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某同事喜用ZSH，ZSH有一个auto_cd选项，打开它之后，如果命令行是一个目录，则进入该目录。例如
.. 进入上层目录，/etc 进入/etc目录。这样省得敲"cd"了。
结合ZSH的auto_pushd功能，可以很方便地在最近使用的目录中跳来跳去。
BASH有pushd/popd/dirs，但用起来总不如ZSH那么便捷。我给BASH加上了这个auto_cd功能，用 shopt -s auto_cd 开启之后，和ZSH效果一样。源代码改动如下：
--- bash-3.2.orig/execute_cmd.c 2006-08-26 00:23:16.000000000 -0400+++ bash-3.2/execute_cmd.c 2008-05-12 16:21:44.000000000 -0400@@ -3641,11 +3641,32 @@ command = search_for_command (pathname); + int no_symlinks = 0;+ extern int auto_cd; if (command) { + if (auto_cd) + { + struct stat finfo;+ if ((stat (command, &finfo) == 0) && (S_ISDIR (finfo.st_mode)))+ { + if (change_to_directory (pathname, no_symlinks))+ { + bindpwd (no_symlinks);+ return;+ }+ }+ }+ maybe_make_export_env (); put_command_name_into_env (command); }+ else if (auto_cd && change_to_directory (pathname, no_symlinks))+ { + bindpwd (no_symlinks);+ return;+ }+ /* We have to make the child before we check for the non-existence of COMMAND, since we want the error messages to be redirected. */
--- bash-3.2.orig/builtins/cd.def 2006-07-27 21:35:36.000000000 -0400+++ bash-3.2/builtins/cd.def 2008-05-12 16:14:02.000000000 -0400@@ -58,16 +58,18 @@ extern int array_needs_making; extern char *bash_getcwd_errstr; -static int bindpwd __P((int));+int bindpwd __P((int)); static void setpwd __P((char *)); static char *resetpwd __P((char *));-static int change_to_directory __P((char *, int));+int change_to_directory __P((char *, int)); static char *cdspell __P((char *)); /* Change this to 1 to get cd spelling correction by default. */ int cdspelling = 0; +int auto_cd = 0;+ int cdable_vars; $BUILTIN cd@@ -103,7 +105,7 @@ } } -static int+int bindpwd (no_symlinks) int no_symlinks; { @@ -395,7 +397,7 @@ getcwd() will eventually be called), or set to a string corresponding to the working directory. Return 1 on success, 0 on failure. */ -static int+int change_to_directory (newdir, nolinks) char *newdir; int nolinks;
--- bash-3.2.orig/builtins/shopt.def 2005-02-19 17:25:02.000000000 -0500+++ bash-3.2/builtins/shopt.def 2008-05-12 16:13:32.000000000 -0400@@ -68,6 +68,7 @@ extern int hup_on_exit; extern int xpg_echo; extern int gnu_error_format;+extern int auto_cd; #if defined (EXTENDED_GLOB) extern int extended_glob;@@ -114,6 +115,7 @@ int *value; shopt_set_func_t *set_func; } shopt_vars[] = { + { "auto_cd", &auto_cd, (shopt_set_func_t *)NULL }, { "cdable_vars", &cdable_vars, (shopt_set_func_t *)NULL }, { "cdspell", &cdspelling, (shopt_set_func_t *)NULL }, { "checkhash", &check_hashed_filenames, (shopt_set_func_t *)NULL },@@ -253,6 +255,7 @@ cdable_vars = mail_warning = 0; no_exit_on_failed_exec = print_shift_error = 0; check_hashed_filenames = cdspelling = expand_aliases = check_window_size = 0;+ auto_cd = 0; source_uses_path = promptvars = 1;
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