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1 files changed, 105 insertions, 95 deletions
diff --git a/Etc/FAQ.yo b/Etc/FAQ.yo index 49f822483..9e376ca7a 100644 --- a/Etc/FAQ.yo +++ b/Etc/FAQ.yo @@ -43,21 +43,20 @@ whenlatex(report(ARG1)(ARG2)(ARG3))\ whenman(report(ARG1)(ARG2)(ARG3))\ whenms(report(ARG1)(ARG2)(ARG3))\ whensgml(report(ARG1)(ARG2)(ARG3))) -myreport(Z-Shell Frequently-Asked Questions)(Peter Stephenson)(2001/03/04) +myreport(Z-Shell Frequently-Asked Questions)(Peter Stephenson)(2001/05/25) COMMENT(-- the following are for Usenet and must appear first)\ description(\ mydit(Archive-Name:) unix-faq/shell/zsh -mydit(Last-Modified:) 2001/03/04 +mydit(Last-Modified:) 2001/05/24 mydit(Submitted-By:) email(pws@pwstephenson.fsnet.co.uk (Peter Stephenson)) mydit(Posting-Frequency:) Monthly mydit(Copyright:) (C) P.W. Stephenson, 1995--2001 (see end of document) ) -bf(Changes since issue posted January 2001:) +bf(Changes since last issue posted:) description( - mydit(3.26) New item: effect of multios on pipes. - mydit(5.3) Add parameter code changes to wishlist. - mydit(5.4) Rewrite for historical reasons. + mydit() Nothing substantive, but many minor tweaks in preparation for + the release of 4.0.1. ) This document contains a list of frequently-asked (or otherwise @@ -240,16 +239,16 @@ sect(What is it good at?) itemize( it() Command line editing: itemize( - it() programmable completion: incorporates the ability to use - the full power of zsh globbing (compctl -g), + it() programmable completion: incorporates the ability to use the + full power of zsh's globbing and shell programming features, it() multi-line commands editable as a single buffer (even files!), it() variable editing (vared), it() command buffer stack, it() print text straight into the buffer for immediate editing (print -z), it() execution of unbound commands, - it() menu completion, + it() menu completion in two flavours, it() variable, editing function and option name completion, - it() inline expansion of variables, history commands. + it() inline expansion of variables and history commands. ) it() Globbing --- extremely powerful, including: itemize( @@ -263,8 +262,9 @@ sect(What is it good at?) it() Adaptable messages for spelling, watch, time as well as prompt (including conditional expressions). it() Named directories. - it() Comprehensive integer arithmetic. + it() Comprehensive integer and floating point arithmetic. it() Manipulation of arrays (including reverse subscripting). + it() Associative arrays (key-to-value hashes) it() Spelling correction. ) @@ -299,21 +299,23 @@ sect(On what machines will it run?) sect(What's the latest version?) - Zsh 3.0.8 is the latest production version. The new major number 3.0 - largely reflects the considerable internal changes in zsh to make it more + Zsh 4.0.1 is the latest production version. + + Zsh 3.0.8 was the previous production version. The major number 3.0 + largely reflected considerable internal changes in zsh to make it more reliable, consistent and (where possible) compatible. Those planning on upgrading their zsh installation should take a look at the list of incompatibilities at the end of link(5.1)(51). This is longer than usual due to enhanced sh, ksh and POSIX compatibility. - It is unlikely that there will be more 3.0 releases before 4.0 becomes + There will not be any further 3.0 releases now that 4.0 has become the stable version. However, a few patches to 3.0.8 are available from the patch manager at Sourceforge, \ url(http://sourceforge.net/patch/?group_id=4068)\ (http://www.sourceforge.net/patch/?group_id=4068) Official patches are posted by Bart Schaefer (user name tt(barts)). - The beta version 3.1.9 is also available. Development of zsh is usually + A beta of the next version is often available. Development of zsh is patch by patch, with each intermediate version publicly available. Note that this `open' development system does mean bugs are sometimes introduced into the most recent archived version. These are usually @@ -327,7 +329,7 @@ url(http://sourceforge.net/patch/?group_id=4068)\ Changes of this kind are almost always forced by an awkward or unnecessary feature in the original design (as perceived by current users), or to enhance compatibility with other Bourne shell - derivatives, or (most recently) to provide POSIX compliancy. + derivatives, or (mostly in the 3.0 series) to provide POSIX compliancy. sect(Where do I get it?) @@ -366,11 +368,11 @@ label(16) mydit() url(ftp://ftp.kfki.hu/pub/packages/zsh/) (ftp://ftp.kfki.hu/pub/packages/zsh/) mydit(Israel) \ -url(ftp://ftp.math.technion.ac.il/mirror/ftp.zsh.org/pub/zsh/) -(ftp://ftp.math.technion.ac.il/mirror/ftp.zsh.org/pub/zsh/) +url(ftp://ftp.math.technion.ac.il/pub/zsh/) +(ftp://ftp.math.technion.ac.il/pub/zsh/) mydit() \ -url(http://www.math.technion.ac.il/mirror/ftp.zsh.org/pub/zsh/) -(http://www.math.technion.ac.il/mirror/ftp.zsh.org/pub/zsh/) +url(http://www.math.technion.ac.il/pub/zsh/) +(http://www.math.technion.ac.il/pub/zsh/) mydit(Italy) url(ftp://ftp.unina.it/pub/Unix/pkgs/shell/zsh/) (ftp://ftp.unina.it/pub/Unix/pkgs/shell/zsh/) mydit(Japan) url(ftp://ftp.nisiq.net/pub/shells/zsh/) @@ -406,15 +408,15 @@ url(http://www.math.technion.ac.il/mirror/ftp.zsh.org/pub/zsh/) The Windows port mentioned above is maintained separately by email(Amol Deshpande <amold@microsoft.com>); please mail Amol directly about any - Windows-specific problems. This is quite new, so don't expect it to - be perfect. You can get it from: + Windows-specific problems. This is based on 3.0.5, and probably will + not be developed further. You can get it from: description( mydit() url(ftp://ftp.blarg.net/users/amol/zsh) (ftp://ftp.blarg.net/users/amol/zsh) ) - There is no port of 3.1 for Windows, but newer releases compile under + There is no port of 4.0 for Windows, but newer releases compile under Cygwin, a freely available UNIX-style environment for the Win32 API. You can find information about this at url(http://sourceware.cygnus.com/cygwin)\ @@ -539,31 +541,33 @@ label(21) myeit() also from 3.0, the command `emulate' is available: `emulate ksh' and `emulate sh' set various options as well as changing the effect of single-letter option flags as if the shell had been - invoked with the appropriate name. Including the commands + invoked with the appropriate name. Including the command `emulate sh; setopt localoptions' in a shell function will - turn on sh emulation for that function only. + turn on sh emulation for that function only. In 4.0 (and in + 3.0.6 through 8), this can be abbreviated as `emulate -L sh'. ) - The classic difference is word splitting, discussed in link(3.1)(31); this - catches out very many beginning zsh users. As explained there, this - is actually a bug in every other shell. The answer is to set + The classic difference is word splitting, discussed in question \ +link(3.1)(31); + this catches out very many beginning zsh users. As explained there, + this is actually a bug in every other shell. The answer is to set tt(SH_WORD_SPLIT) for backward compatibility. The next most classic - difference is that unmatched glob patterns cause the command to - abort; set tt(NO_NOMATCH) for those. + difference is that unmatched glob patterns cause the command to abort; + set tt(NO_NOMATCH) for those. Here is a list of various options which will increase ksh compatibility, though maybe decrease zsh's abilities: see the manual entries for tt(GLOB_SUBST), tt(IGNORE_BRACES) (though brace expansion occurs in some versions of ksh), tt(KSH_ARRAYS), tt(KSH_GLOB), tt(KSH_OPTION_PRINT), tt(LOCAL_OPTIONS), tt(NO_BAD_PATTERN), tt(NO_BANG_HIST), tt(NO_EQUALS), \ -tt(NO_HUP,) +tt(NO_HUP), tt(NO_NOMATCH), tt(NO_RCS), tt(NO_SHORT_LOOPS), tt(PROMPT_SUBST), \ tt(RM_STAR_SILENT), tt(POSIX_BUILTINS), tt(SH_FILE_EXPANSION), tt(SH_GLOB), \ tt(SH_OPTION_LETTERS), tt(SH_WORD_SPLIT) (see question link(3.1)(31)) and tt(SINGLE_LINE_ZLE). Note that you can also disable any built-in commands which get in - your way. If invoked as `ksh', the shell will try and set suitable + your way. If invoked as `ksh', the shell will try to set suitable options. Here are some differences from ksh which might prove significant for @@ -602,8 +606,8 @@ PROMPT_SUBST). Equivalents: verb( ---------------------------------------------------------------------- - ksh zsh Meaning - ----- ----- --------- + ksh zsh Meaning + ------ ------ --------- !(foo) ^foo Anything but foo. or foo1~foo2 Anything matching foo1 but foo2[1]. @(foo1|foo2|...) (foo1|foo2|...) One of foo1 or foo2 or ... @@ -656,6 +660,10 @@ link(2.3)(23). it()* Options are not local to functions (use LOCAL_OPTIONS; note this may always be unset locally to propagate options settings from a function to the calling level). + it() Functions defined with `function funcname { body }' behave the + same way as those defined with `funcname () { body }'. In ksh, + the former behave as if the body were read from a file with `.', + and only the latter behave as true functions. ) it() Traps and signals: itemize( @@ -673,7 +681,7 @@ link(2.3)(23). it() The mytt(keyword) option does not exist and mytt(-k) is instead interactivecomments. (mytt(keyword) will not be in the next ksh release either.) - it() Management of histories in multiple shells is different: + it()* Management of histories in multiple shells is different: the history list is not saved and restored after each command. The option tt(SHARE_HISTORY) appeared in 3.1.6 and is set in ksh compatibility mode to remedy this. @@ -852,13 +860,13 @@ sect(Similarities with tcsh) (The sections on csh apply too, of course.) Certain features have been borrowed from tcsh, including tt($watch), tt(run-help), tt($savehist), - tt($histlit), periodic commands etc., extended prompts, tt(sched) - and tt(which) built-ins. Programmable completion was inspired by, - but is entirely different to, tcsh's mytt(complete). (There is a perl - script called tt(lete2ctl) in the Misc directory of the source - distribution to convert mytt(complete) to mytt(compctl) statements.) - This list is not definitive: some features have gone in the other - direction. + periodic commands etc., extended prompts, tt(sched) and tt(which) built-ins. + Programmable completion was inspired by, but is entirely different to, + tcsh's mytt(complete). (There is a perl script called tt(lete2ctl) in the + Misc directory of the source distribution to convert mytt(complete) to \ +mytt(compctl) + statements.) This list is not definitive: some features have gone in + the other direction. If you're missing the editor function tt(run-fg-editor), try something with mytt(bindkey -s) (which binds a string to a keystroke), e.g. @@ -879,8 +887,8 @@ sect(Similarities with tcsh) verb( bindkey '\eq' push-input ) - to save the entire buffer. In recent versions of zsh 3.1, you have - the following more sophisticated option, + to save the entire buffer. In 4.0 and recent versions of zsh 3.1, you + have the following more sophisticated option, verb( run-fg-editor() { zle push-input @@ -903,7 +911,7 @@ sect(Similarities with bash) interactive features (programmable completion, etc.) that zsh has. In recent years there has been a certain amount of crossover in the - extensions, however. Zsh now (3.1.6) has bash's `tt(${var/old/new})' + extensions, however. Zsh (as of 3.1.6) has bash's `tt(${var/old/new})' feature for replacing the text tt(old) with the text tt(new) in the parameter tt($var). Note one difference here: while both shells implement the syntax `tt(${var/#old/new})' and `tt(${var/%old/new})' for @@ -1059,7 +1067,7 @@ sect(In which startup file do I put...?) you use the tt(-f) option) is tt(.zshenv), so this is a good place to \ put things you want even if the shell is non-interactive: options for - changing the the syntax, like tt(EXTENDED_GLOB), any changes to set with + changing the syntax, like tt(EXTENDED_GLOB), any changes to set with mytt(limit), any more variables you want to make sure are set as for example tt($fpath) to find functions. You almost certainly do not want tt(.zshenv) to produce any output. Some people prefer not to @@ -1213,7 +1221,9 @@ sect(Why do the cursor (arrow) keys not work?) ) If you use vi mode, use mytt(vi-backward-char) and mytt(vi-forward-char) - where appropriate. + where appropriate. As of version 4.0.1, zsh attempts to look up these + codes and to set the key bindings for you (both emacs and vi), but in + some circumstances this may not work. Note, however, that up to version 3.0 binding arbitrary multiple key sequences can cause problems, so check that this works with your set @@ -1284,10 +1294,9 @@ sect(Why does my terminal act funny in some way?) ttyctl -u STTY='lnext "^-"' commandname ) - (in this example), or just export STTY for all commands to see. Note - that zsh doesn't reset the terminal completely afterwards: just the - modes it uses itself and a number of special processing characters - (see the tt(stty(1)) manual page). + (in this example). Note that zsh doesn't reset the terminal completely + afterwards: just the modes it uses itself and a number of special + processing characters (see the tt(stty(1)) manual page). sect(Why does zsh not work in an Emacs shell mode any more?) @@ -1423,8 +1432,8 @@ label(313) mytt(unsetopt cshjunkiequotes) and mytt(setopt cshjunkiequotes), or put it in your tt(.zshrc) before the option is set. - In all recent versions of zsh, there is a form of quoting which will - interpret print sequences like `tt(\n)' but otherwise acts like single + In recent versions of zsh (not 3.0), there is a form of quoting which + interprets print sequences like `tt(\n)' but otherwise acts like single quotes: surround the string with tt($'...'). Hence: verb( PROMPT=$'Hi Joe,\nwhat now?%# ' @@ -1600,7 +1609,7 @@ sect(How do I get a variable's value to be evaluated as another variable?) ) produces the same result. - Versions 3.1.6 of allows you to do this directly with a new flag; + Versions since 3.1.6 allow you to do this directly with a new flag; mytt(${(P)E}). As a slight aside, sometimes people note that the syntax mytt(${${E}}) @@ -1691,39 +1700,39 @@ sect(How do I get coloured prompts on my colour xterm?) sect(Why is my output duplicated with `tt(foo 2>&1 >foo.out | bar)'?) -This is a slightly unexpected effect of the option tt(MULTIOS), which is -set by default. Let's look more closely: -verb( - foo 2>&1 >foo.out | bar -) -What you're probably expecting is that the command mytt(foo) sends its -standadrd output to the pipe and so to the input of the command mytt(bar), -while it sends its standard error to the file mytt(foo.out). What you -actually see is that the output is going both to the pipe and into the file. -To be more explicit, here's the same example with real commands: -verb( - % { print output; print error >&2 } 2>&1 >foo.out | sed 's/error/erratic' - erratic - output - % cat foo.out - output -) -and you can see `tt(output)' appears twice. - -It becomes clearer what's going on if we write: -verb( - % print output >foo1.out >foo2.out - % cat foo1.out - output - % cat foo2.out - output -) -You might recognise this as a standard feature of zsh, called `tt(multios)' -and controlled by the option of the same name, whereby output is copied to -both files when the redirector appears twice. What's going on in the first -example is exactly the same, however the second redirector is disguised as -a pipe. So if you want to turn this effect off, you need to unset the -option mytt(MULTIOS). + This is a slightly unexpected effect of the option tt(MULTIOS), which is + set by default. Let's look more closely: + verb( + foo 2>&1 >foo.out | bar + ) + What you're probably expecting is that the command mytt(foo) sends its + standard output to the pipe and so to the input of the command mytt(bar), + while it sends its standard error to the file mytt(foo.out). What you + actually see is that the output is going both to the pipe and into the + file. To be more explicit, here's the same example with real commands: + verb( + % { print output; print error >&2 } 2>&1 >foo.out | sed 's/error/erratic' + erratic + output + % cat foo.out + output + ) + and you can see `tt(output)' appears twice. + + It becomes clearer what's going on if we write: + verb( + % print output >foo1.out >foo2.out + % cat foo1.out + output + % cat foo2.out + output + ) + You might recognise this as a standard feature of zsh, called `tt(multios)' + and controlled by the option of the same name, whereby output is copied + to both files when the redirector appears twice. What's going on in the + first example is exactly the same, however the second redirector is + disguised as a pipe. So if you want to turn this effect off, you need + to unset the option mytt(MULTIOS). chapter(The mysteries of completion) @@ -2059,9 +2068,10 @@ this applies with more detail. itemize( + it() Parameter expansions using the tt(${param+word}) and tt(${param-word}) + forms may fail to behave in Bourne-shell-compatible fashion when the + tt(SH_WORD_SPLIT) option is set and the word contains spaces. it() mytt(time) is ignored with builtins and can't be used with mytt({...}). - it() When showing completion lists with exactly 80 columns, some - terminals print an extra newline which messes up zsh's logic. it() mytt(set -x) (mytt(setopt xtrace)) still has a few glitches; these are mostly fixed in 3.1.6. it() Zsh's notion of the current line number (via tt($LINENO)) is @@ -2078,18 +2088,18 @@ this applies verb( [[ fofo = (fo#)# ]] ) - were not correctly handled, and there were problems with - complicated exclusions using mytt(^) or mytt(~). These - are fixed in version 3.1.3. + were once not correctly handled, and there were problems with + complicated exclusions using mytt(^) or mytt(~). These are fixed + since version 3.1.3. ) it() Handling of the mytt(:q) and mytt(:x) with parameter subsitutions is - erratic: neither work in any 3.0 release, and tt(:x) doesn't work in - any release so far. + erratic: neither work in any 3.0 release, and tt(:x) doesn't work in + any release so far. Note that a few recent changes introduce incompatibilities (these are not bugs): - Changes after zsh 3.0 (3.1.x is still currently in beta): + Changes after zsh 3.0: itemize( it() The options tt(ALWAYS_LAST_PROMPT) (return to the line you were editing after displaying completion lists) and tt(LIST_AMBIGUOUS) |