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author | Jari Aalto <jari.aalto@cante.net> | 2001-04-06 19:14:31 +0000 |
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committer | Jari Aalto <jari.aalto@cante.net> | 2009-09-12 16:46:53 +0000 |
commit | 28ef6c316f1aff914bb95ac09787a3c83c1815fd (patch) | |
tree | 2812fe7ffc9beec4f99856906ddfcafda54cf16a /COMPAT | |
parent | bb70624e964126b7ac4ff085ba163a9c35ffa18f (diff) | |
download | android_external_bash-28ef6c316f1aff914bb95ac09787a3c83c1815fd.tar.gz android_external_bash-28ef6c316f1aff914bb95ac09787a3c83c1815fd.tar.bz2 android_external_bash-28ef6c316f1aff914bb95ac09787a3c83c1815fd.zip |
Imported from ../bash-2.05.tar.gz.
Diffstat (limited to 'COMPAT')
-rw-r--r-- | COMPAT | 69 |
1 files changed, 68 insertions, 1 deletions
@@ -1,5 +1,5 @@ This document details the incompatibilites between this version of bash, -bash-2.04, and the previous widely-available version, bash-1.14 (which +bash-2.05, and the previous widely-available version, bash-1.14 (which is still the `standard' version for many Linux distributions). These were discovered by users of bash-2.x, so this list is not comprehensive. @@ -131,3 +131,70 @@ were discovered by users of bash-2.x, so this list is not comprehensive. that declares them: alias -x='chmod a-x' --> alias -- -x='chmod a-x' + +13. There was a bug in bash-1.14 and previous versions that caused it to + accept as valid syntax for loops of the form + + for f in ; do ... ; done + + This should be a syntax error, and bash-2.x treats it as such. + +14. The behavior of range specificiers within bracket matching expressions + in the pattern matcher (e.g., [A-Z]) depends on the current locale, + specifically the value of the LC_COLLATE environment variable. Setting + this variable to C or POSIX will result in the traditional ASCII behavior + for range comparisons. If the locale is set to something else, e.g., + en_US (specified by the LANG or LC_ALL variables), collation order is + locale-dependent. For example, the en_US locale sorts the upper and + lower case letters like this: + + AaBb...Zz + + so a range specification like [A-Z] will match every letter except `z'. + + The portable way to specify upper case letters is [:upper:] instead of + A-Z; lower case may be specified as [:lower:] instead of a-z. + + Look at the manual pages for setlocale(3), strcoll(3), and, if it is + present, locale(1). + + You can find your current locale information by running locale(1): + + caleb.ins.cwru.edu(2)$ locale + LANG=en_US + LC_CTYPE="en_US" + LC_NUMERIC="en_US" + LC_TIME="en_US" + LC_COLLATE="en_US" + LC_MONETARY="en_US" + LC_MESSAGES="en_US" + LC_ALL=en_US + + My advice is to put + + export LC_COLLATE=C + + into /etc/profile and inspect any shell scripts run from cron for + constructs like [A-Z]. This will prevent things like + + rm [A-Z]* + + from removing every file in the current directory except those beginning + with `z' and still allow individual users to change the collation order. + Users may put the above command into their own profiles as well, of course. + +15. Bash versions up to 1.14.7 included an undocumented `-l' operator to + the `test/[' builtin. It was a unary operator that expanded to the + length of its string argument. This let you do things like + + test -l $variable -lt 20 + + for example. + + This was included for backwards compatibility with old versions of the + Bourne shell, which did not provide an easy way to obtain the length of + the value of a shell variable. + + This operator is not part of the POSIX standard, because one can (and + should) use ${#variable} to get the length of a variable's value. + Bash-2.x does not support it. |