diff options
Diffstat (limited to 'Etc/FAQ.yo')
| -rw-r--r-- | Etc/FAQ.yo | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/Etc/FAQ.yo b/Etc/FAQ.yo index 4a86050e6..4d71c8f30 100644 --- a/Etc/FAQ.yo +++ b/Etc/FAQ.yo @@ -1091,20 +1091,23 @@ sect(Comparisons of forking and non-forking command substitution) mytt(set -- pos1 pos2 etc). Nothing that happens within mytt($(command)) affects the caller. - mytt($(command)) removes trailing newlines from the output of mytt(command) - when substituting, whereas mytt(${ command }) and its variants do not. - The latter is consistent with mytt(${|...}) from mksh but differs from - bash and ksh, so in emulation modes, newlines are stripped from command - output (not from tt(REPLY) assignments). - When not enclosed in double quotes, the expansion of mytt($(command)) is split on tt(IFS) into an array of words. In contrast, and unlike both bash and ksh, unquoted non-forking substitutions behave like parameter expansions with respect to the tt(SH_WORD_SPLIT) option. - When mytt(command) is myem(not) a builtin, mytt(${ command }) does fork, and - typically forks the same number of times as mytt($(command)), because in - the latter case zsh usually optimizes the final fork into an exec. + Both of the mytt(${|...}) formats retain any trailing newlines, + except as handled by the tt(SH_WORD_SPLIT) option, consistent with + mytt(${|...}) from mksh. mytt(${ command }) removes a single final + newline, but mytt("${ command }") retains it. This differs from + bash and ksh, so in emulation modes, newlines are stripped even from + quoted command output. In all cases, mytt($(command)) removes all + trailing newlines from the output of mytt(command). + + When mytt(command) is myem(not) a builtin, mytt(${ command }) does + fork, and typically forks the same number of times as + mytt($(command)), because in the latter case zsh usually optimizes + the final fork into an exec. Redirecting input from files has subtle differences: itemization( |