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Diffstat (limited to 'Doc/Zsh/builtins.yo')
| -rw-r--r-- | Doc/Zsh/builtins.yo | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo index 51802f1d6..a1e9df79a 100644 --- a/Doc/Zsh/builtins.yo +++ b/Doc/Zsh/builtins.yo @@ -626,6 +626,14 @@ var(sig) that is a name, the corresponding signal number is listed. For each var(sig) that is a signal number or a number representing the exit status of a process which was terminated or stopped by a signal the name of the signal is printed. + +On some systems, alternative signal names are allowed for a few signals. +Typical examples are tt(SIGCHLD) and tt(SIGCLD) or tt(SIGPOLL) and +tt(SIGIO), assuming they correspond to the same signal number. tt(kill +-l) will only list the preferred form, however tt(kill -l) var(alt) will +show if the alternative form corresponds to a signal number. For example, +under Linux tt(kill -l IO) and tt(kill -l POLL) both output 29, hence +tt(kill -IO) and tt(kill -POLL) have the same effect. ) findex(let) item(tt(let) var(arg) ...)( @@ -1179,6 +1187,11 @@ will print the line number of a command executed after it has run, while example(TRAPDEBUG() { print $LINENO; }) will always print the number zero. + +Alternative signal names are allowed as described under tt(kill) above. +Defining a trap under either name causes any trap under an alternative +name to be removed. However, it is recommended that for consistency +users stick exclusively to one name or another. ) findex(true) cindex(doing nothing, successfully) |