
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| 59 |
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| 60 | ### com-sub
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| 61 |
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| 62 | Evaluates to the stdout of a command. If a trailing newline is returned, it's
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| 63 | stripped:
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| 64 |
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| 65 | $ hostname
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| 66 | example.com
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| 67 |
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| 68 | $ x=$(hostname)
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| 69 | $ echo $x
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| 70 | example.com
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| 71 |
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| 72 | ### var-sub
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| 73 |
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| 74 | Evaluates to the value of a variable:
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| 75 |
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| 76 | $ x=X
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| 77 | $ echo $x ${x}
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| 78 | X X
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| 79 |
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| 80 | ### arith-sub
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| 81 |
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| 82 | Shell has C-style arithmetic:
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| 83 |
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| 84 | $ echo $(( 1 + 2*3 ))
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| 85 | 7
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| 86 |
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| 87 | ### tilde-sub
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| 88 |
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| 89 | Used as a shortcut for a user's home directory:
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| 90 |
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| 91 | ~/src # my home dir
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| 92 | ~bob/src # user bob's home dir
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| 93 |
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| 94 | ## Var Ops
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| 95 |
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| 96 | ### op-test
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| 97 |
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| 98 | ### op-strip
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| 99 |
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| 100 | ### op-replace
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| 101 |
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| 102 | ### op-index
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| 103 |
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| 104 | ${a[i+1]}
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| 105 |
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| 106 | ### op-slice
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| 107 |
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| 108 | ### op-format
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| 109 |
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| 110 | ${x@P} evaluates x as a prompt string, e.g. the string that would be printed if
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| 111 | PS1=$x.
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| 112 |
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