diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | Doc/Zsh/builtins.yo | 17 |
2 files changed, 22 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index f7f8b218e..19a4d21f2 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2016-01-30 Daniel Shahaf <d.s@daniel.shahaf.name> + + * 37831: Doc/Zsh/builtins.yo: typeset: Document exit status + difference from parameter assignment statements + 2016-01-30 Jun-ichi Takimoto <takimoto-j@kba.biglobe.ne.jp> * 37838: Src/Builtins/rlimits.c, Src/Builtins/sched.c, diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo index fb630a713..cdf405b13 100644 --- a/Doc/Zsh/builtins.yo +++ b/Doc/Zsh/builtins.yo @@ -1826,6 +1826,23 @@ reserved word interface for tt(typeset) may cause problems with the output of `tt(typeset -p)', which assumes the reserved word interface is available in order to restore array and associative array values. +Unlike parameter assignment statements, tt(typeset)'s exit status on an +assignment that involves a command substitution does not reflect the exit +status of the command substitution. Therefore, to test for an error in +a command substitution, separate the declaration of the parameter from its +initialization: + +example(# WRONG +typeset var1=$(exit 1) || echo "Trouble with var1" + +# RIGHT +typeset var1 && var1=$(exit 1) || echo "Trouble with var1" +) + +To initialize a parameter var(param) to a command output and mark it readonly, +use tt(typeset -r )var(param) or tt(readonly )var(param) after the parameter +assignment statement. + If the shell option tt(TYPESET_SILENT) is not set, for each remaining var(name) that refers to a parameter that is already set, the name and value of the parameter are printed in the form of an assignment. |