diff options
Diffstat (limited to 'COMPAT')
| -rw-r--r-- | COMPAT | 48 |
1 files changed, 36 insertions, 12 deletions
@@ -295,7 +295,8 @@ version and versions 2.0 and above. 37. Bash-4.0 now allows SIGCHLD to interrupt the wait builtin, as Posix specifies, so the SIGCHLD trap is no longer always invoked once per - exiting child if you are using `wait' to wait for all children. + exiting child if you are using `wait' to wait for all children. As + of bash-4.2, this is the status quo only when in posix mode. 38. Since bash-4.0 now follows Posix rules for finding the closing delimiter of a $() command substitution, it will not behave as previous versions @@ -330,35 +331,58 @@ version and versions 2.0 and above. 44. Bash-4.1 uses the current locale when comparing strings using the < and > operators to the `[[' command. This can be reverted to the previous - behavior by setting one of the `compatNN' shopt options. + behavior (ASCII collating and strcmp(3)) by setting one of the + `compatNN' shopt options, where NN is less than 41. + +45. Command substitutions now remove the caller's trap strings when trap is + run to set a new trap in the subshell. Previous to bash-4.2, the old + trap strings persisted even though the actual signal handlers were reset. + +46. When in Posix mode, a single quote is not treated specially in a + double-quoted ${...} expansion, unless the expansion operator is + # or % or the new `//', `^', or `,' expansions. In particular, it + does not define a new quoting context. This is from Posix interpretation + 221. + +47. Posix mode shells no longer exit if a variable assignment error occurs + with an assignment preceding a command that is not a special builtin. + Shell Compatibility Level ========================= Bash-4.0 introduced the concept of a `shell compatibility level', specified -as a set of options to the shopt builtin (compat31, compat32, compat40 at -this writing). There is only one current compatibility level -- each -option is mutually exclusive. This list does not mention behavior that is -standard for a particular version (e.g., setting compat32 means that quoting -the rhs of the regexp matching operator quotes special regexp characters in -the word, which is default behavior in bash-3.2 and above). +as a set of options to the shopt builtin (compat31, compat32, compat40, and +compat41 at this writing). There is only one current compatibility level -- +each option is mutually exclusive. This list does not mention behavior +that is standard for a particular version (e.g., setting compat32 means that +quoting the rhs of the regexp matching operator quotes special regexp +characters in the word, which is default behavior in bash-3.2 and above). compat31 set - the < and > operators to the [[ command do not consider the current - locale when comparing strings + locale when comparing strings; they use ASCII ordering - quoting the rhs of the regexp matching operator (=~) has no special effect compat32 set - the < and > operators to the [[ command do not consider the current - locale when comparing strings + locale when comparing strings; they use ASCII ordering compat40 set - the < and > operators to the [[ command do not consider the current - locale when comparing strings + locale when comparing strings; they use ASCII ordering - interrupting a command list such as "a ; b ; c" causes the execution - of the entire list to be aborted + of the entire list to be aborted (in versions before bash-4.0, + interrupting one command in a list caused the next to be executed) +compat41 set + - interrupting a command list such as "a ; b ; c" causes the execution + of the entire list to be aborted (in versions before bash-4.0, + interrupting one command in a list caused the next to be executed) + - when in posix mode, single quotes in the `word' portion of a + double-quoted parameter expansion define a new quoting context and + are treated specially ------------------------------------------------------------------------------- Copying and distribution of this file, with or without modification, |