diff options
Diffstat (limited to 'Doc/Zsh')
| -rw-r--r-- | Doc/Zsh/options.yo | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/Doc/Zsh/options.yo b/Doc/Zsh/options.yo index 70092d681..36bd939ad 100644 --- a/Doc/Zsh/options.yo +++ b/Doc/Zsh/options.yo @@ -2193,16 +2193,16 @@ cindex(discarding embedded nulls in $'...') cindex(embedded nulls, in $'...') cindex(nulls, embedded in $'...') item(tt(POSIX_STRINGS) <K> <S>)( -This option affects processing of quoted strings. Currently it only -affects the behaviour of null characters, i.e. character 0 in the -portable character set corresponding to US ASCII. +This option affects processing of quoted strings, and also +splitting of strngs. -When this option is not set, null characters embedded within strings -of the form tt($')var(...)tt(') are treated as ordinary characters. The -entire string is maintained within the shell and output to files where -necessary, although owing to restrictions of the library interface -the string is truncated at the null character in file names, environment -variables, or in arguments to external programs. +When this option is not set, null characters (character 0 in the +portable character set coresponding to US ASCII) that are embedded +within strings of the form tt($')var(...)tt(') are treated as ordinary +characters. The entire string is maintained within the shell and output +to files where necessary, although owing to restrictions of the library +interface the string is truncated at the null character in file names, +environment variables, or in arguments to external programs. When this option is set, the tt($')var(...)tt(') expression is truncated at the null character. Note that remaining parts of the same string @@ -2211,6 +2211,18 @@ beyond the termination of the quotes are not truncated. For example, the command line argument tt(a$'b\0c'd) is treated with the option off as the characters tt(a), tt(b), null, tt(c), tt(d), and with the option on as the characters tt(a), tt(b), tt(d). + +Furthermore, when the option is set, a trailing separator followed by an +empty strings does not cause extra fields to be produced when the string +is split. For example, + +example(var="foo bar " +print -l "${=var}") + +outputs a blank line at the end if tt(POSIXSTRINGS) is not set, but +no blank line if the option is set. Note that empty elements would in +any case be removed if quotation marks were not used. If the separator +is not white space, only the final separator is ignored in this fashion. ) pindex(POSIX_TRAPS) pindex(NO_POSIX_TRAPS) |