shQuote
Quote Strings for Use in OS Shells

### Description

Applies quotation marks and escape characters to strings so that they may be safely passed to operating system shells.

### Usage

    shQuote(string, type = c("sh", "csh", "cmd"))

### Arguments

string | a vector of character strings.
type | the operating system shell type. Can be "sh", "csh" or "cmd". If this value is missing and the operating system is Windows, it is set to "cmd".

### Details

- If type is "cmd", then "\"" is added at the beginning and ending of string, and "\"" is replaced with "\"\"" by regular-expression matching.

- If type is "sh" or "csh", and if length(string)==0, then the empty string "" is returned.

- If type is "sh" or "csh", and if string contains no character "'", then "'" is added at the begining and ending of string.

- If type is "sh", special characters "\"$`\\" are escaped by adding "\\" in front of them and then "\"" is added at the beginning and end.

- If type is "csh", and if string does not contain special characters "$`", escape characters "!\\" by adding "\\" in front of them and then "\"" is added at the beginning and end.

- If type is "csh", and if string does contain special characters "$`", replace characters "'" with "'\"'\"'" and then "'" is added at the beginning and end.

Value
returns the quoted string.
Examples

    shQuote(getwd())
    shQuote('foo/bar.txt', type="sh")
    # [1] "'foo/bar.txt'"
    shQuote('foo\bar.txt', type="cmd")
    # [1] "\"foo\bar.txt\""

Package base version 6.1.5-18
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